Re-con Zero.pdf 1 5/22/2013 9:15:33 AM S S I I N N G G A A P P O O R R E E C C O O N N C C R R E E T T E E I I N N S S T T I I T T U U T T Returned Concrete at Zero Impact E E STEP STEP 1155 NNOOVV 1133 •• MMIICCAA ((PP)) NNoo.. 005511//OO99//22001133 VVooll 55 NNoo 11 Component B Component A 6 kg/m3 3 Mix for 0.5 kg/m 3 minutes Mix for 1 kg 1 kg 1 kg 4 minutes 0.5 kg 1 kg 1 kg 1 kg C M S S C C I I Y C C O O N N STEP C C R R CM E E T T U U S S MY • • CONCRETE V V o o l l CY 5 5 N N o o 1 1 CMY K DISCHARGE RE-CON ZERØ The innovative product for the sustainable recovery of returned concrete • No waste produced • Added directly into the truck mixer • No treatment plants required • Re-usable aggregate for concrete • Minimize environment impact 1 1 5 5 N N • Reduce overall operating cost O O V V 1 1 3 3 • • Discover our world of Mapei: www.mapei.com.sg M M I I C C A A ( ( P P ) ) N N Mapei Far East Pte Ltd o o . 28 Tuas West Road, Singapore 638383 0 0 SSIINNGGAAPPOORREE 5 5 1 1 Tel: +65 68623488 Fax: +65 68621012/13 / / 0 0 9 9 CCOONNCCRREETTEE Website: www.mapei.com.sg Email: [email protected] / / 2 2 0 0 1 1 3 3 IINNSSTTIITTUUTTEE CONTENTS PRESIDENT’S MESSAGE 2 BOARD OF DIRECTORS 2013/2014 3 CATEGORY 1: CONCRETE TECHNOLOGIES AND STANDARDS • If Concrete Can Speak – Health Testing 4 • Thermal behaviour of concrete mixes with diff erent pozzolanic additions 5 SCI Concretus CATEGORY 2: STRUCTURAL HEALTH MONITORING, TESTING AND REPAIR Issue 5.1 Nov 2013 • Investigation and Repair Advisory Services 10 www.SCI-Concretus.com • SilverSchmidt Hammer 13 Honorary Chief Editor • DY‐2 Family Pull-off Tester 13 Dr. Tam Chat Tim Editors Er Oh Lock Soon CATEGORY 3: READY MIX AND CONCRETE ADMIXTURES Prof. Gary Ong • Pan-United Concrete 14 Mr. Willie Kay Mr. Tan Yew Meng • The revolution in protecting sewage treatment structures 18 Prof. Zhang Min Hong Dr. Bahador Sabet Divsholi • New Technology in sump excavation 21 Prof. Susanto Teng • NitCal™ 22 Prof. Yang Yaowen Mr. Fong Weng Khiong CATEGORY 4: CONSTRUCTION TECHNOLOGIES Content Manager • Panama: mapei is there in the doubling of the canal 26 Adel Emadzadeh • Excel precast pte ltd “we deliver promises” 32 Design & Creative Services Lu Zhenming • 10% Cost Saving on Singapore’s Biggest Tunnel 36 Angeline Lee Sam Yang SCI ACTIVITIES (NOVEMBER 2012-OCTOBER 2013) Production Director • th 38 Dr. Bahador Sabet Divsholi 34 SCI Anniversary Gala Dinner Theme: “Sustainable Concrete Innovation” • SCI Excellence award- Innovators 2012: The world’s fi rst Multi-Storey Aircraft For Advertising enquiries, contact Edina Koh Carousel Storage & Parking System 40 [email protected] • SCI Excellence award-Innovators 2012: FerroLite partition wall 42 Tel: 6552 0674 • SCI Excellence award- Builders 2012: Design and build a SRC Seawater Intake Relocation Project for Singapore Refi ning Co Pte Ltd. 44 SCI Concretus Magazine • SCI Excellence award- Builders 2012: GMR Energy 2x400 Mw CCP Project Published by : – Off shore Civil Package 46 SINGAPORE WATERPROOFING ACCREDITATION SCHEME 52 CONCRETE INSTITUTE ACCREDITED WATERPROOFING FIRMS 53 SINGAPORE CONCRETE INSTITUTE Blk 342 Ang Mo Kio Ave 1 #03-1563 Singapore 560342 SCI WATERPROOFING EXCELLENCE AWARD 54 Telephone : (65)-65520674 Fax: (65)-65520417 www.scinst.org.sg PRECASTER ACCREDITATION SCHEME 55 Printed by EZRA Print & Pack Pte Ltd, 107 UPCOMING OWICs CONFERENCE 56 Neythal Rd, Singapore 628595 Cover image courtesy of Tuas Plant, HL Building Materials SCI MEMBERSHIP APPLICATION FORM 57 Pte Ltd NOTE : SCI MEMBERSHIP 59 SCI Concretus welcomes articles relating to use of Concrete in its various forms. Publication is at the discretion of the Editorial Board. The views DIRECTORY LISTINGS 60 expressed are not necessarily those of Singapore Concrete Institute. While care has been taken to ensure that the information contained in this magazine is accurate, SCI assume no responsibil- ity for any errors in or misrepresentation of such information, neither for any loss or damage. SSCICI CCONCRETUSONCRETUS 1 No part of this publication can be reproduced without the express written permission of Singa- pore Concrete Institute. President’s Message In conjunction with our 35th Anniversary Celebration of Singapore Concrete Institute this year, the publication of the sixth issue of the Concretus refl ect importance of precast industry for sustainable construction in Singapore. The theme of this year’s celebration, “Sustainable Precast Concrete in Singapore” is to reinforce the importance of sustainable construction as well as speed and quality of construction. The concern of all stakeholders in the construction industry on the subject of precast construction is well refl ected in current issue of SCI Concretus. Our readers should fi nd these articles