氟石膏对地坪垫层混凝土补偿收缩性能的影响研究  

Study on the shrinkage compensating performance of fluorgypsum to the base floor concrete

作　　者：刘文斌[1] 周慧[1] 董阳 LIU Wenbin;ZHOU Hui;DONG Yang(Changzhou Vocational Institute of Engineering,Changzhou 213164,China;Nanjing Xujie Construction Technology Co.Ltd.,Nanjing 210067,China)

机构地区：[1]常州工程职业技术学院,江苏常州213164 [2]南京旭洁建筑科技有限公司,江苏南京210067

出　　处：《新型建筑材料》2021年第12期114-117,165,共5页New Building Materials

基　　金：2020年江苏省产学研合作项目(BY2020489);2021年江苏省青蓝工程学术带头人项目。

摘　　要：采用工业氟石膏与水泥相互作用,引入钙钒石体系对地坪垫层混凝土的收缩性进行研究。结果表明,氟石膏的掺入提高了混凝土的早期和后期强度,对混凝土的收缩有抑制作用;氟石膏掺量为水泥质量的5%时,混凝土的28 d收缩率为214×10^(-6),较未掺时降低了60%;减缩剂对抑制地坪垫层混凝土收缩的效果不明显。XRD和SEM分析显示,水化产物中有大量钙钒石生成;孔结构分析显示,掺氟石膏的混凝土中主要以<0.05 mm的微孔为主。工程应用表明,氟石膏的补偿收缩作用可有效控制地坪垫层混凝土的收缩。In this paper,the shrinkage of base floor concreteis studied by using the interaction of industrial fluor gypsum and cement to introduce the Ettringite system.The results show that the addition of fluor gypsum can promote the early and late strength of concrete and restrain the shrinkage of concrete.When the content of fluor gypsum reaches 5%of the cement content,the shrinkage of base floor concrete on the 28 day is 214×10^(-6),and the shrinkage of base floor concrete is reduced by 60%.The shrinkage reducing agent has no obvious effect on the shrinkage of base floor concrete.XRD and SEM analysis showed that there are a lot of Ettringite in the hydration products.The pore structure analysis shows that the distribution of holes in the base floor concrete with fluor gypsum is mainly small holes below 0.05 mm.Engineering application shows that shrinkage compensation can effectively control the shrinkage of base floor concrete.

关 键 词：地坪垫层混凝土 收缩率 氟石膏 减缩剂 

分 类 号：TU478[建筑科学—结构工程]