INFLUENCE OF LOADING WAVEFORM OF FWD ON STRUCTURAL ANALYSIS OF ASPHALT PAVEMENTS

FWD (Falling Weight Deflectometer) is a nondestructive testing equipment used worldwidely for pavement structural evaluation. Many manufacturers developed various types of FWD equipment which have almost identical peak loads. However, diversity can be found in the other specifications, and this may cause difference in measured deflections and pavement layer moduli backcalculated based on them. Pavement surface deflections are measured in this study, varying weight and height of falling mass and type of rubber buffer of an FWD (manufactured by Phoenix Road International Co., Ltd.), so that various loading waveforms can be obtained, keeping the peak load almost identical. And influence of loading waveform of FWD on backcalculated pavement layer moduli is examined.