Title: FULL-DEPTH ASPHALT PAVEMENT FATIGUE UNDER ACCELERATED LOADING: THE MULGRAVE (VICTORIA) ALF TRIAL, 1989/1991
Abstract: This report describes the recent Accelerated Loading Facility (ALF) trial conducted in Australia on full depth asphalt pavements nominally 120 mm thick. The aim of the trial was to investigate the fatigue performance of dense-graded asphalt. Extensive laboratory and field testing was conducted to complement the ALF trial. Relationships were established between back-calculated asphalt stiffness, determined from Falling Weight Deflectometer (FWD) deflection bowls, pavement temperature and the severity and extent of surface cracking. The stiffness was found to decrease markedly with increase in the number of loading cycles before surface cracking was apparent. Fatigue relationships, derived from various extents and severities of surface cracking, suggested that, for the trial mix tested under ALF loading, the Shell fatigue relationship was associated with about 50% of the loaded areas having severe fatigue cracking. Relationships were derived between the Curvature Function (D(sub)0 - D(sub)200), measured with the FWD at 25 degrees C, and asphalt fatigue life for various severities of pavement cracking. The adjustment factors decreased with increasing severity of cracking. The results will be of interest in the current revision of the Australian Pavement Thickness Design Guide.
Publication Year: 1992
Publication Date: 1992-06-01
Language: en
Type: article
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Cited By Count: 3
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