Title: NON-DESTRUCTIVE TESTING : INTERPRETATION OF DEFLECTION BOWL FOR FALLING WEIGHT DEFLECTOMETER TESTS ON FLEXIBLE PAVEMENTS
Abstract: Non-destructive testing of pavement structures can be achieved by accurately measuring and interpreting deflection data. This paper describes a computer program designed for simple and fast processing of deflection data collected using a falling weight deflectometer (fwd). A set of diagnostic parameters are calculated: first, maximum horizontal strain in the asphalt concrete (ac) under the test load, directly via the corresponding maximum curvature; next, the elastic stiffness (or Young's modulus) of the subgrade; and finally, the vertical stress, strain and deflection on top of the subgrade, by means of an improved method of equivalent layer thickness. The actual stresses, strains, and deflections at test conditions can be normalized for standard ac temperature and standard test load. Diagnostic and design applications are discussed. Comparisons are made with parallel elastic layer analysis computations. (a)
Publication Year: 1988
Publication Date: 1988-01-01
Language: en
Type: article
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