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沥青材料在沥青混合料的拌和、摊铺、碾压过程中都存在热老化问题,本文采用烘箱加热法对2种集料、2种沥青的混合料的热老化的高温、低温和疲劳性能进行了研究,试验表明,热老化可以提高沥青混合料的高温性能,但在热老化到一定程度后,很难压密,变形很小;随热老化温度的升高或老化时间增加,沥青混合料抗弯拉强度和弯拉应变均减小,但是采用改性沥青,或者优质的集料均可改善其老化后的低温性能;未老化的沥青混合料的疲劳寿命对应力变化很敏感,而老化24h后的沥青混合料的疲劳寿命对应力变化的敏感性变差。
Asphalt material has the problem of heat aging during the mixing, paving and rolling process of asphalt mixture. In this paper, the heat aging high temperature, low temperature and fatigue properties of 2 kinds of aggregate and 2 kinds of asphalt mixture are carried out by oven heating method The study shows that heat aging can improve the high temperature performance of asphalt mixture, but after heat aging to a certain extent, it is difficult to compact and deformation is very small. With the increase of heat aging temperature or aging time, asphalt mixture The flexural strength and bending strain of the uniaxial asphalt mixture are both reduced, but the modified asphalt or high-quality aggregates can improve the low-temperature properties after aging. The fatigue life of the unaged asphalt mixture is sensitive to the change of stress, The fatigue life of asphalt mixtures after 24h is less sensitive to the change of stress.