聚羧酸减水剂复配技术在超长灌注桩混凝土中的应用  

Application of compounding polycarboxylate superplasticizer on pouring concrete of super-long bored piles

作　　者：罗思桥 汪伟 谭博夫 王康明 周明凯[1] 

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,湖北武汉430070 [2]湖北路桥集团有限公司,湖北武汉430000

出　　处：《混凝土》2017年第6期157-160,共4页Concrete

摘　　要：结合某大桥超长灌注桩混凝土夏季施工情况,通过与缓凝剂、消泡剂及引气剂等组分的复合对聚羧酸高性能减水剂进行改性,调节混凝土的工作性,并主要研究不同掺量的消泡剂、引气剂和缓凝剂对混凝土的工作性、凝结时间以及28 d抗压强度的影响。结果表明:通过向HY900型聚羧酸高效减水剂中复配消泡、引气以及缓凝组分,可以显著改善混凝土拌合物和易性,减小混凝土坍落度经时损失,并延长混凝土凝结时间。经过对比试验,确定最佳复配组成为DF-16型消泡剂的掺量为2‰,AZA型引气剂的掺量为3‰,葡萄糖酸钠掺量为6%。In consideration of conditions of a bridge＇ s concrete of super-long bored pile construction in summer, this article studied the influences of different amount of antifoam agent, air entraining agent and retarder on workability, setting time and the compressive strength of 28 d.As the results showed, by compounding antifoam agent, air entraining agent and retarder with HY900 polycarboxylate superplasticizer, workability of concrete improved greatly, loss of slump in 1 h reduced obviously, setting time extended as well.Through the contrast experiment, the best compounding composition can be determined as follow：dosage of antifoam agent （DF-16） is 2‰, dosage of air entraining agent （AZA） is 3‰, dosage of sodium glucose （retarder） is 6%.

关 键 词：超长灌注桩混凝土 聚羧酸减水剂 消泡剂 引气剂 缓凝剂 

分 类 号：TU528.042.2[建筑科学—建筑技术科学]