石墨-碳纤维复合导电沥青混凝土力学性能研究

Mechanical Properties of Graphite-Carbon Fiber Composite Conductive Asphalt Concrete

针对传统导电沥青混凝土路用性能不佳的问题,采用石墨与碳纤维制备了复合导电沥青混凝土,并通过动态蠕变试验、Overlay Tester试验及马歇尔试验对比分析了普通沥青混凝土、石墨导电混凝土以及复合导电混凝土的力学性能,结果表明:在相同加载条件下,石墨-碳纤维复合导电混凝土的蠕变累积应变比最小,在动态稳定阶段的蠕变速率最低,且在加载次数内未进入破坏阶段,复合导电混凝土具有优良的高温稳定性。石墨-碳纤维复合导电混凝土的抗裂循环次数和总断裂能均大于石墨导电混凝土和普通沥青混凝土,复合导电混凝土抗裂性能最优,可以有效延缓反射裂缝扩张。石墨对于沥青混凝土的水稳定性具有不利影响,而石墨-碳纤维复合导电混凝土与普通沥青混凝土的残留稳定度比及冻融劈裂强度比相当,能够满足行业规范的技术要求。

To solve the problem of poor road performance of traditional conductive asphalt concrete,composite conductive asphalt concrete was prepared by using graphite and carbon fiber,and the mechanical properties of ordinary asphalt concrete,graphite conductive concrete,and composite conductive concrete were compared and studied through dynamic creep test,Overlay Tester test,and immersion Marshall test.The results showed that under the same load condition,the graphite-carbon fiber composite conductive concrete had the lowest cumulative creep strain ratio and the creep rate in the dynamic stable stage,and did not enter the failure stage within the loading times,indicating that it had excellent high-temperature stability.The number of anti-cracking cycles and total fracture energy of the graphite-carbon fiber composite conductive concrete were higher than those of graphite conductive concrete and ordinary asphalt concrete,meaning the composite conductive concrete had the optimal anti-cracking performance and could effectively delay the expansion of reflection cracks.The graphite hurt the water stability of the asphalt concrete,while the residual stability ratio and freeze-thaw splitting strength ratio of graphite-carbon fiber composite conductive concrete were similar to those of ordinary asphalt concrete,which could meet the technical requirements of the industry specification.