纳米改性沥青的制备及其混合料路用性能研究

Preparation of Nano-modified Asphalt Binder and Its Pavement Performance

为了评价纳米材料对SBS沥青性能及其混合料性能的影响,采用表面活性剂对纳米材料进行改性,改变了纳米粒子的表面性质,使其在沥青中可以均匀分散和稳定存在。当纳米CaCO 3、纳米ZnO和纳米TiO 2的质量比为1∶2∶1,表面活性剂质量分数为1.5%~2.0%,交联剂质量分数为0.4%时,对SBS沥青的改性效果最好。相较于SBS改性沥青混合料,纳米改性沥青混合料的冻融劈裂强度比、车辙试验的动稳定度和低温抗开裂能力有所提高,残留稳定度变化不大。沥青混合料的高低温性能和水稳定性均得到改善。同时,在光照不足的密闭环境中,纳米改性沥青对汽车尾气也有一定的降解作用。

In order to evaluate the influence of nanomaterials on the performance of SBS modified asphalt binder and the mixture,the nanomaterials were modified with surfactants to change the surface properties of nanoparticles so that they can be uniformly dispersed and stable in asphalt.When the mass ratio of nano-CaCO 3,nano-ZnO and nano-TiO 2 is 1∶2∶1,the content of surfactant is 1.5%-2.0%,and the content of cross-linking agent is 0.4%,the effect of modification with SBS is the best.Compared with SBS modified asphalt mixture,the freeze-thaw splitting strength ratio of nano-modified asphalt mixture,the dynamic stability of rutting test and crack resistance at low temperature improve,but the residual stability does not change much.The performance of asphalt mixture at high and low temperatures improves,so does the moisture susceptibility.