Title: ESTIMATION OF LAYER COEFFICIENTS OF BOUND LAYERS FOR FLEXIBLE PAVEMENT DESIGN IN RHODE ISLAND
Abstract: The American Association of State Highway and Transportation Officials (AASHTO) published the Guide for Design of Pavement Structures (AASHTO Guide) in 1986 and revised it in 1993. Since pavement layer coefficients had been identified as an essential parameter in the AASHTO Guide, layer coefficients in Rhode Island were estimated by the direct method using the resilient modulus values for Hot Mix Asphalt (HMA). In order to determine resilient moduli of HMAs, specimens were prepared with the Marshall mix-design method currently used by the Rhode Island Department of Transportation (RIDOT). A series of resilient modulus tests were performed on twelve HMAs prepared with the Optimum Asphalt Contents (OACs) and secured from five sites. The ASTM Designation D4123 was used with 20% of tensile strength as loading magnitude and 0.5 Hz loading frequency. The preliminary coefficients recommended are 0.40 for the Class I-1, 0.42 for the modified binder, and 0.43 for the modified base. If all bound layers are to be considered as one layer, the preliminary coefficient of 0.41 is recommended for use in Rhode Island. To verify laboratory test results, the Falling Weight Deflectometer (FWD) testing was also performed at three sites over a one year period. It was observed that backcalculated moduli based on FWD deflection data were much higher than laboratory determined ones.
Publication Year: 1994
Publication Date: 1994-11-01
Language: en
Type: article
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Cited By Count: 4
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