低强度等级自密实钢管混凝土专用外加剂的开发和应用  

Development and Application of Special Additive for Low Strength Grand Steel Self-compacting Concrete

作　　者：漆春生 洪斌 齐应明[2] 孙二建 李超[4] 

机构地区：[1]武汉新港投国际集装箱有限公司,430070 [2]中交第二航务工程局有限公司,武汉430070 [3]中建港务建设有限公司,上海200000 [4]武汉理工大学材料学院,430070

出　　处：《混凝土与水泥制品》2014年第12期9-12,共4页China Concrete and Cement Products

基　　金：湖北省交通运输厅科技项目(2013-731-1-2)

摘　　要：通过选用适宜的酯类聚羧酸减水剂母液,采用葡萄糖酸钠、纳米Si O2、有机硅进行复配,研制出一种高减水率、低引气量、保塑性好、适于低强度等级自密实混凝土的专用外加剂,实现了低胶凝材料用量下混凝土的高流动性与低含气量的匹配设计。配制C30自密实混凝土时,其最佳掺量为1.2%~1.6%。所配制的混凝土具有良好的工作性能,不离析、不泌水,满足自密实混凝土泵送施工工艺要求,并成功应用于武汉阳逻港深水薄壁大直径钢管桩中。In order to design high fluidity and low air content concrete, proper ether-type polycarboxylate water reducer mother liquor, sodium gluconate, nano silicium dioxide and organosilicone are used to prepare a type of admixture with high water reduction rate, low air entraining content and good slump-retaining property, which is suitable for lower strength grade self-compacting concrete. In the preparation of C30 self-compacting concrete, the best dosage of this admixture is 1.2%~1.6%. The concrete containing this type of admixture has well work ability, no segregation and no bleeding, which can meet the need of pumping construction technology of self-compacting concrete and is successfully applied in deepwater port with thin wall and large diameter steel pipe pile in Yangluo of Wuhan.

关 键 词：自密实混凝土 专用外加剂 高减水率 低引气量 

分 类 号：TU528.042[建筑科学—建筑技术科学]