双掺橡胶粒、粉煤灰的再生混凝土基本性能研究  

Study on basic properties of recycled concrete containing crumb rubber and fly ash

作　　者：蒋连接[1,2] 陈建超 郑文新[1] 李思远[1] 王光新[1] 

机构地区：[1]宿迁学院建筑工程系,江苏宿迁223800 [2]西安建筑科技大学土木工程学院,陕西西安710055 [3]南京工程高等职业学校建筑工程系,江苏南京211100

出　　处：《混凝土》2015年第11期65-68,共4页Concrete

基　　金：江苏省高校自然科学研究项目(14KJB560016)

摘　　要：在再生混凝土中双掺橡胶粒和粉煤灰,通过试验研究了橡胶粒、粉煤灰掺量和橡胶粒径对再生混凝土工作性和抗压强度的影响规律,并初步探讨了其作用机理。结果表明:随着橡胶粒或粉煤灰掺量的增加,再生混凝土的坍落度逐渐增强,28d立方体抗压强度不断减小,且粉煤灰对强度的降低幅度大于橡胶粒;由于两者的超叠效应,双掺橡胶粒、粉煤灰的再生混凝土坍落度比单掺或不掺时有较大的提升,而立方体抗压强度则出现较大幅度的下降;在橡胶粒、粉煤灰掺量相同的情况下,随着橡胶粒径的减小,再生混凝土的坍落度和28 d立方体抗压强度均随之降低;双掺橡胶粒、粉煤灰后,再生混凝土仍具有良好的黏聚性和保水性。Mixing crumb rubber and fly ash into recycled concrete, the influence of crumb rubber rate and fly ash rate and rubber size on workability and compressive strength of recycled concrete was studied through the experiment. And the action mechanism was also researched preliminarily. The results show that with the increase in the content of crumb rubber or fly ash, the slump of recycled concrete raises and 28 d cubic compressive strength decreases gradually ,meanwhile the decreasing amplitude of strength caused by fly ash is lar- ger than crumb rubber. Due to synergistic effect, the slump rises and cubic compressive strength drops greatly of recycled concrete con- taining crumb rubber and fly ash. As the amount of crumb rubber and fly ash is under the same condition, both slump and 28 d cubic compressive strength reduce with the decrease of crumb rubber size. Recycled concrete mixed by crumb rubber and fly ash has good ad- hesiveness and water retention.

关 键 词：再生混凝土 橡胶粒 粉煤灰 工作性 立方体抗压强度 

分 类 号：TU528.041[建筑科学—建筑技术科学]