Application of drop weight deflection meter in road construction quality control

Drop weight deflector;  Beckman Beams;  deflection basin;  modulus;  Reverse calculation;  Quality control

Drop weight deflection meter (FWD) is the most advanced pavement deflection detection equipment in the world, using FWD to detect deflection basin data can reverse calculate the modulus of the pavement structural layer, and then evaluate the pavement condition. Based on the analysis of the superiority of FWD compared with traditional deflection detection equipment Beckmann beam and the linear correlation between the two, the application technology of road construction quality control by FWD deflection detection is discussed by using SIDMOD, a modulus inverse software based on the principle of system identification, combined with specific engineering practice. Practice shows that during road construction, FWD deflection detection technology combined with the modulus inversion theory of pavement structural layer can truly reflect the actual construction quality of the road, and identify the road sections and structural layers with problems or hidden dangers in the construction quality.