黏度改性剂对机制砂混凝土性能影响的试验研究  

Test research on the effect of viscosity modifier on the performance of concrete with manufactured sand

作　　者：殷继伟 马永胜 张磊 张浩 闻宝联 YIN Jiwei;MA Yongsheng;ZHANG Lei;ZHANG Hao;WEN Baolian(Institute of Technical Information for Building Material,Beijing 100024,China;Beijing Concrete Enjoy Future Engineering Technology Research Institute,Beijing 100024,China;Hebei Expressway Jing-Xiong Planning Establishment,Baoding 071000,China;Henan Shuangjian Technology Development Co.,Ltd.,Luohe 462000,China)

机构地区：[1]建筑材料工业技术情报研究所,北京100024 [2]北京混凝土享未来工程技术研究院,北京100024 [3]河北省高速公路京雄筹建处,河北保定071000 [4]河南双建科技发展股份有限公司,河南漯河462000

出　　处：《混凝土》2022年第6期89-93,共5页Concrete

基　　金：在建桥涵混凝土材料及质量缺陷快速检定技术研究(JX-202018)。

摘　　要：选取了5万黏度HPMC、10万黏度HPMC、黄原胶、瓜尔胶、聚乙烯醇、聚氧化乙烯这6种黏度改性剂,去解决湿法工艺生产机制砂配制混凝土易出现泌水、离析、可泵性差的问题。通过一系列净浆试验、混凝土试验得知,加入HPMC的混凝土有较好的工作性但强度降低明显。黄原胶可大幅度降低混凝土泌水率、离析率,但会使混凝土黏度过大坍落度受到影响。聚乙烯醇明显增加混凝土黏度,但混凝土的泌水率、离析率并未得到良好的改善。聚氧化乙烯作为黏度改性剂使用时,可增加混凝土的保水性但悬浮性较差。瓜尔胶可全面改善混凝土工作性,同时强度不受影响,相较于其他5种黏度改性剂更适合应用在机制砂混凝土中。Selects six viscosity modifiers,including 50000 viscosity HPMC,100000 viscosity HPMC,xanthen gum,guar gum,polyvinyl alcohol and polyethylene oxide,to solve the problems of bleeding,segregation and poor pumping performance of concrete with the manufactured sand by wet process.Through a series of net slurry tests and concrete tests,it is learned that the concrete added with HPMC has good workability,but its strength is significantly reduced.Xanthan gum can greatly reduce the bleeding rate and segregation rate of concrete,but it will cause excessive viscosity and slump of concrete.Polyvinyl alcohol significantly increases the viscosity of concrete,but the bleeding rate and segregation rate of concrete have not been well improved.When polyethylene oxide is used as viscosity modifier,it can increase the water retention of concrete,but the suspension is poor.Guar gum can comprehensively improve the workability of concrete without affecting the strength.Compared with the other five viscosity modifiers,guar gum is more suitable for application in concrete with manufactured sand.

关 键 词：黏度改性剂 坍落度 泌水率 离析率 强度 

分 类 号：TU528.042[建筑科学—建筑技术科学]