An FWD is required as a testing apparatus for measuring the real properties of pavement. This is the nondestructive and non-intrusive method, and is generally chosen over other destructive assessment, because tests are not merely faster but also never entail removal of sidewalk material (Belt et ing.,2006). The relevant ASTM standard (ASTM D4694, 2006b) states the vehicle should be delivered to a stop with the loading plate positioned over the desired test location. The FWD process applies dynamic loads to some pavement surface, simulating the magnitude and duration on the single heavy moving steering wheel load. The peak deflections at each measured location are recorded in micrometers. The falling weight deflectometer (FWD) is probably the most commonly used nondestructive test (NDT) device utilised by highway agencies for sidewalk structural evaluation and health monitoring. The FWD simulates your moving truck wheel fill and measures the pavement response-deflection basin. The Falling Weight Deflectometer is a device which to evaluate pavement and pavement layer stiffness. It's a trailer-mounted device that manages by dropping a weight about the pavement and measuring the resulting pavement deflections. Various computations could possibly be performed on the deflection data to gauge the pavement and that stiffness of it and also its constituent layers. https://www.tbtscietech.com/Falling-weight-deflectometer-pl3404345.html