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根据酸雨的特点配制了5种具有不同pH值、不同硫酸根离子浓度的酸性溶液,研究了混凝土在干湿循环、酸性溶液侵蚀30 d到150 d强度的变化、表层混凝土的吸水性以及其孔结构的变化。经过含有硫酸盐溶液的侵蚀后,混凝土强度的变化经过一个先降后升、然后再降低的过程;而经过不含硫酸盐溶液的侵蚀后,混凝土的强度持续下降。受不含硫酸根离子的酸性溶液侵蚀后,表层混凝土的孔隙结构变化较大,孔隙率增加、孔径增大。硫酸盐侵蚀产物的形成过程与混凝土的宏观性能的变化密切相关。
According to the characteristics of acid rain, five kinds of acidic solutions with different pH values and different sulfate ion concentrations were prepared. The changes of the strength of concrete during 30 d to 150 d after wet and dry cycles and acid solution erosion were studied. The water absorption of surface concrete and its pore Structural changes. After erosion with sulphate solution, the strength of the concrete changes after a process of first descending, then descending, and the strength of the concrete continues to decline after erosion without sulphate solution. After being corroded by acidic solution without sulfate ion, the pore structure of surface concrete changed greatly, porosity increased and pore size increased. The formation process of sulfate erosion products is closely related to the change of macroscopic properties of concrete.