水泥路面加铺超薄罩面层间黏结性能

Bonding Performance of Super-thin Overlay on Cement Pavement

针对水泥路面上加铺沥青超薄罩面的层间黏结性能进行拉拔和剪切试验,分析了黏结剂用量、基面处治、原材料对黏结强度的影响.设置了冻融循环、60℃浸水养生、车辙碾压三种条件,研究了沥青超薄罩面层间黏结耐久性的影响因素.结果表明:不同黏结材料的最佳用量有明显差异,最佳掺量条件下溶剂型黏结剂的黏结强度优于其他材料.水泥混凝土表面进行喷砂、拉毛,以及露石能够提高沥青-水泥组合试件的层间黏结强度,喷砂对黏结强度的改善效果最好.不同黏结剂的黏结强度排序为溶剂型黏结剂>SBS沥青碎石封层>改性乳化沥青稀浆封层>改性乳化沥青.养生破坏条件对残留剪切强度比的影响存在差异,60℃浸水养生后改性乳化沥青的残留剪切强度比大于溶剂型黏结剂,冻融循环和车辙加载后溶剂型黏结剂的残留剪切强度仍然达到1 MPa以上.

Pull-out and shear tests were carried out on the interlayer bonding performance of asphalt overlay on cement pavement,and the effects of binder dosage,base treatment and raw materials on bonding strength were analyzed.Three conditions,freeze-thaw cycle,soaking at 60℃and rutting rolling,were set up,and the influencing factors of bonding durability between asphalt ultra-thin overlay were studied.The results show that the optimal dosage of different bonding materials is obviously different,and the bonding strength of solvent-based adhesive is better than other materials under the optimal dosage.Sand blasting,roughening and stone exposure on the surface of cement concrete can improve the interlayer bond strength of asphalt-cement composite specimens,and sand blasting has the best effect on improving the bond strength.The order of bond strength of different binders is solvent binder>SBS asphalt macadam seal coat>modified emulsified asphalt slurry seal coat>modified emulsified asphalt.The influence of curing failure conditions on the residual shear strength ratio is different.The residual shear strength ratio of modified emulsified asphalt after curing at 60℃is greater than that of solvent-based binder,and the residual shear strength of solvent-based binder still reaches more than 1MPa after freeze-thaw cycle and rutting loading.