Abstract
This paper deals with the implementation and comparison of the falling weight deflectometer (FWD) and Benkelman Beam (BB) for pavement evaluation. Field measurements were made at an in-service pavement A30 in Shanghai, China. Based on the deflections measured by FWD and BB, the exact relation between the results of FWD and BB was established. The modulus of the subgrade was back-calculated with MODULUS, and the ratio of E(sta) and MR(dyn) was consistent with the suggestion of AASHTO 1993. Due to the fact that FWD test is very convenient and rapid, it indicates that FWD is an appropriate device for the pavement structural evaluation and the selection of optimal pavement rehabilitation strategy. It is believed that the dynamic modulus back-calculated from FWD test results can be used as a stiffness modulus for the subgrade of new pavement construction in China.
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