Perfect Form Formwork Meets Challenges of Towering Bridge Project Pg 21

INSIDE: CONCRETE SURFACES March 2016

An Ofﬁ cial Magazine of World of Concrete

Perfect Form Formwork meets challenges of towering bridge project pg 21

Rebuilt section of highway in Utah wins 2016 Triad Award pg 29

How-to Zone: Curing concrete ﬂ atwork pg 56

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FEATURES DEPARTMENTS CS-39 News & Views 21 Tall Towers Carry High Hopes 7 Insider Information It’s a miracle clients ever Expert planning and construction helps Concrete Fundamentals, Infrastructure Challenges, get the polished concrete crews on the East End Crossing Bridge and Staining for Success. ﬂoor that they envision. spanning the Ohio River. 13 Your Business CS-41 Decorative Concrete 29 Elevating Concrete Pavement Design Contractor to Watch, bauma, Quick Poll, and More. The best way to improve The clock was ticking for all involved in our 18 Uncommon Sense your acid-staining winning 2016 Triad Award project. See the A Top 10 in Concrete technique. winner and the runners-up. 56 How to Zone CS-45 Showcase: Charley’s Curing Concrete Flatwork Concrete Lazy River Exquisite, hand-crafted, lazy river scene on a ONLINE polished concrete ﬂoor. Visit www.concreteconstruction.net CS-49 Feature: for bonus material, including… ASCC Decorative Concrete Construction Products Concrete Council’s Power trowels Top Honor: Wow! Projects Florida Polytechnic Three new projects exemplify the best in concrete: University’s Innovation, IN THE NEXT ISSUE OF San Diego Airport Rental Car Center, Panorama Tower Science, and Technology CONCRETE in Miami, and Lost Creek Dam in La Porte, Calif. Building earns two Site Prep for Concrete Construction awards, including the CONSTRUCTION Sponsored by Caterpillar WOW! grand prize.

• Increasing Productivity with Prefab Bar Mats COVER: Forming surrounds the East End Crossing • Understanding the ACI 562 Repair Code Bridge’s concrete towers over the Ohio River. • Products: Screeds CREDIT: PERI FORMWORK SYSTEMS

CONCRETE CONSTRUCTION (ISSN1533-7316) is published 7 times per year (January/February, March, May/June, July/August, September, October, November/December) and is copyrighted ©2016 by Hanley Wood, One Thomas Circle NW, Suite 600, Washington, DC 20005. Postmaster: Send address changes to CONCRETE CONSTRUCTION, PO Box 3494, Northbrook, IL 60065 Canada Post Registration #40612608/G.S.T. number: R-120931738. Canadian return address: IMEX, PO Box 25542, London, ON N6C 6B2.

INSIDER INFORMATION

Concrete is Fundamental

Most of the books published by the American Concrete Institute are anything but fundamental — highly technical, in-depth advice is what sets ACI apart. But there’s also a place for the basics and two new publications ﬁll that need. The Concrete William D. Palmer Jr. Craftsman Series of books started more than 30 years ago and now there’s one brand Editor in Chief new one, Placing and Finishing Decorative Concrete Flatwork (CCS-5), and an updated [email protected] version of Concrete Fundamentals (CCS-0). Both have nice color photography and are Twitter: @wmpalmer organized to help those who want to understand the basics and don’t really need all the details.

Infrastructure Challenges “I don’t think it’s any secret that we have challenges in regard to aging infrastructure,” said Kryton CEO Kari Yuers in an interview at CC Live during the World of Concrete. This in-depth discussion, available now on video, explores the frustration of politicians pledging money during elections and then not delivering and looks at why some spending is more effective. “If the system isn’t in place to get the money to where it needs to be, then we’re not going to get it built,” she said. “And we have aging infrastructure which is a safety issue and a cost issue because everything escalates and then it’s not a maintenance program — it’s a replacement program which increases the cost for everybody.” To see the full video conversation, go to bit.do/ cckrytonvideo.

AGING INFRASTRUCTURE IS A SAFETY ISSUE AND A COST ISSUE.

Staining for Success If you ever have or ever intend to acid stain a ﬂoor, you’ve got to read Steve VandeWater’s article on page CS-41. Steve is a former decorative concrete contractor who now runs his own concrete supply house in Fishers, Ind., and our regular decorative concrete columnist. He noticed that the sealer on some of his stained ﬂoors was peeling away and even taking some of the stain color with it. Since acid stains are in the surface layer of concrete, that didn’t make any sense. Check out his article for the surprisingly simple solution.

Live from WOC Whether you attended the World of Concrete this year or not, you couldn’t possibly have seen everything. From the North Hall to the South Hall, from the Silver Lot to the Gold Lot, there are exhibits and demos and contests. Luckily, we shot lots of video during the show so you can catch up on what you missed. Shelby Mitchell, one of our former editors and now a consultant, and Lauren Hunter, our videographer extraordinaire, toured the show from dawn to dusk for three days to capture a sense of WOC. To see all of the videos, go to www.concreteconstruction.net/videos.

www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 7 PUBLISHED BY HANLEY WOOD CORPORATE ® Chief Executive Offi cer | Peter Goldstone Vice Chairman | Frank Anton Chief Financial Offi cer | Matthew Flynn Group Editorial Director, Design and Commercial Construction | President/Media | Dave Colford Ned Cramer • [email protected] President/Digital | Andrew Reid President/Marketing | Jeanne Milbrath Editor in Chief, Commercial Construction | President/Metrostudy | Christopher Veator William D. Palmer Jr. • [email protected] Senior Vice President/Marketing | Sheila Harris Group Managing Editor | Tom Bagsarian • [email protected] Vice President/Corporate Accounts | Ryan Flom Community Manager | Sharon J. Rehana • [email protected] Vice President/General Counsel | Michael Bender Assistant Managing Editor | Colette Martino Palait • [email protected] Vice President/Business Planning & Analysis | Ron Kraft Group Web Producer | Jack White • [email protected] Vice President/Corporate Controller | Keith Rosenbloom Editorial Intern | Zack Zerndt • [email protected] EDITORIAL AND ADVERTISING OFFICES Senior Graphic Designer | Lita Ledesma • [email protected] 5600 N. River Road, Suite 250, Rosemont, IL 60018 Production Manager | Stephanie E. Fischer • sfi [email protected] 773-824-2400; Fax 773-824-2401 Ad Production Coordinator | Terry Rinella • [email protected] [email protected] • www.concreteconstruction.net

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8 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net

