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High Performance Racetracks Good for a Racetrack, Good for a Highway?

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High Performance Racetracks Good for a Racetrack, Good for a Highway? High Performance Racetracks Good for a Racetrack, Good for a Highway? 38th Annual Rocky Mountain Asphalt Conference and Equipment Show Brian D. Prowell, Ph.D., P.E. Advanced Materials Services Collective Experience • Road Courses • Ovals – Daytona International* Miami-Homestead* – Portland International Richmond International* Raceway Martinsville Speedway* – Lime Rock Park Talladega Superspeedway* – Palm Beach International Darlington Raceway – Circuit Gilles Villeneuve Daytona International • Repair Speedway – Watkins Glen* – Phoenix International – Chicagoland ADVANCED *While working for NCAT MATERIALS – Summit Point SERVICES, LLC Design Concerns • Racetracks are about entertainment. What might be a small problem on a highway would be a disaster if it delayed a race • Smoothness • Durability – Resistance to raveling – Resistance to shoving – Resistance to cracking • Uniformity (texture etc.) ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Removed NASCAR, added last bullet, edited surface friction sub bullet Fan Excitement • A performance specification for a racetrack would provide for “fan excitement or driver entertainment” • Side-by-side racing, a function of: – Geometry – Surface friction (including rubber laydown) • The racing surface should not dictate the outcome of the race ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Good to add a race car picture to this slide Thoughts About Forces on a Racetrack Pavement • Not concerned about rutting like on a highway, port, or possibly an airport taxiway • Main concern is raveling • Lateral forces are greater on a road course or flat oval with less banking, like Indianapolis, than on a steeply banked oval, like Talladega • Down draft on cars produces suction under cars which can pull out loose chunks of pavement or manholes covers. ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Switched pictures upper left Raveling C/o A. Wilson ADVANCED MATERIALS SERVICES, LLC Transverse Joints Joint ADVANCED MATERIALS SERVICES, LLC Slippage ADVANCED MATERIALS SERVICES, LLC Typical Demolition • Take down all SAFERTM wall • Take down catch fence if banking exceeds 24 degrees • Light poles? • Remove asphalt and base if reconstructing • Mill ADVANCED MATERIALS SERVICES, LLC What is SAFERTM Wall? ADVANCED MATERIALS Courtesy of Elrod Corporation – Developed by University of Nebraska - LincolnSERVICES, LLC Demolition Grade and Compact ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Do you have a better milling picture from Miller? Milling ADVANCED MATERIALS SERVICES, LLC Scabs ADVANCED MATERIALS SERVICES, LLC Assess the milled surface ADVANCED MATERIALS SERVICES, LLC Weak Spots ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Modified thrid bullet Drainage, Drainage, Drainage • Drainage is important to the long-term performance of a track or any pavement • Some tracks are built in natural bowls, most tracks have paving behind the crash wall • Edge drains used to intercept water at the edge of the pavement, behind walls and at the toe of slopes • Drainage layer can be used to keep water from percolating through the surface of the ADVANCED MATERIALS SERVICES, LLC Poor Drainage? ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 new slide Deterioration Due to Water ADVANCED MATERIALS SERVICES, LLC Drainage Layer ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Added separation geotextile Typical Track Section 1.5 in. HMA Wearing Course 1.5 in. HMA Leveling Course 2.0 in. HMA Base Course Drainage Layer (optional) Aggregate Subbase Separation geotextile (?) Subgrade or embankment soil Brian Prowell 12/4/08 Added 3/8 inch to second major bullet Typical Surface Mix Design • Stiff Binder – PG 82-XX – XX depends on climate – 180 °F Softening Point – Elastic Recovery – ensure polymer modification • 9.5 mm (3/8 inch) NMAS Surface – Polish resistant aggregate – 75-Blow Marshall – Gradation close to maximum density line – Good in-place density! ADVANCED MATERIALS SERVICES, LLC Plant on Site or Close By (Ideally) Test