中文摘要：

对一种基质沥青和3种硅藻土沥青进行了差示热扫描分析，并结合相应的混合料约束试件的温度应力试验分析了硅藻土沥青的低温抗裂机理．结果表明：硅藻土沥青有优于基质沥青的低温性能；玻璃态转化温度可以较好地反映硅藻土沥青的低温性能；玻璃态转化温度与破断温度有较高的相关性．另外还进行了相应的4种沥青混合料的低温弯曲试验、低温压缩试验和收缩系数试验．结果表明：硅藻土沥青混合料的低温性能优于基质沥青混合料；硅藻土沥青混合料临界弯曲应变能密度及压缩应变能密度均大于基质沥青混合料；沥青混合料加入硅藻土后收缩系数降低．在此基础上，从混合料收缩性能和破坏能量2个角度分析了硅藻土沥青混合料的低温抗裂机理．

英文摘要：

A kind of neat asphalt and three kinds of diatomite asphalt are tested using differential scanning calorimetry（DSC）. The anti-cracking mechanism of diatomite asphalt is analyzed by DSC and the thermal stress restrained specimen test（TSRST） of the asphalt mixtures. The results show that the low temperature performance of diatomite asphalt is better than that of neat asphalt. The glass transition temperature can reflect the low temperature performance of the diatomite asphalt better and has a good relationship with breaking temperatures. Besides, the TSRST, the bending test, the compressing test and the contraction coefficient test are used to study the low temperature performance of the diatomite asphalt mixture. The results prove that the low temperature performance of the diatomite asphalt mixture is better than that of the neat asphalt mixture. The critical bending strain energy density and the compressing strain energy density of the diatomite asphalt mixture are greater than those of the neat asphalt mixture. After adding diatomite to the asphalt mixture, the contraction coefficient is reduced. Based on the above results, the anti-cracking mechanism of the diatomite asphalt mixture is analyzed from the angle of contraction performance and breaking energy.