Inside/Classified Sales Business Development Manager Bob Marinez ® Phone: 440-686-1228 / Fax: 440.686.1230 [email protected] Inside/Classified Sales Business Development Manager 5600 N. River Road, Suite 250, Rosemont, IL 60018 Caroline Orr Phone: 773-824-2400 • Fax: 773-824-2401 Phone: 202-729-3566 / Fax: 202.785.1974 [email protected] [email protected] www.concreteconstruction.net www.worldofconcrete.com Inside/Classified Sales Business Development Manager Debora Reda President Phone: 773-824-2413 / Fax: 773.824.2401 [email protected] Hanley Wood Contractor Group | Rick Strachan Phone: 202-736-3332 / Fax: 202.785.1974 Sponsor Sales/Service [email protected] Chari O’Rourke-Berzanskis Phone: 773-824-2525 / Fax: 773.824.2401 Vice President, Sales-Commercial Construction [email protected] Greg Cooke Phone: 773-824-2403 / Fax: 773.824.2401 MEDIA KITS [email protected] Greg Cooke [email protected] STRATEGIC ACCOUNT MANAGERS West/Central REPRINTS AND LICENSING Greg Cooke Wright’s Media Phone: 773-824-2403 / Fax: 773.824.2401 Phone: 877-652-5295 [email protected] [email protected] East/Southwest Ed Kraft, National Sales Director, Commercial Construction LIST RENTALS Phone, Fax: 443-445-3488 Contact: Statlistics [email protected] Phone: 203-778-8700 East/West Mike Worley Phone: 773-824-2416 / Fax: 773-824-2401 [email protected] Canada D. John Magner • [email protected] Colleen T. Curran • [email protected] Phone: 416-598-0101 ext 230 / Fax: 416.598.9191 e-Media Sales Greg Cooke Phone: 773-824-2403 / Fax: 773.824.2401 [email protected]

10 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net

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CONTRACTOR TO WATCH McCarthy Building Companies Inc., St. Louis

BY ZACK ZERNDT

FOR MORE THAN 150 YEARS, McCarthy Building Companies Bolen. “It can be challenging competing on a national scale. has offered workflow solutions from preconstruction through Focusing our efforts on finding and training qualified workers completion. While McCarthy is a national builder, employees has been the key for us.” live and work in the communities they serve. The contractor McCarthy prides itself on using its own labor force is 100% employee-owned, which means employees have a to accomplish a portion of its construction project. Self- vested interest in the success of every project. performing contractors spend years developing and training CEO Michael Bolen joined the contractor in 1978 as a strong crew of professionals, while subcontractors and a formwork carpenter. Bolen became the first CEO in the brokers may not have the same opportunities or resources. company’s history without the last name McCarthy. He is McCarthy is successful in a wide variety of markets, determined to continue the company’s mission to become including healthcare, education, advanced technology, “the best builder in America.” commercial, government, hospitality, industrial, and marine. “We are proud to be the oldest self-performing general The future looks bright for McCarthy. Bolen believes contractor in America,” says Bolen. the industry will stay busy and continue to heat up. The As one of the top 10 U.S. commercial builders, McCarthy contractor is in the third year of a five-year plan to get back brings in $3 billion in annual revenue. McCarthy has 15 to where it was before the recession hit. offices with 1,700 full-time salaried and 1,200 non-salaried “In two years, we will see 20 to 25% growth of employees employees. “Concrete work tends to be a local business,” says and workforce,” says Bolen.

www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 13 YOUR BUSINESS

INDUSTRY Six Million Square Feet of Construction

On the heels of wrapping up World of Concrete in Las Vegas, now it’s time for bauma in Germany. More than 3,400 exhibitors from 57 countries will bring innovations in construction to the forefront of your business decisions at this year’s bauma. Occurring once every three years, the 31st edition of the World’s Leading Trade Fair will take place in Munich from April 11–17. Exhibitors are preparing for more than 535,000 visitors that are expected to converge at the only trade fair in the world that brings together the construction machinery industry in its entire breadth and depth. The buzz from the bauma press event in January in Munich and at an early press preview in New York last fall is that the show will have everything related to construction, building-material, and mining machines as well as construction vehicles and equipment. This is the place to ﬁnd perfect solutions — for every need, every company size, and every application. For more on the event, visit www.bauma.de.

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14 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net

YOUR BUSINESS

QUICK POLL UPCOMING EVENTS Do you like to use concrete with a high percentage of ﬂy ash? UPCOMING EVENTS April/May 46% This month’s Quick Poll: How much does 4/11-4/17: bauma 2016 in We are glad to use it sustainability (LEED-based requirements) Munich, Germany 26% come up in your contracts? To answer, 4/17-4/21: ACI Spring We don’t mind using it visit www.concreteconstruction.net. 2016 Convention – Brewing 28% Concrete in Milwaukee We dislike it for ﬂatwork 5/10-5/12: Strategic Development Council and Concrete Construction 2029, NOMINATIONS San Antonio 5/16-5/18: ASCC Committee Call for America’s Concrete Contractors Week, St. Louis

CONCRETE CONSTRUCTION magazine is looking for North America’s CONNECT most successful and well-run concrete contractors. Are you one of them? Is your safety record outstanding? Do you have employees fb.me/ConcreteConstructionMag that have stayed with you through high and low? Tell us what you feel deﬁnes a great concrete contractor and why you qualify. Those @ConcreteConst chosen will be proﬁled in the July issue of CC. We’re not looking at go.hw.net/cclinkedin simply revenue anymore, just quality. For tips on applying, write to bit.do/IGCC CC Editor-in-Chief Bill Palmer at [email protected] or call concreteconstruction.net him at 773-494-4619. concreteconstruction.net/videos Deadline is April 29, 2016.

16 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net Meet the new Kubota SSV75. Built with the precision engineering you’ve come to expect from Kubota, it features a smooth-running 74.3 HP Kubota diesel engine, vertical loader lift arms, a tilt-up cab and more. The SSV is pure Kubota, and delivers the kind of performance that raises eyebrows. And drops jaws. Locate your dealer today at Kubota.com/Construction. © Kubota Tractor Corporation, 2015. UNCOMMON SENSE

Uncommon Sense Live We talked with columnist Craig Cottomgim at World of Concrete. Watch the video at bit.do/cccraigvideo.

Craig Cottongim [email protected]

A Top 10 in Concrete

TO SAY THIS year’s World of Concrete was inspirational would be an understatement. While my wife and I walked around the Las Vegas Convention Center absorbing the enormousness of it all, it hit me once again how great concrete is. It inspired me to pass on my Top 10 reasons why anyone would be proud to work in concrete:

1 Working with concrete, we can create just about 5 Concrete tests every ﬁber of your being and your anything. People shape all sorts of artwork with capabilities, and it offers a sense of accomplishment. concrete. People build entire homes with concrete, When you work in concrete, you’ve done something roof and all. Beyond countertops and sinks, even exceptional that few people could do. furniture is now being fashioned from concrete. The only limit is our imagination. 6 Without an infrastructure largely depending on concrete, everything would come to a standstill. We 2 Concrete endures. The Roman aqueducts create the world’s best roads and bridges, the safest are still standing after 2000 years. Think of the power plants, and we make it possible for clean water many concrete structures that have withstood the and sewage plants to sustain communities’ health. strongest earthquakes and hurricanes. 7 Our trade is built on integrity. Concrete 3 Some of the phenomenal beneﬁts of working tradesmen can either cut the mustard or they can’t, in concrete are the limitless possibilities of and you know this as soon as they show up at the improving your pay and position. People with a jobsite. Politicians and academics might be able high school education or less can work their way to pull the wool over the eyes of their people, but up to superintendent, project manager, or even there’s no room for posers in our world. own their own company. I should know. My dad didn’t graduate from high school, and after he was 8 Concrete is interesting and multifaceted. The a foreman for a large union contractor, he started challenges we face are fascinating and intellectually his own successful company. From apprenticeship stimulating, from changing weather conditions programs to leadership opportunities, you’ll develop to the different situations each new job presents. more working in concrete than anywhere else. Innovations keep us on our toes as we adapt to new and better ways of doing a timeless job. 4 Concrete tradesmen will always be in demand. Right now there’s a shortage of experienced help, 9 The industry exposes you to the best mentors which is great news for young people who are you’ll ever have. I can’t count all of the people who looking for respectable employment. It also offers job took their time to shape me. It’s humbling to think security for those of us with a few gray hairs. of all the great people to whom I’m indebted.

