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The modification mechanism and high temperature deformation law are obtained by the rutting test of the same matrix asphalt and aggregate gradation with different natural asphalt mixture. It proves that the anti-rutting performance of the asphalt mixture with Iran rock is close to that of SBS modified asphalt mixture.

To evaluate the high temperature properties and rheological behavior of Iranian Rock Asphalt(IRA), convectional test and temperature scanning test over modified asphalt containing A-70 asphalt as base asphalt and IRA as different amount were conducted. The results show 1) an increase in asphalt binder’s capability of deformation resistance under high temperature, decreases both in asphalt binder’s temperature sensitivity and low-temperature performance; 2)an increase in anti-rutting factor, a decrease on loss tangent value, an improvement of dynamic viscosity. Thus the asphalt binder’s high temperature performance is greatly improved and anti-rutting capability strengthened.

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