High Performance Racetracks
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1 High Performance Racetracks Good for a Racetrack, Good for a Highway? 38 th Annual Rocky Mountain Asphalt Conference and Equipment Show Brian D. Prowell, Ph.D., P.E.
2 Road Courses Advanced Materials Services Daytona International* Portland International Raceway Lime Rock Park Palm Beach International Circuit Gilles Villeneuve Repair Watkins Glen* Phoenix International Chicagoland Summit Point Collective Experience Ovals Miami-Homestead* Richmond International* Martinsville Speedway* Talladega Superspeedway* Darlington Raceway Daytona International Speedway *While working for NCAT
3 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.)
4 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
5 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.
6 Brian Prowell 12/4/08 Switched pictures upper left Raveling C/o A. Wilson
7 Transverse Joints Joint
8 Slippage
9 Typical Demolition Take down all SAFER TM wall Take down catch fence if banking exceeds 24 degrees Light poles? Remove asphalt and base if reconstructing Mill
10 What is SAFER TM Wall? Courtesy of Elrod Corporation Developed by University of Nebraska - Lincoln
11 Demolition
12 Grade and Compact
13 Brian Prowell 12/4/08 Do you have a better milling picture from Miller? Milling
14 Scabs
15 Assess the milled surface
16 Weak Spots
17 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
18 Poor Drainage?
19 Brian Prowell 12/4/08 new slide Deterioration Due to Water
20 Drainage Layer
21 Brian Prowell 12/4/08 Added separation geotextile 1.5 in. 1.5 in. 2.0 in. Typical Track Section HMA Wearing Course HMA Leveling Course HMA Base Course Drainage Layer (optional) Aggregate Subbase Separation geotextile (?) Subgrade or embankment soil
22 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!
23 Plant on Site or Close By (Ideally)
24 Test Sections Required
25 Calibrate Nuclear Gauge
26 Bad Habits in the Test Section Bad Habits on the Track
27 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!
28 Mix Generally Has to be Hauled Through Tunnel as Paving Progresses
29 Getting Mix to the Paver A Challenge on Ovals Slat Conveyor
30 Tamping Bar Screed Paver Can obtain up to 90% G mm directly behind screed Minimizes roll down 1/8 inch per inch instead of typical ¼ inch per inch Less roll down = smoother pavement
31 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
32 Cut/fill every 10 Feet in curves
33 Tack
34 Pave to String Line
35 Precision Mill Leveling
36 Come off Shims
37 Ski with Reference to New Mat
38 Brian Prowell 12/4/08 Added title Typical Paving Train
39 You can t pave 40 feet wide in a single pass!
40 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 Joint sealant
41 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 Joint sealant
42 Paving in Echelon
43 Cut Back Joint
44 Rolling 6 in. off the joint
45 Bad Joint after a few months Good Joint after 3 years
46
47 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.
48
49
50 18 24 degrees Support from below
51 > 24 degrees, suspend from above
52 Improper support
53 Compaction Against Wall
54 Courtesy of Danny James
55 Seal Joint with Crash Wall
56 Like on a highway, you need
57 Density on Base And Leveling Monitored with gauge, accepted with cores
58 QA Density Talladega Nuclear Gauge Avg. Mat = 94.2% G mm Avg. Joint = 92.1% G mm Darlington January 12, 2008 Avg. Density: Cores 93.9% G mm Gauge 93.7% G mm
59 Put Curbs in After Asphalt Finished Asphalt higher than curb
60 Attention to Detail
61 Attention to Detail
62 Brian Prowell 12/5/08 Fly in picture with foot and oval Attention to Detail Immediately after rolling Different track after one year
63 Attention to Detail
64 Testing
65 What Do You Need to Pave a Racetrack?
66 Thanks! Brian Prowell Advanced Materials Services, LLC 2515 E. Glenn Ave., Suite 107 Auburn, AL (334)
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