نوع مقاله : علمی - پژوهشی
چکیده
کلیدواژهها
عنوان مقاله [English]
In structural evaluation of asphalt pavement using FWD device, the depth temperature of asphalt layer was measured to analyze deflection data in reference temperature by means of correction coefficients. In addition to direct measurement of the temperature during the test, also some models were developed to predict asphalt layer depth temperature. AASHTO graph and Bells model are the most common of them. The main goal of this research is to evaluate Bells model to predict the asphalt layer depth temperature. So, 10 pavement sections of Kerman and Khuzestan provinces were selected and the temperature was measured in half and one-third depth of asphalt layer and also required data were gathered to use Bells model. To comprehensive evaluated of Bells model, various asphalt layer thicknesses of old and new constructed pavements were considered and depth temperature was measured in every 30 minutes of day. Linear regression analysis of Bells model versus measured depth temperature with R2=0.85 indicated that Bells model need to calibration to increase accuracy. More evaluation specified that the main reason of R2 decreasing in selected sections was the existence of new constructed asphalt pavements because determination coefficient of depth temperature based on Bells model and measured temperature in old pavements is equal 0.96. So Bells model for new constructed pavements was calibrated and corrected model was presented.
کلیدواژهها [English]
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