Abstract
Asphalt roadways are typically designed to be resurfaced with an asphalt overlay every ten years. The thickness of an asphalt overlay is related to the structural strength of the existing pavement however, currently there are no methods to accurately determine the in-place structural capacity. This study investigates six Kansas roadways to determine how the pavement modulus can be evaluated nondestructively. Cores were taken from each roadway for Indirect Tension testing in the lab to determine the resilient modulus of each asphalt layer in the pavement. Two in-situ non-destructive tests, Falling Weight Deflectometer (FWD) and Portable Seismic Pavement Analyzer (PSPA), were also conducted on each roadway. The FWD and PSPA tests are much faster and less expensive than the laboratory tests. Therefore, relationships were explored to convert the FWD and PSPA moduli to the resilient modulus obtained by the Indirect Tension test. However, no universal correlation was found but the FWD results would yield the most conservative design.
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