论文部分内容阅读
为了研究温拌沥青混合料的压实性能及其可压实的难易程度,选用3种同品牌温拌沥青(ACMP1、ACMP2与ACMP3)和2种热拌沥青(70#基质沥青与SBS改性沥青),制备了AC-13C型沥青混合料,采用马歇尔击实试验,变化不同的击实次数和击实温度,测试了马歇尔试件的压实度和稳定度,分析了其变化规律,建立了压实度与击实次数的指数回归关系,引入了压实成长曲率因子,定义了压实难易系数。试验结果表明:沥青混合料的压实度随着击实次数的增加而呈指数增长,初期增长较快,后期较慢,且最终趋于稳定;在击实温度为90℃~150℃的范围内,压实度随着击实温度的升高呈线性增长;马歇尔稳定度随压实度增大呈线性增长变化,符合传统研究结果;温拌沥青混合料的压实难易系数比热拌沥青混合料降低了13.5%~18.5%,具有较小的压实难易系数,更容易压实。
In order to study the compaction properties and compaction ease of warm mix asphalt, three kinds of hot mix asphalt (ACMP1, ACMP2 and ACMP3) and two hot mix asphalt (70 # Asphalt, the AC-13C asphalt mixture was prepared. The compaction and stability of the Marshall specimen were tested by Marsh compaction test and different compaction times and compaction temperatures. The variation rules were analyzed. An exponential regression relationship between compaction degree and compaction times was established. Compaction growth curvature factor was introduced and compaction difficulty coefficient was defined. The results show that the compaction degree of asphalt mixture increases exponentially with the increase of compaction times, the initial increase is rapid, the later is slow, and finally tends to be stable. When compaction temperature is in the range of 90 ℃ ~ 150 ℃ The compaction degree increases linearly with the increase of compaction temperature. The Marshall stability increases linearly with the increase of compaction degree, which accords with the traditional research results. The compaction difficulty coefficient of warm mix asphalt is higher than that of hot mix Asphalt blends have been reduced by 13.5% to 18.5% with less compaction effort and easier compaction.