Abstract
AbstractFalling weight deflectometer (FWD) testing is commonly used to estimate subgrade resilient modulus (MR) by using back calculation and/or the AASHTO MR equation. Considering the availability of limited information in the pavement management information system (PMIS) database, the AASHTO MR approach is suitable for subgrade assessment at a network level because of its simplicity. An adjustment factor is commonly applied to the AASHTO MR equation because of the difference between laboratory-measured MR and estimated MR. However, large variations in the adjustment factor have been observed with different geographical locations and climate conditions. Thus, using a fixed value of the adjustment factor has led to inaccurate assessment of subgrade soil MR. This paper presents a methodology to improve the accuracy of the existing AASHTO MR equation by constructing an MR adjustment factor based on the correlation of back-calculated ER and AASHTO MR. This study also investigated the effects of subgrade soil...
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