By Louay Nadhim Mohammad, editor

ISBN-10: 0803134959

ISBN-13: 9780803134959

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

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If a pavement has been poorly compacted, the resulting decrease in pavement performance would be shown by decreased APA performance. Statistical Analysis of the APA Cycles to Failure Results Presently, most if not all state highway agencies that use the APA in HMA specifications use a pass/fail rut criterion to differentiate between rut resistant and rut prone HMA mixtures. The empirical model developed previously converts the amount of APA cycles needed to reach a failure APA rut depth to the ESALs needed to cause a pavement rutting failure.

The problem is the variability about the means. The standard deviations are consistently large throughout most of the APA results. Duncan’s multiple range method of comparing means is sensitive to these large standard deviations, and thus it is difficult to statistically demonstrate that the means are different. One way to decrease the variability is to increase the sample size by creating and testing more APA specimens. However, this may not be economical since procuring and testing APA specimens is both timely and costly.

5 %). This does lend credibility to the APA since high asphalt contents decrease stability in HMA mixtures. But since it only occurred for three out of ten projects, it is concluded, in general, that the APA rut depth at 8000 cycles is not statistically affected by changing asphalt content. 5 % from optimum asphalt content. On the other hand, it could be possible that the APA is sensitive to changes in asphalt content. , they exhibit the same rut performance at all three of the asphalt WILLIAMS ET AL.

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Performance Tests for Hot Mix Asphalt (HMA) Including Fundamental and Empirical Procedures (ASTM special technical publication, 1469) by Louay Nadhim Mohammad, editor

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