两种层状硅酸盐改性沥青混合料的老化性能

Aging Properties of Two Layered Silicate Modified Asphalt Mixtures

为研究不同类型层状硅酸盐对沥青混合料抗老化性能的影响,分别采用有机蒙脱土(OMMT)和有机累托石(OREC)制备了层状硅酸盐改性沥青混合料。采用室内加速老化试验模拟了层状硅酸盐改性沥青混合料的热氧老化和紫外光老化过程。通过路用性能试验,基于不同老化性能指标评价了两种层状硅酸盐改性沥青混合料的抗老化性能。结果表明,OMMT和OREC均能改善沥青混合料的抗热氧和抗紫外光老化性能,其中OMMT对沥青混合料抗老化性能的改善效果更好。此外,OMMT和OREC改性沥青混合料的高温稳定性和水稳定性得到提高,且紫外光老化后的低温抗开裂性能也有所改善。

In order to study the effect of different layered silicates on the anti-aging properties of asphalt mixture,organic montmorillonite(OMMT)and organic rectorite(OREC)were used to prepare layered silicate modified asphalt mixtures.The thermo-oxidative and ultraviolet aging properties of layered silicate modified asphalt mixtures were simulated through indoor accelerated aging tests.The road performance tests were applied to evaluate the anti-aging properties of layered silicate modified asphalt mixtures based on different aging indexes.The results show that both OMMT and OREC can improve the thermo-oxidative aging resistance and ultraviolet aging resistance of asphalt mixtures,and OMMT has a better improvement effect on the aging resistance of asphalt mixture than OREC.Additionally,the high-temperature stability and water stability of OMMT and OREC modified asphalt mixtures are improved,and the low-temperature cracking resistance is also improved after ultraviolet aging.