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该文对美国南卡罗莱纳州两条(开级配沥青混合料)OGFC试验路进行了针对性研究与总结,以确定不掺加纤维是否会对OGFC混合料的性能产生影响。其中一条试验路包含3种OGFC混合料:掺加木质素纤维的热拌沥青混合料(HMA)、未掺纤维而采用废轮胎橡胶粉改性的沥青混合料(GTR),未掺纤维的温拌沥青混合料(WMA);另一条试验路包含两种:HMA、WMA。试验结果表明:(1)不掺加纤维对混合料的析漏损失、渗水率、抗磨耗性、间接拉伸强度和抗疲劳强度并未产生不利影响;(2)虽然没有掺加木质素纤维,采用温拌技术生产的温拌沥青混合料的抗疲劳强度仍然高于HMA混合料;(3)温拌沥青混合料可能会减少摊铺初始阶段(可流动的沥青混合料首先通过冷的材料传送装置,然后到达冷的摊铺装置)的热量损失,而较低的热量损失能够改善摊铺初始位置横向冷接缝附近OGFC面层的密度稳定性,从而可能改善路面性能。
In this paper, two (open graded asphalt mixtures) OGFC pilot roads in South Carolina, USA, were studied and summarized to determine whether the incorporation of fibers would affect the performance of the OGFC mixture. One of the test runs consisted of three OGFC mixes: hot mix asphalt (HMA) with lignin fibers, unadulterated fiber with waste tire rubber powder modified asphalt mixture (GTR), unadulterated fiber temperature Mix asphalt mixture (WMA); another test road contains two kinds: HMA, WMA. The results showed that: (1) no loss of leakage rate, water permeability, abrasion resistance, indirect tensile strength and fatigue strength of the mixture were not adversely affected; (2) Although no lignin fibers , The fatigue resistance of warm mix asphalt produced by warm mix is still higher than that of HMA mix; (3) Warm mix asphalt may reduce the initial stage of paving (flowable asphalt first passes through cold material Conveyor and then to cold paver), while lower heat loss can improve the density stability of the OGFC facing near the transverse cold seams in the initial paving location, potentially improving pavement performance.