沥青混合料耐盐溶液浸蚀性能研究

通过测定盐溶液浸蚀条件下的沥青与集料粘附性、沥青混合料残留稳定度、冻融劈裂等试验，对比分析了不同沥青种类和不同盐溶液浓度对沥青混合料材料水稳定性的影响，并结合化学-力学耦合理论分析了盐分对沥青混合料侵蚀机理。实验结果表明，SBS改性沥青与集料的粘附性及耐盐浸蚀性能明显优于普通道路石油沥青，在沥青中预拌消石灰对改善粘附性作用不明显；Na2SO4溶液对沥青与集料粘附性的浸蚀作用大于NaCl溶液；沥青与集料粘附性破坏属于化学-力学耦合损伤效应；沥青混合料随空隙率的增大，稳定度和残留稳定度降低，但流值变化规律不确定；初始的内部缺陷和损伤会导致沥青混凝土冻融劈裂抗拉强度的较大幅度降低。

Performance Study of Asphalt Mixture Corroded by Saline Solution

The adhesion between asphalt and aggregat,residual stability of asphalt mixture and the freeze-thaw splitting are tested sfter salt solution immersion. The influence of different asphalt and different salt solution for asphalt mixture is comparative analysed. The erosion mechanism of salt to asphalt mixture is discussed by chemical-mechanical coupling theory. The experimental results show that： the adhesion between SBS modified asphalt and aggregate and Salt erosion resistance excel ordinary road petroleum asphalt evidently. The adhesion function of asphalt preblended slaked lime is non constat. Erosion effect of Na2SO4solution is more obvious than NaC1 solution. Adhesion destruction between asphalt and aggregate belongs to the damage effects of chemical mechanical coupling. Stability and residual sta- bility decrease by the increase of the void content of asphalt mixture, but the flow variation is uncertain. The initial internal defects and damage in asphalt concrete cause the freeze-thaw splitting tensile strength greatly reduce.