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Applications are presented of an improved closed-form backcalculation procedure for slab-on-grade concrete pavement systems. A choice is now possible from among several popular plate-sensor arrangements, involving the 300 or 450 mm dia. plate, with four or seven sensors, as well as the irregular sensor spacings arrangement used by the Strategic Highway Research Program. Based on experience from several projects, user guidelines are formulated.
backcalculation, k-value, concrete pavements, nondestructive testing, Falling Weight Deflectometer, data interpretation
Engineering Consultant, Savoy, IL