DEVELOPMENT OF FRACTURE CRITERION FOR ASPHALT MIXES AT LOW TEMPERATURES

摘要: This paper describes the development and verification of a fracture criterion sensitive to elastic-plastic behavior asphalt concrete mixes. method is based on mechanics (EPFM) concept that leads laboratory determination critical strain energy release rate, also called value J integral, sub 1c. Also employed was linear elastic approach (LEFM), which stress intensity factor, toughness, K Asphalt beams 3 in. by 16 were tested under three-point bending. Notches 1/16 wide long enough so ratio notch depth beam always remained between 0.5 0.7 sawed at midpoint give single-edge geometry. A locally used mix design ID-2 employed. Twelve cements selected from around country for making Testing conducted four temperatures below 60 deg F (16 C): -5 (-21 C), 10 (-12 25 (-4 40 (4.0 C). Both EPFM LEFM approaches analyze data. The results compared with more routine tests, such as indirect tensile strength aspahlt mixes, well Fraass brittle point test, T PEN1.2, g DSC DMA cement. It found low (below C)) 1c characterization parameter properties. seems be related parameters. not grade or source.