粘层乳化沥青层间抗剪性能及其评价方法研究

Study on interlayer shear performance and evaluation method of emulsified asphalt

为解决路面养护工程中超薄罩面层与原始路面间易出现剪切破坏的问题,选取三种乳化沥青通过斜剪试验模拟路面在车辆荷载下的剪切破坏。结果表明,温度升高会导致乳化沥青层间抗剪强度下降;面层混合料集料粒径增大与沥青量增多会导致层间抗剪强度增加;不同乳化沥青自身性质差异会导致层间抗剪强度不同,较SBS乳化沥青与普通乳化沥青,橡胶乳化沥青粘结性能最好。对比完整车辙板与复合车辙板的抗剪强度,复合路面抗剪强度较完整路面会发生不同程度的下降,其中无粘层油的空白复合车辙板下降程度最大,抗剪强度仅有完整路面的64.37%。通过洒布粘层乳化沥青可以使层间抗剪强度提高,其中橡胶乳化沥青可达到完整路面抗剪强度的75.85%。

In order to solve the problem of shear failure between the ultra-thin overlay layer and the original pavement in road maintenance engineering,three types of emulsified asphalt are selected to simulate the shear failure of the pavement under vehicle load through oblique shear tests.The results show that an increase in temperature can lead to a decrease in the interlayer shear strength of emulsified asphalt.The increase in aggregate particle size and asphalt content of the surface layer mixture can lead to an increase in interlayer shear strength.The differences in the properties of different emulsified asphalt can lead to different interlayer shear strengths.Compared with SBS emulsified asphalt and ordinary emulsified asphalt,rubber emulsified asphalt has the best bonding performance.Comparing the shear strength of intact rutting boards and composite rutting boards,it shows that the shear strength of composite pavement will decrease to varying degrees compared to intact pavement.Among them,the blank composite rutting board without adhesive layer oil has the greatest degree of reduction,with a shear strength of only 64.37%of intact road surface.Spraying adhesive layer emulsified asphalt can improve the interlayer shear strength,among which rubber emulsified asphalt can reach 75.85%of the intact road surface shear strength.