半刚性基层沥青路面低温抗裂性研究

【作者】 武贤慧；

【导师】 张登良；

【作者基本信息】 长安大学 ， 道路与铁道工程， 2003， 硕士

【摘要】 半刚性基层沥青路面以其优越的路用性能成为我国高速公路路面结构的主要形式，但路面的低温开裂一直是影响其使用品质的重大问题。本文针对内蒙地区寒冷的气候特点，通过水泥稳定砂砾材料特性研究，确定了合适的水泥剂量，以减轻基层产生温缩裂缝。采用不同的低温试验方法验证掺加GoodRoadⅡ聚酯纤维以及采用SBS改性沥青后对混合料低温性能的改善程度，并对其机理做了探讨。通过反射裂缝足尺试验来评价GoodRoadⅡ增强沥青混合料和玻璃纤维土工格栅对抑制反射裂缝的效果，对抑制机理做了分析。试验证明，在普通沥青混合料中加入聚酯纤维以及使用改性沥青可脆化点温度降低，增强低温抗裂性，加入GoodRoadⅡ聚酯纤维和在基层与面层之间铺设玻纤格栅可有效抑制反射裂缝，值得推广。更多还原

【Abstract】 Asphalt pavement on semi-rigid road base has become the main form of pavement structure for highways, while the low temperature cracking has been the important problem influencing the pavement quality. To the chill climate character on NeiMeng region, this paper selects the suitable cement content for decreasing temperature contraction cracking on road base through the test of cement stabilized sand-gravel material. By means of various low temperature test methods, the influence degree on the low temperature performance of GoodRoad Ⅱ fiber enhanced asphalt mixture and SBS modified asphalt mixture are tested, and the strengthening mechanism is analyzed. The effects of GoodRoad Ⅱ enhanced asphalt mixture and glass fiber grid for resisting reflection cracking are proved by full-scale test, the resisting mechanism is analyzed ,too. It proves that adding up fiber and modified asphalt in the common asphalt mixture can decrease the brittle point temperature and strength the ability of resisting cracking. Fiber-reinforced asphalt concrete and glass fiber grid which has been set between the road base and overlay can delaying reflection cracking effectively.更多还原