a timely update on the various developments to address the need for sustainable precast industry in Singapore. This year, we have the pleasure of a special guest: DR ALFRED A. YEE a promi- nent engineer who has contributed much to Singapore’s building and construction industry. Dr Yee has also been an advisor to HDB since the ‘80s where he introduced precast technology in public housing. We are privileged to have Dr Yee to deliver a speech on ‘MY LIFE IN PRECAST CONCRETE”. The SCI Excellence Awards 2013 and the inaugural SCI Waterproofi ng Excellence Award will add to the celebration this year and assure the continuous innovation and improvement of construction quality in Singapore. On behalf of the SCI Board of Directors, I would like to thank all our sponsors, SCI members, partners and supporters for the continuous support in providing generous fi nancial contributions and technical knowledge towards the publication of Concretus. We look forward to your continuous support in making the Concretus a useful resource for the benefi ts of all our esteemed readers. Thank you. Er Koh Beng Thong President Singapore Concrete Institute 15 November 2013 2 SSCICI CCONCRETUSONCRETUS SINGAPORE Board of Directors CONCRETE INSTITUTE 2013/2014 PRESIDENT 1ST VICE PRESIDENT 2ND VICE PRESIDENT Er Koh Beng Thong Er Tan Yew Meng Dr Sabet Divsholi Bahador Director Director Senior Structural Engineer – Healthcare Infrastructure School of Communication, Arts and Concrete Specialist Projects Div Social Sciences PRECAST DESIGN MOH HOLDINGS PTE LTD SINGAPORE POLYTECHNIC CONSULTANTS PTE LTD HON SECRETARY HON TREASURER ASST HON SECRETARY ASST HON TREASURER Ms Chen Hong Fang Mr Fong Weng Khiong Mr Tan Sze Tiong Mr Alvin Chan Technical Sales Manager Director Deputy Director (Environmental & General Manager Kerneos Asia Pacifi c Pte Ltd Ascent Facilities Engineering Pte Ltd Building Performance Research) PAN-UNITED CONCRETE HDB Building & Research Institute PTE LTD HOUSING & DEVELOPMENT BOARD IMMEDIATE PAST DIRECTOR DIRECTOR DIRECTOR PRESIDENT Prof Zhang Min-Hong Er Vickneson Ulaganathan Ms Catherine Wong Phui Chan Er Oh Lock Soon Professor Deputy Director, Asset Senior Manager Managing Director Dept of Civil and Environmental Engineering Management(Infrastructure) SETSCO SERVICES PTE LTD KEPPEL THAI PROPERTIES NATIONAL UNIVERSITY OF LAND TRANSPORT PUBLIC CO LTD SINGAPORE AUTHORITY DIRECTOR DIRECTOR DIRECTOR DIRECTOR Er Chang Heng Choy Mr Tony Tan Mr Woo Sek Han Ms Jianying Yang Principal Engineer General Manager Business Development Manager Senior Manager, Admixture Systems, Building Engineering Group HL BUILDING MATERIALS FUZI BUILDING SOLUTION Malaysia & Singapore BUILDING & CONSTRUCTION PTE LTD PTE LTD BASF SOUTH EAST ASIA AUTHORITY PTE LTD SSCICI CCONCRETUSONCRETUS 3 Category 1: Concrete Technologies and Standards IF CONCRETE CAN SPEAK – HEALTH TESTING Dr Tam Chat Tim Associate Professorial Fellow Department of Civil & Environmental Engineering National University of Singapore ealth check is desirable for living beings, ples (BS EN 12504-1: 2000 [3]) or by indirect tests particularly at old age or when one’s for which a correlation is required. A minimum Hhealth is in doubt. How above health number of cores are still required as provided for check for me, Concrete? There are many existing in order to establish a reliable correlation curve by testing methods that can indicate my ability to per- one of the two alternative methods specifi ed. The form, e.g. at my early age (fresh state), and at later three indirect test methods are the rebound ham- age (hardened state). The types of performance in- mer test (BS EN 20504-2: 2001 [4]), the ultrasonic clude amongst others, how freely I can move (con- pulse velocity test (BS EN 12504-4: 2004 [5]) and sistence), how long do I take to change from fl uid the pull-out test (BS EN 12504-3: 2005 [6]). to solid (setting times), how fast and strong can I become (strength development), how I respond to The guidance for accepting a reduction in the par- stress (modulus of elasticity, creep), to common en- tial factor of safety for concrete from the design References: vironment (temperature, relative humidity) and to value of 1.5 to 1.2 (or other appropriate factor extreme cases (freeze-thaw, fi re, chemical attack). considered suitable in particular circumstances) 1. BS 6089: 1981, Guide to assessment of concrete Of course, I may also have inherent defects in my given in BS 6089: 1981 is now replaced with the strength is existing structures, British Standards In- DNA (e.g. alkali-aggregate reaction) and resultant required ratio of 0.85 for minimum characteristic stitution, London. effect of higher than usual temperature (DEF). in-situ compressive strength to the characteristic 2.