掺聚羧酸系减水剂混凝土泌水影响因素研究  

Influence factors of bleeding on concrete with polycarboxylate superplasticizer

作　　者：陈国新[1,2,3,4] 杜志芹 刘兴荣[1,2,3,4] 祝烨然 CHEN Guoxin;DU Zhiqin;LIU Xingrong;ZHU Yeran(Nanjing Hydraulic Research Institute,Nanjing 210029,China;Nanjing R&D Hi-Tech Co.Ltd.,Nanjing 210024,China;Research Center on New Materials in Hydraulic Structures of Ministry of Water Resources,Nanjing 210029,China;Anhui Ruihe New Materials Co.Ltd.,Maanshan 243000,China)

机构地区：[1]南京水利科学研究院,江苏南京210029 [2]南京瑞迪高新技术有限公司,江苏南京210024 [3]水利部水工新材料工程技术研究中心,江苏南京210029 [4]安徽瑞和新材料有限公司,安徽马鞍山243000

出　　处：《新型建筑材料》2020年第9期63-66,共4页New Building Materials

基　　金：中央级公益性科研院所基本科研业务费专项资金重点基金项目(Y419014)。

摘　　要：针对混凝土实际应用中聚羧酸系减水剂存在的对掺量较敏感,容易泌水离析的问题,对聚羧酸系减水剂本身的分子结构及掺量,以及保坍剂、缓凝剂、黏度调节剂、引气剂等复配组分等影响因素进行了试验研究。结果表明:聚羧酸系减水剂、聚羧酸系保坍剂及缓凝剂的优选对混凝土泌水率有较大影响,黏度调节剂及引气剂的掺加能有效降低混凝土的泌水率。在某船闸工程闸室墙混凝土中,通过上述各组分的合理复配,能将掺聚羧酸系减水剂的中低坍落度混凝土的泌水率控制在1.0%以下,保证工程质量。Aiming at the problem that polycarboxylate superplasticizer is sensitive to dosage and easy to segregate and bleed in application,the molecular structure and dosage of polycarboxylate superplasticizer itself,as well as the influencing factors of slump-retaining agent,retarder,viscosity regulator,air entraining agent and other composite components were studied. The results show that the optimum selection of polycarboxylate superplasticizer,polycarboxylate slump retaining agent and retarder has a great influence on the concrete bleeding rate,and the addition of viscosity regulator and air entraining agent can effectively reduce the concrete bleeding rate. In the concrete of lock chamber wall of a lock project,the bleeding rate of low slump concrete mixed with polycarboxylate superplasticizer is controlled below 1.0% by addition of the above components,which ensures the quality of the project.

关 键 词：聚羧酸系减水剂 混凝土 泌水 船闸工程 

分 类 号：TU528.042[建筑科学—建筑技术科学]