Study on Interfacial Adhesion of Asphalt Aggregate Based on Indirect Tensile Test
In order to study the interface bonding properties of asphalt and aggregate,70#matrix as-phalt and SBS modified asphalt mixture were selected to perform indirect tensile tests under different temperature,aging and moisture conditions.The bonding properties between asphalt and aggregate were characterized by analyzing their peak force,fracture energy and cracking tolerance index(CT),and the influence characteristics of various influencing factors on asphalt and aggregate were revealed.The results show that the peak force of asphalt mixture decreases with the increase of temperature,but the fracture energy and CT index increase with the increase of temperature.Temperature essen-tially changes the viscoelastic properties of asphalt,and thus the interface bonding properties of as-phalt and aggregate change significantly.With the increasing degree of aging,the peak force of as-phalt mixture increases while the fracture energy and CT index decrease.Under the condition of long-term aging,the peak force of 70#matrix asphalt and SBS modified asphalt increases by 31.1%and 15.4%respectively,while the fracture energy decreases by 27.6%and 19.1%respectively.Aging improves the bond strength of asphalt mixture,but the cracking resistance and ductility are weak-ened.After long-term high temperature water soaking treatment,the peak force,fracture energy and CT index of asphalt mixture are decreased significantly.After four days of high temperature water soaking,the peak force of 70#matrix asphalt and SBS modified asphalt mixture are decreased by 48.2%and 33.1%,and the CT index is decreased by 67.7%and 32.5%,respectively.Water intru-sion into the bituminous aggregate interface results in the stripping of the asphalt film,which serious-ly affects the cohesiveness of the bituminous aggregate interface.
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