高性能混凝土的抗硫酸盐、镁盐侵蚀研究

Study on performance of sulfate and magnesium salt erosion resistance for high performance concrete

结合工程实际,以在4种不同浓度的SO2-4,Mg2+侵蚀溶液中浸泡的普通水泥胶砂试件和掺矿渣微粉高性能混凝土胶砂试件为对比试件进行研究,通过测定和观察试件在浸泡期为28d、2个月、4个月、6个月、8个月、10个月、12个月的强度损失和形态形貌变化,用抗折强度和抗蚀系数来评定其抗侵蚀性能。宏观试验结果表明普通水泥胶砂试件在不同浓度的SO2-4,Mg2+侵蚀溶液中抗侵蚀性能都很差;掺矿渣微粉高性能混凝土胶砂试件抗侵蚀性能优异,在4种侵蚀溶液中侵蚀龄期均大于1年。

In the paper,the effects of sulfate and magnesium salt erosion on ordinary cement mortar samples and high performance concrete cement mortar samples with ground granulated blast furnace slag soaked in 4 density sulfate and magnesium salt solutions are studied.The properity of resistance to sulfate and magnesium salt erosion is evaluated by determining the strength loss and erosion resistence coefficent of all the cement mortar samples for 28 days,2 months, 4 months, 6 months, 8 months,10 months, 1 year. The macroscopical exiperiment result shows ordinary cement mortar samples' properity of resistance to sulfate and magnesium salt erosion is bad in the 4 soultions; on the contrary, high performance concrete cement mortar samples is excellent,and its erosion resistance period in the 4 soultions are all longer than 1 year.