Falling Weight Deflectometer (FWD) 1
Falling Weight Deflectometer (FWD) 1 : A vehicle mounted or towed device that records pavement surface deflection bowls at discrete test points on the pavement surface. Surface deflections are measured at distances ranging from 0 mm to a userdefined maximum (normally 1,500 mm) from the centre of an impulse test load, which is applied to the pavement surface through a standard loading plate normally 300 mm in diameter by a falling weight with a variable drop height while the FWD is at rest. FWDs are generally capable of imparting a load up to 150 kN
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