Projects made with concrete, 10 Concrete advances the civilized world. Hospitals, like the San Diego colleges, laboratories, libraries, city halls, and all Central Courthouse, help advance the modes of travel depend on concrete’s rock solid civilized world. foundation. Our world wouldn’t exist without us! PHOTO: MORLEY CONSTRUCTION Concrete is rewarding and satisfying. We enjoy an unlimited career path allowing us to experience boundless possibilities. Tell me why you’re pumped about working in concrete! CC

18 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net

FORMWORK

Tall Towers Carry High Hopes

Expert planning and construction helps crews on the East End Crossing Bridge.

BY TOM KLEMENS THE OHIO RIVER that rise 300 feet above the water to about 100 feet long, 50 feet wide, and Bridges project consists of two new support a 1,200-foot main span. The 16 feet tall. “We precast the footing bridges over the Ohio River between joint venture design-build contractor, boxes, or footing tubs, in a dry dock, Louisville, Ky., and southern Indiana. Walsh-Vinci, chose PERI technology then ﬂoated each one into position,” The Downtown Crossing bridge to meet the numerous forming says Jeff St. John, Walsh-Vinci’s will add capacity to Interstate 65 challenges: lower legs that lean section 5 manager for the cable- in downtown Louisville; the East outward on a radius and taper in both stayed bridge. End Crossing, 8 miles upriver, dimensions, a hollow lower cross strut At that point, crews removed the provides a new crossing. In addition at road level, hollow upper legs on a 8-foot 6-inch diameter plugs that had to major congestion relief, the East radius leaning inward and tapering in been cast into the tub ﬂoor where End Crossing will be a catalyst for one dimension, and innovative anchor 12 drilled shaft caissons would go economic growth on both sides of boxes for the cable stays topped off the river, completing the I-265 loop with a hollow upper cross strut. connecting Jefferson County in The contractor is using two large Kentucky with southern Indiana. tower cranes (one at each tower) next The East End Crossing bridge features two convex diamond- The East End Crossing bridge to the pylon foundations in the river shaped reinforced concrete towers features two convex diamond-shaped channel. The foundations themselves that rise 300 feet above the water and are 1200 feet apart. reinforced concrete towers, or pylons, began as precast footing boxes, each PHOTOS: PERI FORMWORK SYSTEMS

www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 21 FORMWORK

to support the pylon foundation. Removing the plugs allowed the tub to settle onto temporary steel framework about 10 feet below water level. “Then we used the footing box as a template to do all the drilled shafts,” St. John Because the upper towers are says. After connecting the box to the hollow, thermal control was not nearly as difﬁcult, allowing caissons, it was ﬁlled with No. 14 the contractor to cycle the rebar and 3,000 yards of concrete, formwork faster. completing the pylon foundation.

Going up Building the towers depended heavily on several sets of formwork. “We broke the pylon up into five main sections, or phases, treating each one like a brand new structure,” says Mark Henning, sales engineer with PERI Formwork Systems Inc. The lower legs, lower strut, upper legs, the stay anchors, and the upper strut each required a separate set of formwork and a completely separate set of platforms. Each set of forms was preassembled in PERI’s Calumet Park yard, south of Chicago, and trucked to Louisville. Knowing they’d be working through the winter, the contractor also had PERI put insulation between the ribs of the forms. “That meant our guys didn’t have to mess around with the insulation,” St. John says. “I’m extremely happy we did that. It was a little extra money up front, but dealing with it onsite would have cost significantly more.” The lower legs required four 15- foot mass concrete pours. Because that concrete required an extended cure time, the forms for each leg were designed to allow the contractor to use a leapfrog process. Concrete for the tower has a minimum strength of 6,000 psi. It is batched by a local producer with “One of the more significant A trestle built out from each plants on both sides of the river. With challenges of getting the concrete shoreline provides access to the no preapproved mix designs for the approved on these projects is that, pylons. Almost all of the concrete project, the contractor was responsible like many other major projects now for the lower legs was pumped, for coming up with designs for both coming out, this job has a 100-year with the pump trucks located on the mass concrete portion and a more service life requirement,” St. John the trestle ends that had been rapid-strength-gain mix for the upper says. “That has a huge impact on your expanded and reinforced specifically legs and struts. concrete mix design.” for this purpose.

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Knuckles and struts tower so they could be put in place tables. After flying in the towers one Building the lower strut and the without tying up the crane. at a time, the preassembled truss knuckles, where the lower strut To form the lower horizontal strut, table was transported in four sections. connects and the legs change PERI provided six of its heavy-duty After placing the lower horizontal direction, was challenging. “The four-leg VST shoring towers, each slab, crews formed and placed the two shoring and formwork for the lower capable of supporting 600 kips, and vertical walls and then the upper slab. strut was a valuable part of the soffit formwork consisting of truss The shoring towers were equipped solution that PERI provided,” St. John with hydraulic lowering heads, which says. Building the cross strut and made it easy to strip the truss table knuckles took almost four months. as soon as the concrete came up to “The congestion and the special strength. bends that were required to Meanwhile, work continued on accommodate the knuckle, combined the hollow upper tower legs with a with the post-tensioning in the strut new set of formwork. “The internal and the transition into that roadway platform and custom steel formwork strut, made it difficult,” St. John on the inside climbed hydraulically says. “There were a lot of odd bar with our lighter-weight rail-climbing shapes, and they all needed to be system, while the external platforms bent nearly perfectly so they would and Vario formwork climbed Building the towers depended heavily upon a fit.” Fortunately, the reinforcing flexible system that consisted of several unique hydraulically with our heavier-duty steel subcontractor was already sets of formwork. ACS rail-climbing system,” Henning accustomed to fabricating the rebar Visit bit.do/ohiobridgepics for a slideshow says. Crews completed several lifts and cages on barges at the base of the with more photos. on the upper legs while the horizontal

24 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net

FORMWORK

strut was still being completed. concrete that could achieve strength Although there is less reinforcing The upper towers are hollow, faster to accommodate the formwork steel in the upper tower legs, it ends so thermal control was not nearly cycle,” says St. John. “We developed up being more congested because it as much of a requirement, “That a signiﬁcantly different concrete all must ﬁt into a smaller space. So allowed us to cycle our formwork mix than what we used in the lower the mix for the upper legs also used faster, which meant we wanted a towers for that faster cycle.” smaller aggregate. Concrete was placed in the upper legs and strut by crane and bucket.