Sections Required ADVANCED MATERIALS SERVICES, LLC Calibrate Nuclear Gauge ADVANCED MATERIALS SERVICES, LLC Bad Habits in the Test Section – Bad Habits on the Track ADVANCED MATERIALS SERVICES, LLC Begin Paving • Each lift is a dress rehearsal for the surface • Number of passes depends on geometry – Want to minimize longitudinal joints – Road courses can be paved in echelon – might not be best choice – More passes may be needed to minimize grade change at hinge points on ovals • Check smoothness after each lift • Grind or precision mill as necessary • Goal is a perfect surface! ADVANCED MATERIALS SERVICES, LLC Mix Generally Has to be Hauled Through Tunnel as Paving Progresses ADVANCED MATERIALS SERVICES, LLC Getting Mix to the Paver – A Challenge on Ovals Slat Conveyor ADVANCED MATERIALS SERVICES, LLC Tamping Bar Screed Paver • Can obtain up to 90% Gmm directly behind screed • Minimizes roll down – 1/8 inch per inch instead of typical ¼ inch per inch • Less roll down = smoother pavement ADVANCED MATERIALS SERVICES, LLC Smoothness • Grade Control – 3 dimensions in curves • String lines sometimes used • Surface placed with paver on automatic – Uniform thickness – Ski with bridge to new mat – Tamping bar screed – minimizes roll down – Stable mix ADVANCED MATERIALS SERVICES, LLC Cut/fill every 10 Feet in curves ADVANCED MATERIALS SERVICES, LLC Tack ADVANCED MATERIALS SERVICES, LLC Pave to String Line Precision Mill Leveling Come off Shims ADVANCED MATERIALS SERVICES, LLC Ski with Reference to New Mat ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Added title Typical Paving Train You can’t pave 40 feet wide in a single pass! ADVANCED MATERIALS SERVICES, LLC Longitudinal Joints • A weak point in a racetrack pavement as well as a highway pavement • Options – Paving in echelon - generally not possible on ovals – Stagger joints between lifts – Cut back joints • Saw • Cutting wheel ADVANCED – Joint sealant MATERIALS SERVICES, LLC Longitudinal Joints • A weak point in a racetrack pavement as well as a highway pavement • Options – Paving in echelon - generally not possible on ovals – Stagger joints between lifts – Cut back joints • Saw • Cutting wheel ADVANCED – Joint sealant MATERIALS SERVICES, LLC Paving in Echelon ADVANCED MATERIALS SERVICES, LLC Cut Back Joint ADVANCED MATERIALS SERVICES, LLC Rolling 6 in. off the joint – ADVANCED MATERIALS SERVICES, LLC Bad Joint after Good Joint a few months after 3 years ADVANCED MATERIALS SERVICES, LLC ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/4/08 Added quote about best designed mix Proper Compaction is a Must! “The best designed mix in the world, poorly constructed, will not perform as well as a lower quality mix constructed well.” ADVANCED MATERIALS SERVICES, LLC ADVANCED MATERIALS SERVICES, LLC ADVANCED MATERIALS SERVICES, LLC 18 – 24 degrees – Support from below ADVANCED MATERIALS SERVICES, LLC > 24 degrees, suspend from above ADVANCED MATERIALS SERVICES, LLC Improper support ADVANCED MATERIALS SERVICES, LLC Compaction Against Wall ADVANCED MATERIALS SERVICES, LLC ADVANCED MATERIALS Courtesy of Danny James SERVICES, LLC Seal Joint with Crash Wall ADVANCED MATERIALS SERVICES, LLC Like on a highway, you need ADVANCED MATERIALS SERVICES, LLC Density on Base And Leveling Monitored with gauge, accepted with cores ADVANCED MATERIALS SERVICES, LLC QA Density Talladega Nuclear Gauge Avg. Mat = 94.2% Gmm Avg. Joint = 92.1% Gmm Darlington January 12, 2008 Avg. Density: Cores 93.9% Gmm Gauge 93.7% G ADVANCED mm MATERIALS SERVICES, LLC Put Curbs in After Asphalt Finished Asphalt higher than curb ADVANCED MATERIALS SERVICES, LLC Attention to Detail ADVANCED MATERIALS SERVICES, LLC Attention to Detail ADVANCED MATERIALS SERVICES, LLC Brian Prowell 12/5/08 Fly in picture with foot and oval Attention to Detail Immediately after rolling Different track after one year ADVANCED MATERIALS SERVICES, LLC Attention to Detail ADVANCED MATERIALS SERVICES, LLC Testing ADVANCED MATERIALS SERVICES, LLC What Do You Need to Pave a Racetrack? ADVANCED MATERIALS SERVICES, LLC Thanks! Brian Prowell Advanced Materials Services, LLC 2515 E. Glenn Ave., Suite 107 Auburn, AL 36830 (334) 246-4428 [email protected] ADVANCED MATERIALS SERVICES, LLC.
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