钨酸锆填料与沥青的粘附与水损害特性

Adhesive bond and moisture damage mechanism of asphalt mastic made with zirconium tungstate

为分析亲水性钨酸锆材料作为沥青混合料填料的合理性,基于表面能和粘附功理论,对不同填料和沥青的表面能参数及粘附功进行测试和计算,通过设计水侵蚀试验,研究不同填料组成的沥青胶浆在水损害条件下的自由能和拉拔强度变化规律.试验结果表明:钨酸锆填料具有更大的Lewis碱和范德华表面能分量,基质沥青则具备比SBS改性沥青更大的Lewis酸碱和范德华表面能分量;在干燥状态下,钨酸锆替代矿粉作为填料,可提高其与沥青的粘附功,进而提高沥青胶浆拉拔强度;在有水侵蚀下,钨酸锆沥青胶浆具有更大的表面自由能变化,水更倾向于取代基质沥青与钨酸锆浸润.钨酸锆沥青胶浆比矿粉胶浆具有稍差的耐水损害能力.

To investigate the rationality of zirconium tungstate（ ZT） with hydrophilia property as the filler of asphalt mixture,the surface energy parameters and work of adhesion for different fillers and binders were investigated based on the surface energy and adhesive work theory. A moisture conditioning test method applied to asphalt mastic was proposed,and then the variations of surface energy and pull-off strength of asphalt mastics were studied. Test results indicate that ZT has larger Lewis basic component and Lifshitz van der Waals component,and 70# asphalt has larger Lewis basic and acid component and Lifshitz van der Waals component when compares to SBS asphalt. ZT presents stronger adhesive bond to asphalt at dry condition than mineral filler. However,water may be easier to enter into the interface between ZT and asphalt,and replace the asphalt film on the surface of filler. Asphalt mastic made with ZT shows the worse moisture damage resistance when compares with asphalt mastic made with normal mineral filler.