Abstract: The coal gangue is one of the largest industrial solid waste emissions in our country. Up to now, there is few research results about coal gangue′s activation in order to improve the performance of asphalt. In this article, dynamic shear rheological test (DSR), bending beam rheometer (BBR) and brook-field viscometer test (BV) were used to study the high and low temperature performance of asphalt mortar which was made of limestone slag and three types of activated coal gangue. The relationship between Eμ (viscous part of repeated creep stiffness) or S (creep stiffness) and filler-bitumen ratio was analyzed. Through rheological method and double linear simplified model, reasonable range and optimum point of filler-bitumen ratio of activated coal gangue modified asphalt were set forth. With the application of scanning electron microscope(SEM) and infrared-ray spectroscopy(IR), the reinforcing mechanism of coal gangue compound mineral fiber was researched. The results show that the identified filler-bitumen ratio of activated coal gangue modified asphalt mortar can balance the high and low temperature performance well. The activated coal gangue has better effect on the improvement of thermosensitivity of asphalt mortar than mineral powder due to its smaller mean grain size, bigger specific surface area and porous surface. The results will contribute to the resource utilization of abandoned coal in the asphalt pavement engineering.
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