Download Performance Tests for Hot Mix Asphalt (HMA) Including by Louay Nadhim Mohammad, editor PDF

By Louay Nadhim Mohammad, editor

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Extra info for Performance Tests for Hot Mix Asphalt (HMA) Including Fundamental and Empirical Procedures (ASTM special technical publication, 1469)

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As an example, Performance Based APA Specifications were created for six Michigan regions in Fig. 5. As mentioned, a PBS based on APA data must include both a test length (in terms of APA cycles) and a failure rut depth criterion. The rut depth criterion is summarized first, followed by the test length. The failure criterion for an APA specimen was set at 7 mm based upon data gathered at WesTrack, but this criterion should be adjusted to consider APA testing variability. This rut criterion adjustment is based upon the following factors [13]: • • • • The level of confidence The variance or standard deviation The sample size The specification limit 28 PERFORMANCE TESTS FOR HOT MIX ASPHALT Newberry Superior West Superior East Grayling Iron Mountain North Midland GrandSouthwestern Bay Grand Rapids UniversityMetro Ann Arbor FIG.

This project’s mix designs were verified and used for testing in APA to determine the following: • The usefulness of the empirical model. • The effect that asphalt content and air voids has on APA performance. • A regression model to predict APA rut depth. • Perhaps most importantly, the APA data presented will be correlated with future inservice pavement performance to assess the APA’s usefulness in predicting the performance of HMA pavements. TABLE 4—Length of rutting seasons in each region. Region Superior West Superior East North Bay Grand-Southwestern University-Metro Dates of Rutting Season April 1–October 31 April 1–October 31 April 1–October 31 March 15–November 15 April 1–October 31 March 1–November 30 Length of Rutting Season, Days 214 214 214 246 214 275 30 PERFORMANCE TESTS FOR HOT MIX ASPHALT TABLE 5—A preliminary performance based APA specification.

AC Opt. 5 % Air Voids 18 289 (7 379) 11 264 (4 791) Project Name Average of All Projects Traffic Level 5 E 10 4% Opt. 5 % N/A Asphalt Content Opt. AC Opt. 5 % 20 498 (4 445) 16 086 (5 329) Average of All Projects Traffic Level 5 E 30 4% Opt. 5 % N/A Opt. AC Opt. 5 % 12 % 11 133 (6 150) 11 354 (3 450) 5 718 (1 479) 11 052 (3 410) 5 638 (2 949) N/A Air Voids Project Name Asphalt Content 8% 8% 12 % 15 999 (3 666) 14 388 (9 287) 10 043 (5 182) 7 472 (2 808) 5 055 (2 056) N/A Air Voids 16 068 (7 529) 13 308 (6 972) 8% 12 % 15 283 (11 801) 7 051 (2 996) 5 237 (1 928) 5 208 (1 522) 2 725 (571) N/A WILLIAMS ET AL.

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