Title: A Study on the Quasi-static Backanalysis of Layer Properties of Flexible Pavement in Consideration of In-situ Temperature
Abstract: Most of the existing backcalculation program can't evaluate the dynamic effect of the deflection basin from the Falling Weight Deflectometer (FWD). Therefore the prototype of quasi-static backcalculation program has been developed, but it needs to be improved for expanding application on the four-layer asphalt concrete pavement with black base in Korea. To determined quasi-static correction factors, 20,412 models with various depths of bedrock are designed based on the parametric study. For all models, quasi-static surface deflections converted from dynamic surface deflections using quasi-static correction factors were compared with static surface deflections calculated by static analysis. Through the comparison study the accuracy and efficiency of quasi-static correction factors are verified. From the Multi-Depth Deflectometer (MDD) test results, it is found that improved backcalculation program gives the most reliable results when compared with results from several other computer codes in use. Backcalculated layer moduli are taken into account the effects of the seasonal and hourly temperature variations. To evaluate a pavement performance, the moduli of asphalt concrete layer predicted by field tests during the specific test periods must be converted into correction moduli with respect to reference temperature. In this study, the relationship between test temperatures and FWD backcalculated moduli is presented based on FWD test results at different temperature conditions. The temperature correction procedure is also suggested using the temperature-FWD backcalculated moduli relationship. Through the comparison study of the seasonal FWD test, it is shown that the relationship proposed in this study and the temperature correction procedure are valid and efficient.
Publication Year: 1999
Publication Date: 1999-01-01
Language: en
Type: article
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