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选用SUP-19级配、泰普克改性沥青和PR.S添加剂作为材料,采用低温弯曲试验评价其低温性能。极限弯拉强度与极限弯拉应变的对比表明,采用强度和应变来评价混合料的低温性能出现了矛盾。主要原因是应变反映了变形能力,而根据混合料低温开裂的机理可以看出混合料出现裂缝是综合原因造成的,所以用能量法来评价是合理的。就应变能密度而言,其大小顺序为:掺加0.6%PR.S混合料>掺加0.4%PR.S混合料>未掺加混合料,且掺加PR.S的两种情况下的数值仅略大于未掺加的情况,说明掺加PR.S添加剂对混合料的低温性能有所改善,但对低温性能影响的差距并不如对高温性能影响的差距明显。
The grade of SUP-19, TPU modified asphalt and PR.S additive were selected as materials, and the low temperature bending test was used to evaluate their low temperature performance. A comparison of the ultimate flexural strength and the ultimate flexural strain shows that there is a conflict between the use of strength and strain to evaluate the low temperature properties of the mix. The main reason is that the strain reflects the deformation capacity. According to the mechanism of the low temperature cracking of the mixture, it can be seen that the cracks in the mixture are the comprehensive reasons. Therefore, it is reasonable to use the energy method to evaluate the deformation. In terms of strain energy density, the size order is: 0.6% PR.S admixture> 0.4% PR.S admixture> no admixture, and in both cases The value is only slightly larger than the unadulterated condition, indicating that the addition of PR.S additive has an improvement on the low temperature performance of the mixture, but the difference between the low temperature performance and the high temperature performance is not obvious.