机制砂中石粉含量对混凝土抗渗性能的影响  

Effects of micro-fines on impermeability of manufactured-sand concrete

作　　者：李婷婷[1] 王稷良[2] 郑国荣 周明凯[1] 李北星[1] 

机构地区：[1]武汉理工大学硅酸盐工程中心教育部重点实验室,湖北武汉430070 [2]交通部公路科学研究院,北京100088 [3]吉茶高速公路建设开发有限公司,湖南湘西416000

出　　处：《混凝土》2009年第3期35-37,共3页Concrete

摘　　要：随着天然砂的日益短缺,机制砂已成为建设用砂的重要来源,针对机制砂中石粉含量,目前各国标准最高限值存在较大差异。通过研究石粉含量对C30、C60、C80混凝土工作性、强度、抗渗性能的影响,得出了不同强度机制砂混凝土石粉含量最佳值,试验表明：低强混凝土的最佳石粉含量介于10%~15%之间,高强混凝土的最佳石粉含量介于7%~10%之间,而超高强机制砂混凝土的最佳石粉含量介于3%~5%之间。With the growing shortage of natural sand, manufactured-sand become an important source of sand.According to the top limited content of micro-fines in manufactured-sand, there are great differences in the standard of every country.The effects of the different content mi- cro-fines in manufactured-sand on the compressive strength, working performance,impermeability in different strength grade concrete are re- searched.The result shows that：Optimum content of micro-fines of low-strength concrete is within 10%-15%, optimum content of micro-fines of high-strength concrete is within 10%-15%, and optimum content of micro-fines of super high-strength concrete is within 3%-5%.

关 键 词：机制砂 石粉 抗渗性能 

分 类 号：TU528.041[建筑科学—建筑技术科学]