压实温度对温拌NovaChip沥青混合料路用性能的影响

    Influence of Compaction Temperature on Pavement Performance of NovaChip Warm Mix Asphalt

    • 摘要: 在添加温拌剂 (EvothermTM和Sasobit) 的条件下, 分别在压实温度为135、145、155、165℃时成型不同类型的混合料试件, 并进行相关试验, 以确定压实温度对NovaChip Type C型沥青混合料路用性能的影响并得出其合理的压实温度范围.试验数据分析显示:压实温度对NovaChip Type C的高温稳定性影响较为明显, 随着压实温度从135℃提高到165℃时, 混合料的高温稳定性呈现出先增大后减小的趋势, 马歇尔稳定度在155℃时达到最大值, 动稳定度在145℃时达到最大值;压实温度对NovaChip Type C的水稳定性影响不明显, 随着压实温度的提高, 混合料的水稳定性呈现出先增大后减少的趋势, 但变化的幅度不大;NovaChip Type C的低温抗裂性随着压实温度的提高呈现出先减少后增大的趋势, -10℃的破坏弯拉应变在165℃时达到最大值;NovaChip Type C的合理压实温度范围为135~145℃.

       

      Abstract: Under the condition of adding warm mixing agents (i. e. EvothermTM and Sasobit) , four kinds of specimens were formed respectively at temperatures of 135, 145, 155 and 165 ℃. These specimens were used to conduct test in order to determine compaction temperature's impact on the pavement performance of NovaChip Type C and to find out a reasonable range of compaction temperature.By analyzing of the test data, four main conclusions are made as follows. Firstly, compaction temperature has a significant influence on the high-temperature stability of NovaChip Type C. As the compaction temperature increases from 135 ℃ to 165 ℃, the high-temperature stability of the mixtures increases firstly and then begins to decrease after the peaks. Marshall Stability reaches the maximum at 155 ℃, and Dynamic Stability reaches the maximum at 145 ℃. Secondly, compaction temperature has no obvious influence on the moisture sensitivity of NovaChip Type C. As compaction temperature increases, the moisture sensitivity of the mixtures also increases firstly and then begins to decrease after the peaks.However, in general, its range only changes a little bit. Thirdly, as the compaction temperature increases, the low-temperature cracking resistance of NovaChip Type C decreases firstly and then begins to increase after the peaks, and its flexural-tensile failure strain of- 10 ℃ reaches a maximum at 165℃. Fourth, the reasonable compaction temperature range of NovaChip Type C is 135 ~ 145 ℃.

       

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