Going past the stay boxes Coordinating the design of the steel The Freedom To Be stay anchor boxes with the interior climbing formwork and platforms Everywhere At Once was quite beneficial. PERI designed its internal platform and formwork to Get Connected with allow it to be split in half. At the same TimeSummit Connect.™ time, the anchor boxes were designed Know what’s going on in to only take up half the space inside the field at a glance. the tower, knowing that the formwork With a tap of the screen could be split and just keep climbing. on our cloud-based time “The idea was to save both weight tracking system, you can and money,” St. John says. “Most of view vital data from any one the boxes we put up there were 12 of your work sites. Get the feet tall and only half the width of information you need to the upper tower. If we made them full make informed business width, we’d either have had to have decisions on the go. a bigger tower crane or go to 6-foot boxes, due to the weight, which would have added splicing time and labor.” At two points as the tower height increased, a set of two 30-inch diameter steel pipes were installed to act as compression struts to limit deflection of the inward leaning concrete legs. A third compression Manage your workforce strut consisting of another PERI from anywhere. VST shoring tower was built into the formwork for the upper strut, simplifying both its installation and subsequent removal. Formwork sections for the upper horizontal strut were preassembled and flown in, just as they had been for the lower strut. The towers were expected to reach full height in late February or early March 2016 with the grand opening scheduled for the end of the year. CC

Visit www.eastendcrossing.com for live webcams showing the construction.

We give your business the freedom to do more. Tom Klemens is a freelance writer 1.877.577.0411 www.exaktime.com/cc based in Chicago.

26 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net The Worldwide Leader in Concrete Paving Technology

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INFRASTRUCTURE PROJECTS

2016 Triad Award Winner: Elevating Concrete A contractor and DOT combine sustainability and new paving techniques to rebuild a major mountain thoroughfare.

SHELBY O. MITCHELL WHEN GENEVA ROCK Products Inc. in Murray, Utah, won the bid for a $34.6 million Utah Department of Transportation (UDOT) design-bid-build project in April 2014, the clock was already ticking. The state agency had determined that a 7.5-mile stretch of Interstate 80, between Silver Creek Junction and Wanship, wouldn’t make it through another winter. The original asphalt road through Silver Creek Canyon was built in the 1960s and had been repaved many times, including several “mill-and-ﬁlls” in the past 15 years. Much of the rutting and cracking on I-80 was caused by

A rebuilt section of I-80 in Utah won the 2016 Triad Award. The contractors, state DOT, and materials suppliers precisely coordinated the project timeline, executed challenging logistics, and improved the sustainability of this award-winning project. PHOTO: GENEVA ROCK PRODUCTS

www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 29 INFRASTRUCTURE PROJECTS

the heavy-duty trucks that make up about half of the traffic on the state’s major east-west commercial corridor. Climate also played a part in the pavement’s surface failures, with extreme temperatures and frequent freeze/ thaw cycles occurring at the 6,400- foot elevation. “We select the type of pavement for each section of roadway based on what makes the most sense in a particular area, and this was no longer a good candidate for asphalt,” says Matt Zundel, resident engineer for UDOT. Aside from the cost of constant repairs, the mountain canyon terrain is not conducive to construction. “Limited access in the canyon makes it extremely difficult to work on, so it was important to design a new pavement with at least a 40-year lifespan,” says Zundel. With this specification, and a deadline Geneva Rock implemented many sustainable elements during the project: reducing and replacing cement content, using eco-friendly primer, recycling materials, and reducing waste disposal. to complete the eastbound lanes before PHOTO: GENEVA ROCK PRODUCTS winter, Geneva Rock began work in mid- June. “We got the mix design and trial batches going right away,” says Cody “Typically, we’ll grind up the entire curing period. But since access was Preston, concrete paving manager. asphalt pavement, move it to one side difficult for water trucks, the agency Preston had been testing a new, of the road, and then replace part of allowed Geneva Rock to substitute a sustainable concrete mix using it — the ground asphalt and its original prime coat as a curing agent. The fast- Envirocore cement from Holcim (US) Inc. aggregate base — at an even depth,” says curing ePrime primer was applied several With uncalcined limestone ground in Joe Serre, project manager for Geneva times a day. with portland cement clinker, Envirocore Rock. Here, the contractor ground only The jobsite could only be accessed has a lower carbon footprint than the top few inches of asphalt using a from each end and one interchange near traditional cement. profile mill, and spread the tailings to the middle, and concrete could not be But Preston hesitated to try a new mix create a 4-inch base of recycled asphalt placed until the CTAB was completed on a tight timeline. Instead, he selected material. “This was a new process for to the access point. “After we did the a more traditional portland cement UDOT, using only the recycled asphalt,” reclamation, we needed to get in and concrete paving (PCCP) mix with Type says Serre, “but it allowed us to produce keep the project moving so the concrete II/V cement for the project’s first phase a superior base material that held up trucks and pavers could start the paving and ran side-by-side trial batches of the very well during construction.” process as soon as possible,” says Serre. Envirocore mix to test its performance. Coughlin Co., a subcontractor based They determined the cement-treated in St. George, Utah, applied portland base gained enough strength before 72 Necessity leads to innovation cement and water and mixed it in with hours that light truck traffic was not Geneva Rock began work in mid-June, the milling machine to create the CTAB. detrimental. closing the eastbound lanes of I-80 and The concrete-like material was specified After about a week of working on the leaving one lane open in each direction by UDOT to provide more structural CTAB, the contractor began delivering on the westbound side. The project support and durability than rubblized concrete from its portable plant at the specified 12 inches of portland cement material alone. Although the agency had west end of the project. The 12-cubic- concrete pavement to be placed over specified a 9% to 11% cement content, yard Erie Strayer plant produced up to 4 inches of cement-treated asphalt base Geneva Rock produced test strips and 300 cubic yards of concrete an hour, (CTAB). determined it could reach the required delivered to pavers by 10 to 20 trucks at UDOT required a partial depth strength (300-500 psi in seven days) a given time. reclamation to reuse a portion of the using just 7% cement at a significant With mild weather on their side, existing asphalt. But with a cliff on one cost savings. Geneva Rock paved the two 12-foot side and a mountain on the other, the Once the base was compacted and eastbound lanes to complete the first jobsite configuration was limiting. shaped, UDOT required a 72-hour wet phase in November 2014.

