Wang Yanzhu, Wang Xudong, Ma Zhimin, Shan Lingyan, Zhang Chao
School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China.
Research Institute of Highway, Ministry of Transport, Beijing 100088, China.
Materials (Basel). 2022 May 6;15(9):3341. doi: 10.3390/ma15093341.
Asphalt mortar is a typical temperature-sensitive material that plays a crucial role in the performance of asphalt mixture. This study evaluates the high- and low-temperature performance of asphalt mortar based on the dynamic mechanical analysis (DMA) method. Temperature-sweep tests of asphalt mortars were conducted using the DMA method under fixed strain level, frequency, and heating rate conditions. The dynamic mechanical response curves, characteristic temperature, and other indices were obtained and used to investigate the high- and low-temperature performance of asphalt mortar. The results showed that the phase transition temperatures T, T, and T can be used to evaluate the low-temperature performance of asphalt mortar. Additionally, they had a good linear relationship, and the evaluation results were consistent. Meanwhile, T, E, and tan(δ) indicators can effectively evaluate the high-temperature performance of asphalt mortar. Asphalt plays a key role in the performance of asphalt mortar. Mortars with neat asphalt A70 and modified asphalt AR had the worst and best high- and low-temperature performances, respectively. Furthermore, the finer gradation improved the low-temperature performance of asphalt mortar, while the coarser gradation improved the high-temperature properties of modified asphalt mortars but had the opposite effect on neat asphalt A70.
沥青胶浆是一种典型的温度敏感材料，在沥青混合料性能中起着关键作用。本研究基于动态力学分析（DMA）方法评估沥青胶浆的高温和低温性能。在固定应变水平、频率和升温速率条件下，采用DMA方法对沥青胶浆进行温度扫描试验。获得了动态力学响应曲线、特征温度等指标，并用于研究沥青胶浆的高温和低温性能。结果表明，相转变温度T、T和T可用于评估沥青胶浆的低温性能。此外，它们具有良好的线性关系，评估结果一致。同时，T、E和tan(δ)指标可有效评估沥青胶浆的高温性能。沥青在沥青胶浆性能中起关键作用。纯沥青A70和改性沥青AR的胶浆分别具有最差和最好的高温和低温性能。此外，较细的级配改善了沥青胶浆的低温性能，而较粗的级配改善了改性沥青胶浆的高温性能，但对纯沥青A70有相反的影响。
