![]() ![]() ![]() Also, the backcalculated moduli were compared to laboratory determined values. The backcalculated moduli obtained from different equipment for any test site were compared to each other. The backcalculation procedures used were BISDEF, MODCOMP2, and SEARCH. The deflection data collected using NDT devices were used to backcalculate pavement layers and subgrade moduli. A total of 27 project sites were studied. Samples of the pavement materials and subgrade were taken for evaluation in the laboratory using standard methods. Soil moisture cells were implanted in the subgrade to monitor the moisture content and temperature of the subgrade. Pavement surface deflection measurements were taken using three NDT devices, namely the Dynaflect, Road Raterand Falling Weight Deflectometer (FWD). This was achieved by the use of Nondestructive Testing Methods (NDT) and backcalculation techniques. This study involved the determination of the structural layer properties of aggregate and asphalt surfaced pavements for use in the evaluation of pavement load carrying capacity and the seasonal effects of moisture. Determination of Structural Layer Properties of Aggregate and Asphalt Surfaced RoadsÄetermination of Structural Layer Properties of Aggregate and Asphalt Surfaced Roads Book Description : ![]()
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