Application of FWD in Quality Control of Road Construction

Falling Weight Deflectometor(FWD) is the most advanced device in testing the deflection of pavement and the deflection-basin data from FWD testing can be used to backcalculate the modulus of pavement and valuate the performance of pavement. This paper analyses the advantage of FWD comparing with Benkelman Beam which is a traditional device and the good linear relativity between the two devices. Then the paper uses SIDMOD, a modulus backcalculation soft based on System Identification Method, to discuss the technology in using FWD to control the quality of road construction with actual projects. It is shows that FWD and the backcalculation of modulus of pavement can correctly reflect the quality of road construction and identify sections or structure layer of a road.