温拌再生沥青混合料耐久性能

发布时间：2018-07-22 16:41

【摘要】：为了使温拌再生沥青混合料(WRAM)在路面中更好地得以应用,采用老化试验、冻融循环劈裂试验和疲劳试验研究添加2种化学温拌剂的WRAM及热再生沥青混合料(HRAM)的耐久性能,并在老化试验中分别考虑短期及长期老化2种工况,评价老化后混合料的水稳定性能和低温抗裂性能。研究结果表明:短期老化后WRAM的抗拉强度比(TSR)较未老化时增加,而长期老化后WRAM的TSR值显著降低;与未老化WRAM相比,短期及长期老化后WRAM的最大弯曲拉应变均降低;随着冻融循环次数的增加,WRAM的TSR值总体呈下降趋势,但经受冻融循环3次后WRAM的TSR值急剧提高,冻融循环5次后WRAM的TSR值迅速降低;WRAM和HRAM的疲劳寿命对应力比变化的敏感性相近;添加2种温拌剂的WRAM耐久性能存在差异,但均优于HRAM。
[Abstract]:In order to improve the application of warm mix recycled asphalt mixture (WRAM) in pavement, aging test, freeze-thaw cycle splitting test and fatigue test were used to study the durability of WRAM and hot recycled asphalt mixture (HRAM). The water stability and low temperature crack resistance of the aged mixture were evaluated by considering the short and long term aging conditions in the aging test. The results showed that the tensile strength ratio (TSR) of WRAM after short term aging was higher than that of unaged WRAM, but the TSR value of WRAM decreased significantly after long term aging, and the maximum bending tensile strain of WRAM decreased after short and long term aging compared with that of unaged WRAM. The TSR value of WRAM decreased with the increase of freeze-thaw cycle times, but the TSR value of WRAM increased sharply after three freeze-thaw cycles. After five cycles of freeze-thaw cycle, the TSR value of WRAM rapidly reduced the fatigue life of WRAM and HRAM, and the durability of WRAM with two kinds of warm mixing agents was different, but both of them were better than HRAM.
【作者单位】：大连海事大学道路与桥梁工程研究所;密歇根理工大学土木与环境工程系;哈尔滨工业大学交通科学与工程学院;
【基金】：国家自然科学基金项目(51308084) 辽宁公路科研项目(201201) 中央高校基本科研业务费专项资金项目(3132014223)
【分类号】：U414

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