国产环氧沥青钢桥面铺装材料配合比设计及疲劳特性研究
发布时间：2018-08-03 18:44
【摘要】：环氧沥青混凝土以其优越的力学性能和路用性能已成为大跨径正交异性钢桥面沥青面层铺装的主要材料。正交异性钢桥面的力学响应具有强烈的局部特征,在车辆荷载作用下钢桥面铺装结构层易形成局部应力集中,加劲肋顶部铺装层出现超大弯矩,局部弯曲变形较大,进而导致沥青铺装层产生疲劳开裂。通过国产环氧沥青的制备及性能试验,表明在120℃条件下,当固化时间为16h时,国产环氧沥青已经完全固化;制备的国产环氧沥青具有良好的拉伸性能;不同试验温度,制备的国产环氧沥青粘度随时间的变化规律相同,约50min内,粘度不随时间变化,随后随时间迅速变大。利用I法和填充试验方法进行国产环氧沥青混合料配合比设计,综合考虑马歇尔试件的稳定度、毛体积密度和空隙率指标,确定出两种级配国产环氧沥青混合料的最佳油石比分别为6.35%和6.55%。研究结果表明,I级配国产环氧沥青混合料的高温抗车辙能力和表面抗滑性能明显优于采用平胜级配所制备的环氧沥青混合料,而水稳定性和低温抗裂性与采用平胜级配所制备的环氧沥青混合料相当。疲劳试验结果表明,当重复荷载为5KN时,常温疲劳试验、高温疲劳试验、低温疲劳试验,两种级配制备的国产环氧沥青混合料复合梁试件经受2100万加载循环次数仍未出现破坏;当重复荷载为8KN或10KN时,I级配制备的国产环氧沥青混合料的疲劳寿命分别是平胜级配制备的国产环氧沥青混合料疲劳寿命的1.47倍和3.49倍。
[Abstract]:Epoxy asphalt concrete has become the main material for asphalt pavement of long span orthotropic steel deck due to its superior mechanical properties and road performance. The mechanical response of orthotropic steel deck has strong local characteristics. Under the action of vehicle load, local stress concentration is easily formed in the steel deck pavement layer, and the oversized bending moment appears at the top of stiffened rib, and the local bending deformation is larger. This will lead to fatigue cracking of asphalt pavement. Through the preparation and performance test of domestic epoxy asphalt, it is shown that at 120 鈩，
本文编号：2162666
[Abstract]:Epoxy asphalt concrete has become the main material for asphalt pavement of long span orthotropic steel deck due to its superior mechanical properties and road performance. The mechanical response of orthotropic steel deck has strong local characteristics. Under the action of vehicle load, local stress concentration is easily formed in the steel deck pavement layer, and the oversized bending moment appears at the top of stiffened rib, and the local bending deformation is larger. This will lead to fatigue cracking of asphalt pavement. Through the preparation and performance test of domestic epoxy asphalt, it is shown that at 120 鈩，
本文编号：2162666
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