复合侵蚀条件下水泥砂浆的耐蚀性能研究  

Corrosion resistance performance of cement mortar under the conditions of coupled corrosion

作　　者：陈阳义 潘志华[1] 李洪马 王学兵[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《混凝土》2015年第8期115-119,共5页Concrete

基　　金：国家973项目资助(2011CB013801)

摘　　要：在地下水富含硫酸盐的地区,结构混凝土不仅受到硫酸盐的侵蚀,而且会常常面临干湿循环-硫酸盐-CO2复合侵蚀。在试验室条件下研究了碳化侵蚀、干湿循环-硫酸盐侵蚀以及干湿循环-硫酸盐-CO2复合侵蚀的情况下水泥砂浆的耐蚀性能。试验结果表明:在干湿循环-硫酸盐侵蚀条件下砂浆试样强度呈现先增后降的趋势;硫酸盐-干湿循环-CO2环境对水泥砂浆的侵蚀最为严重;三种试验制度对砂浆试件侵蚀影响大小按龄期分为两个阶段;在干湿循环-硫酸盐侵蚀条件下产生的物质为Na2SO4晶体和钙矾石,在硫酸盐-干湿循环-CO2侵蚀条件下产生的物质为Ca CO3和Na2SO4晶体。In some areas,the groundwater is rich in sulfate.Concrete structures are not only subjected to sulfate attack,but also often face carbonation - dry/wet circulation - sulfate coupled corrosion.It studied the sulfate resistance of cement mortar under following con- ditions,including carbonation corrosion, dry/wet circulation - sulfate coupled corrosion, carbonation - dry/wet circulation - sulfate cou- pled corrosion.Results show that in the dry/wet circulation - sulfate coupled corrosion the strength of mortar samples show a decrease after the first increase. The carbonation - dry/wet circulation - sulfate coupled corrosion showed more severe corrosion degree than any other two corrosion conditions. Erosion of mortar specimens under different experimental system is divided into two stages. Substances produced under conditions of dry/wet circulation - sulfate coupled corrosionare Na2 SOa and ettringite. However, the substances are Ca- CO3 and Na2SO4 under carbonation - dry/wet circulation - sulfate coupled corrosion.

关 键 词：水泥砂浆 复合侵蚀 硫酸盐侵蚀 

分 类 号：TU528.01[建筑科学—建筑技术科学]