常用无机盐对溶液表面张力及混凝土性能的影响  

Effect of inorganic salts on surface tension of solutions and properties of concrete

作　　者：葛勇[1] 常传利[1] 杨文萃[1] 张宝生[1] 袁杰[1] 于继寿[1] 

机构地区：[1]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《混凝土》2007年第6期7-9,共3页Concrete

摘　　要：为研究混凝土中常用的无机盐类外加剂对混凝土性能的影响,采用吊环法测试了不同浓度氯化钠、氯化钙、硫酸钠和硝酸钙水溶液和饱和氢氧化钙溶液的表面张力。试验结果表明:加入无机盐两种溶液的表面张力均增大,且表面张力与溶液的浓度基本呈线性关系。并通过理论分析证明表面张力的增大对混凝土的许多性能有着不利作用,特别是对混凝土的塑性收缩、干缩以及早期开裂有十分不利的作用。Surface tension of water and saturated calcium hydroxide solution which added sodium chloride ,calcium chloride, sodium sulfate and calcium nitrate were tested by ring method to study the effects of these salts on concrete performance.The results show that surface tension of both solution increases after the salts added, and it is linear with the concentration of salts in the solution basically.Moreover,the disadvantageous effect of surface tension increasing on performances of concrete, including plastic shrinkage, dry shrinkage and early-age crack of concrete were analyzed.

关 键 词：无机盐 表面张力 干缩 塑性收缩 早期开裂 耐久性 

分 类 号：TU528.042[建筑科学—建筑技术科学]