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A Report on a Modification of the AASHO Road Test Serviceability Index Formula
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1963-01-01
[PDF-700.55 KB]
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Abstract:Use of the CHLOE profilometer in Texas indicated that this device for measuring road roughness tends to rank pavements having a coarse textured surface too low on the serviceability scale. To offset this tendency, a hand operated device for measuring coarseness of texture was developed, and a term for textural roughness was added to the AASHO Road Test formula for the serviceability index. The coefficient of the new term was evaluated by analysis of the subjective ratings given 43 flexible pavements by a 12-man panel of Texas highway engineers. A by-product of the study was the finding that the Texas engineers tended to rate at a lower level than the AASHO Road Test panel. To compensate, local ratings were adjusted upward 10 percent. The new formula for serviceability index predicted the adjusted ratings with satisfactory accuracy and will be used on this project for calculating the serviceability index for flexible pavements.
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