利用干湿交替法对大掺量矿渣硅酸盐水泥砂浆抗硫酸盐性能的研究  

Research on Sulfate Resistance of Cement Mortars with High Volume of Slag by the Wet-dry Cycle Method

作　　者：毕乾[1] 张亚梅[1] 

机构地区：[1]东南大学江苏省土木工程材料重点实验室,南京211189

出　　处：《混凝土与水泥制品》2010年第4期1-5,共5页China Concrete and Cement Products

摘　　要：采用干湿交替的试验方法对大掺量矿渣硅酸盐水泥砂浆的抗硫酸盐侵蚀性能进行了研究。对侵蚀过程中砂浆的体积膨胀率、质量变化以及强度变化进行了测试,并对侵蚀后的砂浆试件进行了微观分析。对比不同侵蚀溶液(分别为Na2SO4溶液和MgSO4溶液)中受侵蚀的砂浆试件发现在短时间浸泡、长时间烘干的循环制度下,在镁盐中受侵蚀的砂浆试件具有较低的膨胀率和质量变化率,强度下降也较小。电镜结果显示在镁盐中受侵蚀的砂浆试件形成了大量无胶凝性的物质,而在Na2SO4溶液中受侵蚀的试件表面孔隙中形成了大量膨胀性的针棒状晶体。The wet-dry cycle method is used to evaluate the sulfate resistance of cement mortars with high volume of slag.Volume expansion ratio,mass change and strength change are examined to evaluate the damage after the mortars are immersed in 5% MgSO4 solution or in 5% Na2SO4 solution.And SEM analysis is taken for the erosive mortar specimens.After 60 cycles with short-time immersion and long-time drying,the specimens immersed in 5% MgSO4 solution show a better condition compared to those immersed in 5% Na2SO4 solution.The SEM photos show that a large amount of non-binding capacity materials had formed inside the mortars immersed in 5% MgSO4 solution.However,a lot of expansive needle shaped crystalline is observed in the pores of those mortars immersed in Na2SO4 solution.

关 键 词：矿渣 水泥砂浆 抗硫酸盐侵蚀 干湿交替 膨胀率 

分 类 号：TU528[建筑科学—建筑技术科学]