30 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net 5HOD[5HOD[ 8VH'HFR3HHOWRUHPRYHZRUQ DFU\OLFVHDOHUVIURPGHFRUDWLYH FRQFUHWHDQGWKHKDUGZRUNLVGRQH 6DYHWLPHZLWKRXWVDFULILFLQJTXDOLW\ZLWK1(:'HFR3HHO 1(: WKHGHFRUDWLYHDFU\OLFVHDOHUEODQNHWUHPRYDOV\VWHP :LWK'HFR3HHOWKHUH VQRQHHGWRZDVWH\RXUHQHUJ\RQ PHVV\ KDUGWRGLVSRVH RI KD]DUGRXV VROYHQWV RU EXON\ SUHVVXUHZDVKHUV 7KDQNV WR 'HFR3HHO·V FRQWUROOHG EODQNHW DSSOLFDWLRQ KDUGWRUHDFKGHFRUDWLYHFRQFUHWHQHDUVHQVLWLYHODQGVFDSLQJ LVQRORQJHUDFKDOOHQJH 'HFR3HHO V EUHDNWKURXJK EODQNHW UHPRYDO V\VWHP SHUIHFWVWKHUHPRYDORIFKDON\FORXG\RUZRUQDFU\OLFVHDOHUV $ 5ROOLWRXW % 5ROOLWRQ & 3HHOLWRII IURP GHFRUDWLYH FRQFUHWH ZKLOH SURWHFWLQJ WKH VHQVLWLYH ODQGVFDSLQJSRROVDQGEXLOGLQJVVXVFHSWLEOHWRGDPDJHIURP UHVLQGHEULV *HWPRUHGRQHLQDGD\ZLWKOHVV PHVVHDV\FOHDQXSDQGQRSUHVVXUH ZDVKLQJ5HOD[ZLWK'HFR3HHO

1RPLQDWHG )HDWXUHGLQ 0267 )LQLVKWKHMREULJKW8VH1R[&UHWHVHDOHUVWR ,1129$7,9( &21&5(7( EULQJ\RXUGHFRUDWLYHFRQFUHWHEDFNWROLIH 352'8&7 3URWHFW\RXUGHFRUDWLYHFRQFUHWHZLWKDORQJODVWLQJKLJKTXDOLW\GHFRUDWLYH &216758&7,21 DFU\OLFVHDOHUIURP1R[&UHWH2XUEUHDWKDEOHGHFRUDWLYHVHDOHUVXVHWKHKLJKHVW 5HDG$ERXW JUDGHRIDFU\OLFUHVLQVDQGGHHSSHQHWUDWLQJVROYHQWVSURYLGLQJH[FHOOHQWZDWHUYDSRU SHUPHDELOLW\WKDWKHOSVSUHYHQWVHDOHUVIURPSHHOLQJDQGEOLVWHULQJ 'HFR3HHO 6SDUNO6HDO 1DWUDVHDO +RXU)DFHOLIW %\5LFN

Winter break so we switched back to a normal lane and workability with the Envirocore “The cost of cold weather paving is configuration until spring.” test mix during the first season,” says prohibitive, so we generally don’t do it,” In the months before the next phase, Preston, “so we planned to use it on the says Zundel. “We were also concerned Geneva Rock focused on ways to improve westbound lanes.” about the safety of having head-to-head sustainability and productivity. “We had The portland-limestone cement, traffic on the interstate during winter, seen equivalent performance in strength combined with 25% fly ash replacement of portland cement per state

requirements, reduced the overall CO2 footprint by 35%. Preston also switched to a new sand from a supplier closer to the jobsite to reduce hauling. Before the I-80 project began, Geneva Rock had considered adding wireless controls to its pavers. But with the accelerated schedule of the first phase, they didn’t have time to install the new technology and train employees how to use it. After working in Silver Creek Canyon, it became clear this was the ideal job for paving without string lines. “The roadway was about 40 feet wide, and the pavers took up about 26 to 30 feet, including wire guidelines for the sensors,” says Preston. “This made it difficult for the concrete trucks to drive up and turn around before delivering their material.” Before spring, the contractor added Trimble PCS900 paving controls to two of its four Gomaco slipform pavers, THE BEST MIXER MADE and employees learned how to remotely FOR YOU. steer the pavers and use the SPS930 Universal Total Station to control the pan for proper alignment, design, and slope of the pavement. “This was the ® You can’t top the original Zim Mixer … first time Trimble and Gomaco had the Industry-Leading Volumetric Concrete Mixer. used this system with a zero clearance paving setup,” says Preston. “We worked together to do it successfully on our tight Patented, self-cleaning dual shoulder paving.” chain-feed system assures low- Without guide wires, workers didn’t maintenance, dependability, have to worry about tripping or breaking long-lasting service. Accurately the stringline and stopping the machines. mix a better, custom, fresh pour Concrete trucks could also get closer

TECHNOLOGY on-site…with no waste. to the pavers before turning around to unload, instead of having to back all the way down the grade. Call Toll Free: 888-576-6499 View our video online or call for your own DVD. A sustainable approach Geneva Rock rebuilt the westbound lanes between April and October 2015, in what Zimmerman Industries, Inc. seemed like an entirely different project: Ephrata, PA USA | Phone: 717-733-6166 better weather, a new concrete mix, and a groundbreaking paving process. In the www.zimmermanindustries.com end, it had placed 377,500 square yards of concrete.

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Although UDOT doesn’t plan to keeping an eye on this new pavement’s replace this stretch of I-80 again soon, performance,” says Zundel. CC the agency may consider adopting some elements of the project in the future. Shelby O. Mitchell is a Berwyn, Ill.-based “We are always looking for ways to make freelance writer. You can e-mail her at our concrete more sustainable, so we’ll be [email protected].

2016 Triad Awards

Each year, the editors of CONCRETE CONSTRUCTION, THE CONCRETE PRODUCER, and PUBLIC WORKS magazines, with support from LafargeHolcim, showcase a publicly owned concrete project that displays outstanding innovation, sustainability, and leadership. Experts from the winning project team and runners-up were honored at World of Concrete 2016. See www.triadaward.com for videos and all project entries.

2016 Triad Award winners received custom-designed, etched concrete plaques and coasters. The pieces were created by Billy Losleben, designer and head of Concrete-Project, a creative ﬁrm that designs, develops, and produces unique concrete objects. See www.concrete-project.com.

PHOTO: JACK WHITE

34 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net Runners-up

Second Avenue Subway Tunnel Southeast Collector Trunk Sewer Project New York City Ontario, Canada

This $4.4 billion project is New York City’s first new subway line in To build a new, 8-mile trunk sewer line extension, the project team more than 70 years. It is believed to be the city’s first cast-in-place was tasked with boring tunnels more than 130 feet below the tunnel with steel fibers replacing reinforcing steel in its liner. surface, and creating formwork to build 13 ventilation shafts.

PHOTO: MARC A. HERMANN / MTA NEW YORK CITY TRANSIT PHOTO: DOKA

Visit www.triadaward.com for more photos of the winning Triad Award project and for details on all of the entrants.

www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 35

March 2016

The best way to improve your acid-staining technique; pg CS-41 This concrete has everyone www.concretesurfacesmag.com saying WOW!; pg CS-49

Lazy Concrete River Turn to pg CS-45 to ﬁnd out why readers think this award-winning ﬂoor is so special. GRIND

POLISH

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Why Polishing Contractors Get Screwed

