Performance evaluation of high-elasticity asphalt mixture containing inorganic nano-titanium dioxide for applications in high altitude regions
Performance evaluation of high-elasticity asphalt mixture containing inorganic nano-titanium dioxide for applications in high altitude regions
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高海拔地区含无机纳米二氧化钛高弹性沥青混合料性能评价
DOI：
10.1016/j.conbuildmat.2018.12.053
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发表时间：
2019-02
影响因子：
7.4
通讯作者：
Wang Lin bing
中科院分区：
文献类型：
--
作者：
Zheng Dong;Qian Zhen dong;Li Pan;Wang Lin bing
为了抵抗高海拔地区强烈的太阳紫外线（UV）辐射和大的温度/湿度波动，提出了一种含有无机纳米二氧化钛（Nano-TiO2）的高弹性沥青（HEA）混合物。本文介绍了纳米 TiO2 改性 HEA 沥青 (MHEA) 和 MHEA 混合物性能的实验室研究。首先使用动态剪切流变仪、弯梁流变仪和紫外老化炉对沥青结合料的流变性能和抗紫外老化性能进行了评估。此外，在实验室还评估了混合物的性能，包括抗车辙性、低温抗裂性、水分稳定性、抗紫外线老化性和抗反复冻融循环性。结果表明，纳米TiO2的添加可以提高HEA沥青的高温流变性和抗紫外老化性能，而对低温流变性没有明显影响。此外，使用MHEA沥青时，其抗车辙性能和低温抗裂性能可提高至苯乙烯-丁二烯-苯乙烯（SBS）混合物的约两倍。在耐反复冻融循环方面，MHEA混合物比SBS混合物表现更好，体现在相同冻融循环下，空隙结构损伤更小，拉伸强度比更高，冻融损伤率更低。研究结果表明，MHEA混合料在高海拔地区沥青路面中具有巨大的应用潜力。
To resist the strong solar ultraviolet (UV) radiation and large temperature/moisture fluctuation in high altitude regions, a high-elasticity asphalt (HEA) mixture containing inorganic Nano-titanium dioxide (Nano-TiO2) is proposed. This paper presents a laboratory study on the performance of Nano-TiO2modified HEA asphalt (MHEA) and MHEA mixtures. Rheological properties and UV-aging resistance of asphalt binder were first assessed using dynamic shear rheometer, bending beam rheometer and UV weathering oven. Furthermore, mixture properties, including rutting resistance, low-temperature cracking resistance, moisture stability, UV-aging resistance and recurrent freeze-thaw cycle resistance, were evaluated in the laboratory. Results show that addition of Nano-TiO2can improve the high-temperature rheology and UV-aging resistance of HEA asphalt, with no obvious influence on low-temperature rheology. In addition, When MHEA asphalt is used, the rutting resistance and low-temperature cracking resistance can be improved approximately to twice that of styrene–butadiene–styrene (SBS) mixture. In term of recurrent freeze-thaw cycle resistance, MHEA mixture performs better than SBS mixture, as reflected in smaller void structure damage, higher tensile strength ratio and lower freeze-thaw damage ratio at the same freeze-thaw cycles. The findings indicate that MHEA mixture has a great potential to be applied in asphalt pavement in high altitude regions.
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