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路面施工作业中,沥青混合料搅拌站供给自卸卡车的混合料是符合质量要求的,既不存在级配的离析,也没有温度的离析。然而,原来经充分搅拌、温度均匀的沥青混合料,经过某一过程后,温度出现较大差异,导致在沥青路面施工中产生了普遍存在的沥青混合料的温度离析问题。发达国家对沥青混合料的温度离析已作了大量的研究。美国Astec公司使用高精度红外线摄像机对摊铺作业进行拍摄,发现温度离析程度要比人们所预想的大得多。例如,143℃的沥青混合料装入自卸卡车,运输距离仅为20km左右,抵达摊铺现场时,
Pavement construction operations, asphalt mixing plant supply dump truck mix is in line with the quality requirements, there is no graded separation, there is no temperature segregation. However, the original fully mixed, uniform temperature asphalt mixture, after a certain process, the temperature difference is large, resulting in the asphalt pavement construction ubiquitous asphalt mixture temperature segregation problems. Developed countries have done a lot of research on temperature segregation of asphalt mixture. Astec, Inc. of the United States used high-precision infrared cameras to take pictures of paving jobs and found that the degree of temperature segregation was much greater than previously thought. For example, 143 ℃ asphalt mixture into the dump truck, transport distance is only about 20km, arrived at the paving site,