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为实现超刚柔并济的半柔性路面的设计与应用,对乳胶水泥砂浆的性能与乳胶水泥砂浆灌入复合式试件进行全面试验评价。首先选用等级42.5的硅酸盐水泥,采用流动度、抗折强度与抗压强度试验,对乳胶水泥砂浆的配比进行了试验研究,确定乳胶水泥砂浆质量配比为m(水)∶m(水泥)∶m(细砂)∶m(矿粉)∶m(乳胶粉)=720∶1 000∶497∶249∶30。同时选用SBS改性沥青与相应级配的石灰岩集料,以肯特堡飞散、马歇尔试验对大孔隙沥青混合料的配比组成进行了研究,得出了乳胶水泥砂浆和沥青混合料的最佳配合比;而后采用马歇尔试验、车辙试验、低温弯曲试验、冻融劈裂性能、渗透性试验和摆式摩擦系数试验,对未灌浆的大孔隙沥青混合料、灌浆养生7 d和28 d的乳胶水泥砂浆灌入式沥青混合料的性能进行试验评价。试验结果显示,乳胶水泥砂浆的灌入可以有效提升沥青混合料的强度、高温抗车辙、水稳定性、摩擦性能,并且随着养生时间的增长,灌入式试件的强度会提升。同时,乳胶改性剂的添加能够较好地改善水泥砂浆的灌入对混合料低温变形能力的影响。
In order to realize the design and application of semi-flexible pavement with super rigidity and softness, the performance of latex cement mortar and latex cement mortar pouring compound specimen were comprehensively evaluated. Firstly, Portland cement with grade 42.5 was selected to test the mixture ratio of latex cement mortar with the fluidity, flexural strength and compressive strength test to determine the mass ratio of latex cement mortar to m (water): m Cement): m (fine sand): m (ore powder): m (latex powder) = 720: 1 000: 497: 249:30. At the same time, SBS modified bitumen and corresponding grade limestone aggregate were selected. With the combination of Kentberg scattering and Marshall test, the composition of macroporous asphalt mixture was studied. The best combination of latex cement mortar and asphalt mixture Ratio; and then using Marshall test, rutting test, low temperature bending test, freeze-thaw splitting performance, permeability test and tilting coefficient of friction test, the un-grouted macroporous asphalt mixture, grouting health 7 d and 28 d of latex cement The performance of mortar pouring asphalt mixture was evaluated. The test results show that the injection of latex cement mortar can effectively improve the strength of asphalt mixture, high temperature resistance to rutting, water stability, friction performance, and as the health time increases, the strength of pouring specimens will increase. Meanwhile, the addition of latex modifier can improve the influence of cement mortar pouring on the low temperature deformation ability of the mixture.