THE TOPIC OF this year’s always-popular World of Concrete Polishing Luncheon & Forum was “A Game of Whisper: Specifying a Polished Concrete Floor.” By the time the panel discussion ended, I decided it’s a miracle clients ever get the floor they envision. Architects, design engineers, general Stephanie Johnston contractors, slab contractors, and finishers Editor [email protected] know virtually nothing about polishing concrete, so the process seems doomed from the start. Most architects know only that concrete is less maintenance- intensive than tile, carpet, or wood. Neither they, nor the person SHOWCASE most likely to write the specification, the firm’s specifier (yes, that’s right: architects often don’t write “their” specification), know the Readers Make Concrete Polishing Association of America exists. So they use the American Institute of Architects’ one-page specification. Neither party knows what the polisher can and can’t control, or Their Choice that admixtures make polishing more difficult. Learn more about Charley's Concrete Lazy River, the Then there’s the unfortunate reality that many details critical to award-winning cover project referred to in the Edi- delivering the floor the client envisions can’t be specified. tor's Note at left. Thanks to those of you who voted The designer puts joints where they make the most sense last fall for our 2015 Polished Concrete Awards' structurally, not where they’ll be least obtrusive. He’s not thinking Readers' Choice. about what people will see or walk on when the project’s completed. Owners and general contractors often don’t even tell place-and- pg CS-45 finish contractors the floor will be polished. Our award-winning cover subject’s artisanship and technical Departments skill are exemplary. But Mark Womack also had several key Decorative Concrete ...... CS-41 things working in his favor. His client’s a ready-mix producer; the How to improve your acid-staining technique. The project was new construction; and he, the owner, and the general application is simple, but there's a lot more than contractor worked together from the beginning. meets the eye. If your specialty is polishing, I suppose you know all this. What Products ...... online you may not know is how to counteract this tsunami of ignorance. Visit www.concretesurfacesmag.com for the latest To find out, watch the video of the forum panelists at bit.do/ joint fillers and a plethora of other new products. cspolish. Architect Mike Stellato (Star Consulting Group), finisher Bryan Birdwell (Structural Services Inc.), and polisher Shane Beal Feature (The Professionals) explain how to respectfully influence the quality Top Dog in Decorative Concrete ...... CS-49 of each step in the process. Check out the American Society of Concrete Control your destiny! Contractors Decorative Concrete Council's WOW! award-winning project for 2015.

ON THE WEB Cover: Mark Womack of Monster Constructors developed this design for a ready-mix concrete VISIT WWW.CONCRETESURFACESMAG.COM TO... supplier in Keller, Texas. Photo: Mark Womack Designs LLC, dba Monster Constructors • Watch the World of Concrete Polishing Luncheon & Forum speaker video: bit.do/cspolish. • After reading about the grand prize-winning WOW! project For comments and questions, please contact: on page 49, see photos of the rest of the 2015 Decorative Editor | Stephanie Johnston, [email protected] Concrete Council award-winners. Group Managing Editor | Tom Bagsarian, [email protected] • Learn about new joint ﬁllers. Community Manager | Sharon J. Rehana, [email protected] Art Director | Robb Ogle, [email protected]

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The Dirty Secret About Acid Stain What you need to know about preparing the ﬂ oor that most manufacturers don’t tell you.

Steve VandeWater

topcoat bond. If residue isn’t aggres- A well-cleaned and highly mottled acid- sively removed, it can shorten the sealer’s stained ﬂ oor. lifespan or even cause it to delaminate Photo: Steve VandeWater from the slab. Just like painting over dirt, sealing over residue is a bad idea. Yet that’s exactly what most people do.

A mop is just the beginning I often speak with both contractors and homeowners who’ve recently completed an acid stain job. Many say the stain didn’t come out as mottled and varie- gated as they had hoped. Some say the color turned out very differently from that shown on the color chart. An amber stain appeared more orange than yellow, for example. When I ask how they cleaned the slab after staining, they invariably say, “I neu- tralized it and mopped it fi ve times until ACID STAIN HAS been around for a solution is adequate. According to the the rinse water was clear.” They seem long time, and most decorative concrete instructions, when the rinse water is clear, shocked when I ask them, “Is that all?” contractors have stained a fl oor at least the fl oor is clean. I made the same mistake early in my once. The process seems so simple, in Having used acid stain in commercial career. I followed the tech data sheet rec- fact, that many homeowners tackle it as a environments for several years and seeing ommendations as well as I could interpret do-it-yourself project. fi rsthand the problems associated with them, but they were unclear. When they While the application itself is relatively insuffi cient cleaning, I maintain that this is said the fl oor needed to be thoroughly simple, there’s a lot more to turning out not the case. clean, and mentioned the mop water a complete job than meets the eye. One being clear, I assumed that a mop was all of the most crucial yet neglected facets The difference between cleaning that was needed to remove the residue. involves properly cleaning the residue and neutralizing How wrong I was. I realized something between the staining and sealing phases. First, cleaning and neutralizing are two was amiss when I began getting callbacks. It’s no wonder this step is neglected. entirely different processes. One renders There were instances when the paint- It isn’t detailed in many manufacturers’ the surface neither acidic nor basic; the ers had taped masking paper or plastic literature. Their tech data sheets say to other removes all foreign matter. to a stained fl oor to protect it. When the clean and neutralize the residue, but they To put it plainly, residue can be pH- tape was peeled up, the sealer and some don’t say how to do it properly. The way neutral but still present on the surface. of the stain came up with it, leaving a most literature reads, simply mopping Whether or not it’s neutral, it’s still a much lighter spot. The painters always the fl oor repeatedly with a neutralizing foreign substance that can affect the used the easy peel type of painter’s tape,

www.concretesurfacesmag.com CONCRETE SURFACES March 2016 CS-41 DECORATIVE CONCRETE

so I was perplexed as to why it pulled up patterns. There were paths where servers It got me thinking. These floors still the sealer. Furthermore, why was stain had constantly walked and areas under had color in the worn spots, but it was sticking to the sealer? chairs that had been repeatedly pulled in the right color. How could I achieve that Another time, upon returning to a and out. These areas were lighter than color on a whole slab? And why was restaurant that I’d stained, I noticed an the surrounding areas and closer to the the rest of the floor so dark and even- interesting thing: The floor showed wear color on the chart. colored?

A process that gets it all The answer to both questions was painfully obvious: There had still been residue on the floor when I sealed it. If I’d removed enough, the floor would have been the lighter color. From that day on, I tried to be more aggressive with my cleaning. First, I tried scrubbing with a stiff brush 1-800-282-3388 | www.butterfieldcolor.com before mopping it. That took up slightly more residue than the mop alone, but it still didn’t achieve the results I was Thank You! looking for. Plus, scrubbing by hand was hard work! I finally tried a rotary floor scrubber BUTTERFIELD COLOR® would like to thank everyone for visiting our outdoor equipped with a black pad and water. space at the 2016 World of Concrete show! Our thanks and appreciation is The amount of sludge it created was extended to our Distribution Network and Contractors who sell and use our remarkable. I had to suck it up with products on a daily basis! a wet vac before I could even begin mopping. Needless to say, I was blown away by the amount of residue I’d been leaving on the surface. At first this process scared me. It took off so much additional residue that I thought the stain was coming off. However, that made no sense Decorative Products Manufacturing a complete line of Concrete because acid stain is supposed to become an integral part of the surface. All the literature says that the color is achieved solely by chemical reaction, and that the stain will wear only as the concrete surface itself wears. I knew that scrubbing with a pad certainly wasn’t wearing away the concrete, so everything that was coming off had to be residue. The combination of a floor scrubber and wet vac worked like a charm, and from then on my floors looked and performed as they should. Give it a try. CS

Steve VandeWater is the manager of The Concrete Store in Fishers, Ind. He is a former Indianapolis-area contractor and creator of the Please visit our website to view more pictures from the show Indiana Decorative Concrete Network website. and for more information on our new products E-mail [email protected]; visit http://indecorativeconcrete.com.

