Structural Value of Asphalt Treated Permeable Base and Open Graded Asphalt Concrete

摘要

The results of a California Department of Transportation study to evaluate the structural properties of asphalt treated permeable base (ATPB) and open graded asphalt concrete (OGAC) are presented. Both laboratory and field investigations were used to determine the stiffness of ATPB and OGAC. The field investigation consisted of using Dynaflect deflection measurements before and after placement of an ATPB layer and comparing the percentage change in deflection to a section of pavement without ATPB. The results of these measurements show that the ATPB has a gravel equivalent factor equal to that of a dense graded AC pavement. Laboratory testing included both resilient modulus and R-value. The results from the resilient modulus tests show the modulus to average 141,000 psi for ATPB and 156,000 psi for OGAC. The results from the R-value tests were not used due to the low values obtained which were not consistent with the conclusions from the resilient modulus tests and the Dynaflect deflection measurements.