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开发了一种适用于道路工程的新型环氧沥青,基于拉伸试验、黏度试验和荧光显微技术评价了其抗拉强度、断裂伸长率、黏度随时间增长规律和微观固化机理;设计了AC-13C环氧沥青混凝土,评价了其路用性能和疲劳特性,分析了普通沥青混凝土、SBS改性沥青混凝土与环氧沥青混凝土作为抗疲劳层材料对柔性基层长寿命沥青混凝土路面结构厚度与疲劳寿命的影响。试验结果表明:开发的环氧沥青抗拉强度为2.47 MPa,断裂伸长率为2.65,满足环氧沥青抗拉强度不小于1.5MPa、断裂伸长率不小于2的技术要求;环氧沥青黏度增长到1Pa·s的时间为54min,54min后,黏度迅速增大,因此,施工时环氧沥青混凝土的拌和、运输与摊铺总时间应控制在54min内;根据环氧沥青混凝土疲劳方程反推出当其疲劳寿命为10亿次时的疲劳应变极限为333με;相对于普通沥青混凝土和SBS改性沥青混凝土,环氧沥青混凝土抗疲劳层路面结构的疲劳寿命分别增大了2.92×10~5、4.39×10~3倍,沥青层厚度分别减小了18、10cm;环氧沥青的微观固化机理为环氧树脂与固化剂在沥青中逐渐从点到线、由线到网形成交联的三维网状结构。
A new type of epoxy asphalt suitable for road engineering was developed. The tensile strength, elongation at break, viscosity increase with time and microscopic curing mechanism were evaluated based on tensile test, viscosity test and fluorescence microscopy. AC-13C epoxy asphalt concrete, evaluation of road performance and fatigue characteristics of ordinary asphalt concrete, SBS modified asphalt concrete and epoxy asphalt concrete as anti-fatigue layer material on the flexible base long-life asphalt concrete pavement structure thickness and Effect of fatigue life. The test results show that the developed epoxy asphalt has a tensile strength of 2.47 MPa and an elongation at break of 2.65, which meets the technical requirements of epoxy asphalt tensile strength of not less than 1.5MPa and elongation at break of not less than 2. Epoxy asphalt viscosity The time of increasing to 1Pa · s is 54min. After 54min, the viscosity increases rapidly. Therefore, the total mixing, transportation and paving time of epoxy asphalt concrete during construction should be controlled within 54min. According to the fatigue equation of epoxy asphalt concrete When the fatigue life of one billion times the fatigue strain limit of 333με; Compared to ordinary asphalt concrete and SBS modified asphalt concrete, the fatigue life of epoxy asphalt concrete anti-fatigue layer pavement structure increased by 2.92 × 10 ~ 5, 4.39 × 10 ~ 3 times, respectively, the thickness of the asphalt layer is reduced by 18,10cm; Epoxy asphalt microscopic curing mechanism for the epoxy resin and curing agent in asphalt gradually from point to line, from the line to the network to form a cross-linked three-dimensional grid.