CS-42 March 2016 CONCRETE SURFACES www.concretesurfacesmag.com ResourcesNew forConcrete Contractors

Concrete Fundamentals Placing and Finishing This book provides an overview of concrete and concrete Decorative Concrete Flatwork construction. It makes a great training manual or refresher for This photo-rich book provides knowledge of the materials, concrete craftsmen. equipment, and techniques required to successfully install decorative concrete flatwork. Additional titles in the Concrete Craftsman Series Slabs-on-Ground and Shotcrete for the Craftsman

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High Tide Exquisite, hand-crafted lazy river scene turns heads and wins award.

THE UNIQUE DESIGN of Charley's Con- crete Lazy River was developed by artisan Mark Womack of Monster Constructors, with discussions with Brent Pennington, president of Charley’s Concrete, and general contractor Key Custom Homes. Penning- ton desired a lodge-style lobby to include trophy hunts from hunting. So Womack created the stimulating aesthetics of a lazy river running through sand and aggregate while weaving through the office floor plan. The contractor chose Green Umbrella as the polishing system for its ability to en- hance and speed the polishing process. The stain for the project was SS Special- ties’s SS DYE-namic UV Formula due to its versatile color pallet that allows custom blending options. Phase one included designing, staining, and the initial polishing of the slab before building construction began. Phase two started as the building neared completion and included reopening the floor with 400 resin, touch-up staining, and reapplying a densifier from Green Umbrella. This was followed by an 800-resin polishing and then 1500 and 3000 burnishing pads. The fin- ished floor had a super-durable, high-gloss Monster Constructers' Mark Womack created the stimulating aesthetics of a lazy river surface with a gloss read of 76/77 from running through sand and aggregate while weaving through the office floor plan. Photos: Mark Womack Designs, LLC dba Monster Constructors edge to edge. The completed project was a great success. www.concretesurfacesmag.com CONCRETE SURFACES March 2016 CS-45 SHOWCASE

PROJECT DETAILS Owner: Charley’s Concrete Location: Keller, Texas Contractor: Mark Womack, Monster Constructors, Krugerville, Texas Architect/designer: Mark Womack, Mark Womack Designs LLC, Krugerville, Texas General Contractor: Kent Key, Key Custom Homes, Denton, Texas Subcontractor: Monte Lusk, Texas Stain & Polish, Dallas Amount of polished concrete: 5,500 square feet Size of building/project: 8,500 square feet

Phase one included designing, staining, and the initial polishing of the slab before building construction began.

This project won the Reader’s Choice category in the 2015 Concrete Surfaces Polished Concrete Awards. For more details, photos, and videos of this project, visit bit.do/cscharleyriver. We start accepting 2016 award entries in June. Visit www.concretesurfacesmag.com.

CS-46 March 2016 CONCRETE SURFACES www.concretesurfacesmag.com

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Oh WOW! Decorative association’s top honor goes to the cast-in-place and polished frame supporting architect’s award-winning design.

By Stephanie Johnston

YOU CAN’T TELL by looking at it, ﬁrst. So does the aluminum fan above Baker Concrete Construction’s work but most of the two-story building that the glass roof that, like louvered blinds, on Florida Polytechnic University’s Innovation, Science and Technology anchors Florida’s newest and only public rotates to shade classrooms, auditorium, Building earned two 2015 Decorative university devoted to science, technology, ofﬁces, and labs as the sun moves from Concrete Council awards: Architectural Cast-in-Place Structures (over 5,000 engineering, and math is made of east to west every day. square feet) and the WOW! grand prize. concrete. They’re both very, very cool. But Photo: ASCC That’s because the curved aluminum neither would be possible without the pergolas that run around the outside award-winning skeleton provided by of the oval building grab your attention cast-in-place specialist Baker Concrete www.concretesurfacesmag.com CONCRETE SURFACES March 2016 CS-49 DECORATIVE CONCRETE

Construction Inc. Founded in Oxford, High Stadium. With Florida Polytechnic Ohio, in 1968 by the grandson of a University’s Innovation, Science, and cement and stone mason, the company’s Technology Building, the company’s Ft. 13 locations have worked on such iconic Lauderdale ofﬁce adds Spanish architect projects as the Rock ‘N Roll Hall of Santiago Calatrava’s distinctive work to Fame in Cleveland and Denver’s Mile- that list.

Aluminum pergolas shade walkways all around the two-story, reinforced-concrete Innovation, Science and Technology Building. It's topped by an aluminum sunshade that lets light, but not heat, through the glass ceiling. Photo: Florida Polytechnic University

A total of 142 column portals spaced 8 feet on center in a curve frame the hallway and support the second story. They required triangular bracing between two columns, using self-consolidating concrete to monolithically pour. After column construction, the second-level elevated beams and slabs were done. Photo: Florida Polytechnic University

Originally designed to be steel, the building’s structural material was switched to reinforced concrete by the general contractor. Baker Concrete provided an oval ring beam 72 inches deep and 30 inches wide, which supports the roof and provides the sternum to which a ribcage of structural columns attaches. Architectural concrete began with 142 column portals spaced at 8 feet on center in a curving layout that frames the hallway and supports the second story. Their shape required triangular bracing between two columns, using self- consolidating concrete to monolithically pour. After column construction, the second-ﬂoor elevated beams and slabs were completed and followed by polished ground-ﬂoor concrete slabs. The two entrances began with

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Florida Polytechnic University’s two-story, cast-in-place concrete Innovation, Sci- ence and Technology Building houses 26 classrooms, an auditorium, faculty and administrative ofﬁ ces, an 11,000-square-foot Commons area, and 11 labs. Photo: ASCC connecting to 16 unique raker portals. These portals support the roof and tie into the concrete ring through which the sun shines to illuminate the grand entry’s polished concrete stairs. Don Marks and Geoff Bunnell accepted the American Society of Concrete Contractors’ Decorative Concrete Council’s grand prize on behalf of Baker Concrete Construction at World of Concrete last month. That’s where the ‘WE LIVE IN 3D’ council announced winners of its eighth Owner: Florida Polytechnic Concrete Contractor: Baker annual award program. University Concrete Construction Inc., Ft. Look for photos and more details of the Project: Innovation, Science, Lauderdale, Fla. 28 winners in our upcoming post-show and Technology (IST) Building General Contractor: Skanska USA Location: Lakeland, Fla. Building Inc. digital issue. Size: 162,000 square feet Design Architect: Santiago Visit www.ascconline.org to submit a Cost: $60 million Calatrava/Festina Lente LLC project for next year’s awards. CS

