关键词: 硅烷偶联剂;卵碎石;沥青;界面性能

Abstract: In order to improve adhesion ability between acidity egg crushed stone aggregate and asphalt, the asphalt was modified by silane coupling agent KH550.The penetration, ductility and softening point test were used to analyze the effect of coupling agent content on properties of asphalt.The interfacial interaction of coupling agent modified asphalt and egg crushed stone aggregate was studied by IR spectroscopy, asphalt-egg crushed stone powder interaction ability test, low temperature adhesion test and asphalt mixture moisture induced sensitivity test.Results show that CH2 significantly appears in the IR spectra of egg crushed stone powder treated by silane coupling agent, which proves that polysiloxane is formed on the surface of egg crushed stone under the action of coupling agent.The soft point of asphalt increases firstly and decreases finally with the dosage increasing of coupling agent.The ductility and penetration has a contrary law with the dosage increasing of coupling agent.The rutting factor G*/sinδ and interaction coefficient B of asphalt-egg crushed stone powder system are the best under the 0.6％ dosage of coupling agent, under which, the removal amount of egg crushed stones at low temperature is reduced by 50.7％.The residual splitting strength ratio of coupling agent modified asphalt mixture is increased by 7.9％ compared to unmodified asphalt mixture after moisture induced sensitive test.The interfacial property between the crushed stone and asphalt is significantly improved by silane coupling agent.

Key words: silane coupling agent;egg crushed stone;asphalt;interfacial performance