多孔隙聚氨酯碎石混合料强度及路用性能

发布时间：2018-11-19 13:23

【摘要】：为了给多孔隙聚氨酯碎石透水路面设计与施工提供参考,针对多孔隙聚氨酯碎石混合料(PPM)强度特性和路用性能开展试验研究。首先采用立方体无侧限抗压试验和矩形梁抗折试验对PPM的强度和模量进行了测试,研究成型方法、养护时间、胶水用量、碎石形状、孔隙率等因素对其强度的影响,通过全过程荷载-应力试验对PPM强度特性及破坏机理进行研究;然后针对PPM的抗变形性能、水稳定性能、抗滑性能、抗疲劳性能、抗腐蚀性能以及耐老化性能等路用性能展开试验。结果表明:胶水用量质量分数在4%~6%时,PPM抗压强度介于6~10 MPa,抗折强度介于4~6MPa,胶水用量和碎石形状对PPM强度影响显著,成型方法和养护时间、温度对其最终强度几乎没有影响;PPM具有较好的抗变形能力、抗滑性能、抗疲劳性能、抗腐蚀性能及耐光热老化性能,但其水稳定性一般,5次冻融循环后抗压强度损失率约为15%。
[Abstract]:In order to provide reference for the design and construction of porous polyurethane macadam permeable pavement, the (PPM) strength characteristics and road performance of porous polyurethane macadam mixture are studied experimentally. The strength and modulus of PPM were tested by cube unconfined compression test and rectangular beam flexural test. The influence of molding method, curing time, glue dosage, gravel shape, porosity and other factors on the strength of PPM were studied. The strength characteristics and failure mechanism of PPM were studied by load-stress test. Then the tests were carried out on the deformation resistance, water stability, slide resistance, fatigue resistance, corrosion resistance and aging resistance of PPM. The results show that when the mass fraction of glue is 4 ~ 6, the compressive strength of PPM is between 6 ~ 10 MPa, and the flexural strength of PPM is 4 ~ 6 MPA. The content of glue and the shape of crushed stone have significant effects on the strength of PPM, the forming method and curing time. Temperature has little effect on the final strength. PPM has good deformation resistance, slip resistance, fatigue resistance, corrosion resistance and photothermal aging resistance, but its water stability is general, and the loss rate of compressive strength after five freeze-thaw cycles is about 15%.
【作者单位】：招商局重庆交通科研设计院有限公司;重庆交通大学土木建筑学院;重庆市水利电力建筑勘测设计研究院;
【基金】：国家自然科学基金项目(51178491)
【分类号】：U414

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