摘要
为解决现有水泥混凝土和沥青混凝土路面材料在拉萨地区推广应用中受冻融作用破坏的问题,对不同空隙率的半柔性路面材料在拉萨的应用进行研究。采用灌注式的方式将水泥胶浆灌入不同空隙率的开级配沥青混合料母体中制成试件,并根据拉萨独特的气候特征设定冻融试验的时间和温度;再进行高温稳定试验和低温抗裂试验,得出趋近于真实冻融环境的试验数据。分析试验数据可得,半柔性路面材料在受到冻融作用破坏时,低温抗裂强度随着空隙率的增大呈逐渐上升趋势,劈裂位移量随着空隙率的增大呈逐渐减小趋势;而表征高温稳定性能的动稳定度随着空隙率的增大呈先上升后下降的趋势,变形速率随着空隙率的增大呈先下降后上升的趋势。研究结果表明,半柔性路面材料采用27%的空隙率并添加塑弹性材料有利于抵抗冻融破坏,从而能够在高原地区推广和应用。
In order to solve the problem that the cement concrete and asphalt concrete pavement materi-al were damaged by freezing-thawing action during their popularization and application in Lhasa, a re-search about the application of semi-flexible pavement materials with different void fraction in Lhasawas carried out. Test specimens were made by the way of pouring cement mortar into open-graded as-phalt mixture matrix with different void fraction. The time and temperature of freezing-thawing test wereset based on the special environment of Lhasa. Then the high-temperature stability test and low-temper-ature crack resistance test were carried out to obtain the test data closing to the real environment. By ana-lyzing the test data, it was educed that： when semi-flexible pavement material was destroyed by freezingthawing action, with the increasing of void fraction, the low-temperature crack resistance increased grad-ually, and the split displacement decreased gradually; meanwhile, the dynamic stability characterizinghigh temperature stability presented a trend that it increased first and then decreased with the increasingof void fraction, and the rate of deformation presented a trend that it decreased first and then increased.The results show that the semi-flexible pavement material with 27% void fraction and addition of elasticplastic material is beneficial for resisting the freezing-thawing damage, after that it can be generalizedand applied in plateau region.
出处
《交通运输研究》
2016年第3期63-68,共6页
Transport Research
基金
西藏自治区大学生创新性实验训练计划项目(2014QCX033)
四川省教育厅项目(16ZB0164)
四川省道路工程省重点实验室开放研究基金资助项目(15206569)
关键词
半柔性路面材料
空隙率
冻融试验
拉萨
高原
semi-flexible pavement material
void fraction
freezing-thawing text
Lhasa
plateau