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American Concrete Institute ...... CS-43 ...... www.concrete.org AD INDEX American Society of Concrete Contractors ...... Cover 3 BackSaver ...... CS-52 ...... www.hammerdrillattachment.com Bobcat Company ...... 9 ...... 877-745-7813 ...... www.Bobcat.com/Roller1 Butterfield Color ...... CS-42, CS-52 ...... 800-282-3388 ...... www.butterfieldcolor.com Chrysler Group LLC ...... 2-3 ClearSpan Fabric Structures ...... 35 ...... 866-643-1010 ...... www.ClearSpan.com/ADCC Doka USA ...... 19 ...... 877-365-2872 ...... www.doka.com EDCO Equipment Development Co...... CS-48 ...... www.edcoinc.com Ellis Formwork Manufacturing Co...... 53 ...... 800-654-9261 ...... www.ellisforms.com ExakTime Inc...... 26 ...... 877-577-0411 ...... www.exaktime.com/cc Franmar Chemical, Inc...... CS-50 ...... 800-538-5069 ...... www.franmar.com GOMACO ...... 27 ...... www.gomaco.com Hanley Wood Media Inc...... www.hanleywood.com Concrete Construction Newsletters ...... CS-48 Concrete Construction Sponsorships ...... CS-51 Headwaters Resources...... 14 ...... www.flyash.com International Concrete Repair Institute ...... 20 ...... www.icri.org Jon-Don ...... CS-40 ...... 800-556-6366 ...... www.jondon.com Kubota Tractor Corp ...... 17 ...... www.Kubota.com/Construction Kut-Rite Manufacturing Co...... CS-51, CS-52 ...... www.kutritemfg.com Lackmond Products Inc ...... 34 ...... 800-850-2044 ...... www.Lackmond.com Ligchine International ...... 23 ...... www.ligchine.com Lignomat USA Ltd...... CS-48 ...... 800-227-2105 ...... www.lignomat.com MAX USA Corporation ...... 10 ...... 800-223-4293 ...... www.maxusacorp.com McKinnon Materials Inc ...... CS-47 ...... 866-622-7031 ...... www.mckinnonmaterials.com Multiquip ...... 25 ...... 800-421-1244 ...... www.multiquip.com Multivibe Corp ...... 36 ...... 877-220-6652 ...... www.multivibe.com Nox-Crete Products Group ...... 31 ...... www.nox-crete.com Oztec Industries, Inc...... 1 ...... 800-533-9055 ...... www.oztec.com PERI Formwork Systems Inc ...... 11 ...... www.peri-usa.com Power Curbers ...... 33 ...... www.powercurbers.com Putzmeister America Inc ...... Cover 4 ...... 800-884-7210 ...... www.PutzmeisterAmerica.com Quest Building Products ...... CS-44, CS-52 ...... 888-457-3887 ...... www.questbuilding.com Richway Industries ...... 53 ...... 800-553-2404 ...... www.cretefoamer.com RoMix Chemical & Brush, Inc...... CS-44 ...... 800-331-2243 ...... www.romixchem.com SafetyHats.com ...... Cover 2 Schwing America ...... 28 ...... 888-SCHWING ...... www.schwing.com SOLOMON COLORS BRICKFORM ...... 35 ...... 800-624-0261 Spin Screed Inc...... 53 ...... 888-329-6039 ...... www.spinscreed.com Stego Industries LLC ...... 6 ...... www.stegoindustries.com SuperAbrasive ...... CS-38 ...... www.superabrasive.com SureBuilt Manufacturing ...... 53 ...... www.surebuilt-usa.com Tekla, Inc...... 16 ...... www.tek.la/BetterPours The American Institute of Architects ...... 54 ...... www.aia.org/concreteconstruction The QUIKRETE Companies ...... 15 ...... 800-282-5828 Vexcon Chemicals Inc...... CS-44, CS-51 ...... 888-839-2661 ...... www.vexcon.com Wagner Meters ...... 8 ...... 800-207-2104 ...... www.rapidrh.com Wagner Meters ...... 24 ...... 800-207-2104 ...... www.wagnermeters.com/webinar WR Meadows, Inc...... 4 ...... 800-342-5976 ...... www.wrmeadows.com Wyco Tool Company ...... 12 ...... 800-233-9926 ...... www.wycotool.com Zimmerman Industries Inc ...... 32 ...... 888-576-6499 ...... www.zimmermanindustries.com www.concreteconstruction.net CONCRETE CONSTRUCTION March 2016 55 HOW-TO ZONE: CONCRETE BASICS

Curing Concrete Flatwork

WHEN YOU HEAR ABOUT CURING CONCRETE IT CAN MEAN DIFFERENT THINGS. CURING IS LETTING CONCRETE GROW INTO ITS FULL POTENTIAL BY KEEPING IT MOIST AND AT THE RIGHT TEMPERATURE SO THAT THE CEMENT CAN HYDRATE. THE CRITICAL PART OF CURING, THOUGH, IS ON A SLAB SURFACE (ITS SKIN, SO TO SPEAK--DON’T LET IT GET CHAPPED!).

1 When concrete is initially placed it’s 2 If our concrete baby’s skin gets dry, 3 Initial curing keeps the concrete like a newborn baby — it must be kept the cement doesn’t hydrate, resulting surface from drying out before the warm, but not too warm. While human in low strength at the surface. It also concrete sets — usually only needed in babies need to be dry, our concrete makes the concrete more porous (higher dry, windy conditions. This is done by baby needs to be wet. All of the concrete permeability) — again, especially at the fogging or spraying on an evaporation needs to be treated with care but usually surface. Drying of the surface can also retarder. This is followed by ﬁnal curing there’s plenty of moisture inside — it’s result in crazing and plastic shrinkage to keep the surface from drying for the surfaces that are most at risk. cracks. several days while it gets stronger.

4 There are two ways to cure a concrete 5 The more common way to cure the 6 When we get the curing right, the surface: Keep it damp or prevent it from surface is to spray on a curing compound surface will reach its full potential of drying out. To keep the surface damp, it that forms a thin membrane to prevent strength and durability. Our concrete can be misted with water or covered with the moisture in the concrete from baby’s skin will be dense and hard and curing blankets — some of the newer evaporating. This is sort of like putting he will have grown up to become strong, ones are very similar to a wet disposable the concrete inside a balloon and since reliable, and a good concrete citizen. diaper. This way of curing is ideal and there’s usually plenty of moisture in the has the advantage of leaving no residue wet concrete, as long as it can’t dry out, on the surface. it will cure.

ILLUSTRATIONS BY BADFISH DIGITAL STUDIO For more information on curing concrete go to www.concreteconstruction.net and click on the links.

56 March 2016 CONCRETE CONSTRUCTION www.concreteconstruction.net Photo: Next Level Sailing Photo: City of San Diego

AMERICAN SOCIET Y OF CONCRET E CONT RACT ORS

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TB 110 Truck-Mounted Telescopic Belt Conveyor Operating at up to 5 cubic yards per minute, the Putzmeister Telebelt® TB 110 can quickly convey concrete and a wide variety of materials ranging from sand to 4-inch rock. The four-section telescopic conveyor provides 106 feet 1 inch of horizontal reach with smooth, surge-free conveying. Unique butterﬂy outriggers make setup quick and easy in congested areas – even in rough terrain – making the TB 110 one of the industry’s most versatile units.

At Putzmeister, exceeding your expectations isn’t a goal – it’s mandatory.

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