Experimental study on thermophysical properties of HMA during compaction
Experimental study on thermophysical properties of HMA during compaction
复制标题
DOI：
10.1080/10298436.2019.1659264
复制
发表时间：
2019-08
影响因子：
3.8
通讯作者：
Huanan Yu;Changyun Shi;G. Qian;Xiangbing Gong
中科院分区：
文献类型：
--
作者：
Huanan Yu;Changyun Shi;G. Qian;Xiangbing Gong
摘要热参数是评价沥青路面温度场和温度应力的关键参数。然而，由于传统测试方法的限制，不同研究者所测得的沥青及沥青混合料的热学参数差异很大。因此，介绍一种简便、规范的沥青混合料热学参数测试方法显得尤为重要。提出了一种新的测试方法，以精确测定沥青混合料在压实温度下的热参数，并研究了不同空隙率对沥青混合料热扩散率及参数的影响。采用差示扫描量热法（DSC）测定了沥青及沥青混合料的热流曲线，得到了混合料的计算比热值和实测比热值。然后根据热物性参数之间的换算关系计算出相应的导热系数。结果表明，由比热计算值换算得到的导热系数与前人研究结果接近，但可以准确、方便地获得压制过程中温度场的热学参数。该研究为沥青及沥青混合料的热性能评价提供了一种新的方法。
ABSTRACT The thermal parameters are key parameters for evaluating the temperature field and temperature stress of asphalt pavement. However, due to the restriction of tradition test method, the thermal parameters of asphalt and asphalt mixtures measured by various researchers are quite different. Therefore, it is particularly important to introduce a simple and standard test method for thermal parameters of asphalt mixtures. This research proposed a novel test method to precisely determine the thermal parameters of asphalt mixture during compaction temperature, the effects of different air voids on the thermal diffusivity and parameters were evaluated. Differential scanning calorimetry (DSC) was used to measure the heat flow curves of asphalt and asphalt mixture, and the calculated and measured specific heat values of the mixture were obtained. Then the corresponding thermal conductivity was calculated from the conversion relationship between thermal parameters. The results indicated that the thermal conductivity converted from the calculated value of specific heat is close to previous studies, but the thermal parameters of the temperature field during the compaction process can be obtained accurately and conveniently. This research provides a new method for the thermal properties evaluation of asphalt and asphalt mixture .