沥青胶浆-集料界面水盐侵蚀损伤规律研究

Study on Water and Salt Erosion Damage of Asphalt Mortar-Aggregate Interface

沥青路面的水盐侵蚀是导致其性能劣化、服役寿命缩短的主要原因之一,为研究沥青混合料的水盐侵蚀损伤规律,本工作以沥青胶浆、沥青胶浆-集料界面为研究对象,研究了填料的物理化学特性对沥青胶浆流变性能与渗透性的影响,分析了沥青胶浆-集料界面在不同侵蚀工况(静态浸水、压力浸水)下界面强度的衰减规律。结果表明:填料类型对沥青胶浆的复数模量影响不大,但是其孔隙状态与比表面积对沥青胶浆的相位角与渗透性影响显著。相比于普通浸水,盐溶液侵蚀对沥青胶浆-集料界面强度衰减有显著促进作用,而其衰减速率受集料和填料的物理(孔隙体积、比表面积、微观形貌)、化学(矿物组成、化学成分)特性的综合影响。水压力的作用会加速沥青胶浆-集料界面强度的衰减,表明行车荷载产生的动水压力会推动沥青路面的水损害进程。

The water and salt erosion of asphalt pavement is one of the main reasons for its performance deterioration and service life attenuation. In order to study the erosion damage law of water and salt in asphalt mixture, taking asphalt mortar and asphalt mortar-aggregate interface as the research objects, this work studied the influence of the physical and chemical properties of filler on the rheological properties and permeability of asphalt mortar and analyzed the attenuation law of interface strength of asphalt mortar-aggregate under different erosion conditions(static immersion and pressure immersion). It is found that the type of filler has little effect on the complex modulus of asphalt mortar, but its pore state and specific surface area have significant effects on the phase angle and permeability of asphalt mortar. Compared with ordinary immersion, salt solution erosion can significantly promote the strength attenuation of asphalt mortar-aggregate interface, and its attenuation rate is comprehensively affected by the physical(pore volume, specific surface area, micro morphology) and chemical(mineral composition, chemical composition) cha-racteristics of aggregate and filler. The effect of water pressure will accelerate the attenuation of asphalt mortar-aggregate interface strength, indicating that the dynamic water pressure generated by driving load will promote the water damage process of asphalt pavement.