Study On Shear Slip Performance And Impact Fatigue Performance Of Asphalt-Aggregate Interface

Compared with cement concrete pavement,asphalt pavement has many unique advantage,the technologies of asphalt and asphalt mixture are also increasingly mature.In the last ten years,asphalt pavement gradually replace cement concrete pavement and become the main road layer of China's highways and urban trunk lines.However,because of the increasing traffic volume?the increase of large heavy-duty vehicles and the serious traffic load,asphalt pavement also presents many diseases which can't be ignored In the operation period.The moisture damage.rutting and cracks have been tied for the "three"major diseases for the asphalt pavement.The adhesion of asphalt-aggregate interface is the intrinsic factor of the moisture damage of asphalt pavement.Water,traffic load and temperature and other factors are the external factors that induce moisture damage of asphalt pavement.In a sense,the impact fatigue performance of asphalt-aggregate interface,which reflects the asphalt-aggregate interface adhesion properties.After water treatment,the changes of the impact of fatigue performance reflect water stability performance of asphalt-aggregate interface.The thesis research the rheological properties of asphalt film in different influencing factors by using shear slip creep test loading system which my own researched and developed and DH3821 static strain testing system.The results show that it can improve the rheological properties of asphalt when we add a certain amount of natural asphalt into the matrix asphalt and the Albanian rock asphalt(ARA)improving effect is better than the Trinidad lake asphalt(TLA)with the same dosage.It also shows that the rheological properties of asphalt film in Asphalt mixture are not only related to asphalt properties,but also affected by aggregate properties.And water can reduce the cohesive force of asphalt film which is in the interface between asphalt and aggregate.The thesis research the impact fatigue resistance in different influencing factors by using the impact fatigue damage test loading system which my own researched and developed.The results show that the impact fatigue resistance of the interface between asphalt and aggregate are not only related to asphalt properties,but also affected by aggregate properties.On the whole,it can improve the impact fatigue resistance to some extent when we add low amount of natural asphalt into the matrix asphalt.The impact fatigue resistance will reduce rapidly with the increase of the amount of natural asphalt when the amount of natural asphalt is optimal.At the same time,the impact fatigue resistance is also affected significantly by water,kinds of rock and its surface structure.