酸雨侵蚀下水泥基材料的腐蚀损伤与评价——酸雨介质成分的影响

摘要

通过测试长期浸泡在不同酸雨中的混凝土试件相对弹性模量随侵蚀时间的变化,着重研究了酸雨酸度( pH值)及其SO2-4浓度等酸雨侵蚀介质参数对水泥混凝土抗酸雨侵蚀能力的影响.研究结果表明:在酸雨静态长期浸泡环境下,水泥基材料表面和内部腐蚀损伤程度及速率与酸雨侵蚀介质H+和SO2-4浓度以及产生的腐蚀产物有关；在酸雨介质其它离子成分保持不变的情况下,酸雨pH值和SO2-4对受酸雨腐蚀后的水泥混凝土表面性能及其内部微观结构有着十分明显的影响,并且从酸雨侵蚀破坏过程来看,各水泥混凝土随着酸雨中的H+和SO2-4浓度的增加而腐蚀越来越严重.%Variations of relative elastic modulus with deterioration duration of cement-concrete specimens immersed for long time in different simulated acid rain solutions were measured, and effects of H+ and SO42- concentrations, etc. On corrosion-resistance of cementitious materials under the acid rain attack were investigated particularly. The experiment results show that the deterioration extent and rate of the outer layer and inner layer of cementitious materials are related to H+ and SOO42- concentrations in the acid rain and their corrosion products under conditions of long-term acid rain immersion. If other components of acid rain remain unchanged, H+ and SO42- concentrations in the acid rain have great impacts on inner microstructures and surface properties of cement-concrete cementitious materials under the acid rain attack. The deterioration of cement-concrete cementitious materials becomes more and more serious with increasing H + and SO42- concentrations in the acid rain from the process of deterioration.