Abstract: This study was to determine an appropriate layer coefficient for the Asphalt Concrete Hot Mix Base Course (ACHMBC) used by the Arkansas State Highway and Transportation Department (AHTD). Examination of the specifications for the material showed it to be superior to the asphalt stabilized base used in the AASHO Road Test. The coefficient estimated for the AASHO material was 0.34. Laboratory tests were conducted on ACHMBC cores from eight projects to determine typical resilient modulus and split tensile strength properties. Coefficients were estimated for each project from the resilient modulus data in the manner prescribed in the 1993 AASHTO Guide. These coefficients ranged from 0.36 to 0.52. Coefficients were also estimated using the AASHTO Guide method for determining the effective structural number (SN sub eff) for flexible pavement overlay design. These ranged from 0.34 to 0.40 with an average of 0.37. The split tensile strength data were evaluated using the AAMAS relative fatigue classification. This analysis found the ACHMBC from the projects sampled to be superior to the AASHO Road Test surface and binder mixes which were assigned coefficients of 0.44. The study recommends that a value of 0.36 be assigned as the layer coefficient for AHTD's ACHMBC.
Publication Year: 1995
Publication Date: 1995-08-01
Language: en
Type: article
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