建筑用新型阻水剂对清水混凝土结构渗透性的改善及其机理  

Permeability improvement of the fair-faced concrete structure and its mechanism with new water blocking agent for building

作　　者：张慧娜[1] 张广兴[2] ZHANG Huina;ZHANG Guangxing(Renai College,Tianjin University,Tianjin 301636 China;China Railway Eighteen Bureau Group Survey and Design Institute,Tianjin 300222,China)

机构地区：[1]天津大学仁爱学院,天津301636 [2]中铁十八局集团勘察设计院,天津300222

出　　处：《混凝土》2020年第1期150-154,共5页Concrete

基　　金：国家自然科学基金资助(51478278)

摘　　要：为了探究新型阻水剂对混凝土渗透性的改善及其作用机理,测试了掺量为1.0%、1.5%、2.0%阻水剂在混凝土中抗压强度、吸水率、渗透高度比,分析了硬化浆体的物相组成和微观形貌。结果表明:(1)阻水剂掺量为1.5%(LS2)时的混凝土试件强度发展最好,28 d抗压强度较对比组增加了7.15%;(2)LS2的吸水率、渗透高度比较对比组均有所改善,28 d吸水率、渗透高度比均降低4.8%和38%;(3)含阻水剂的混凝土硬化浆体,水化产物结晶点较对比组增多,排列紧密,结构整体较对比组明显致密。To investigate the improvement of the permeability of new water blocking agents to concrete and its mechanism of action,the strength,the rate of water absorption and the ratios of penetration height were tested with the content of 1.0%,1.5%and 2.0%of water blocking agents in concrete.The phase composition and microscopic morphology of the hardened paste were analyzed.The results show that(1)The strength of concrete specimens with water-blocking agent content of 1.5%(LS2)is the best,and the compressive strength at 28 days is increased by 7.15%compared with the control group.(2)Compared with the control group,the water absorption and the ratio of penetration height of LS2 were all improved,the rate of water absorption and the ratio of penetration height LS2 respectively decreased by 4.8%and 38%.(3)The hardened concrete slurry containing water-blocking agent had more crystallization points than the control group,and the crystallization points closely arranged,and the overall structure was significantly denser than the control group.

关 键 词：新型阻水剂 清水混凝土 渗透性 作用机理 

分 类 号：TU528.01[建筑科学—建筑技术科学]