超早强混凝土配制及耐久性研究  

Study on proportions and durability of ultra high early strength concrete

作　　者：张国志[1,2] 李顺凯[1,2] 屠柳青[1,2] 

机构地区：[1]中交武汉港湾工程设计研究院有限公司,湖北武汉430071 [2]长大桥梁建设施工技术交通行业重点实验室,湖北武汉430071

出　　处：《混凝土》2010年第3期134-138,共5页Concrete

摘　　要：超早强混凝土在公路、桥梁、港口等工程的维修加固中具有广泛的市场应用前景。采用42.5级硫铝酸盐水泥、聚羧酸减水剂、0.28-0.32的W/C、适宜的缓凝剂和早强剂,配制出了12h抗压强度大于35MPa,28d抗压强度大于50MPa,且施工性能优良的超早强混凝土。长期收缩和耐久性试验表明,其自收缩与C50普通混凝土相当,最大干缩〈300με;徐变与普通混凝土相当;抗硫酸盐侵蚀、抗氯盐侵蚀、抗碳化和抗磨蚀性能等耐久性能良好。Ultra high early strength concrete（UHESC）is extensively used in maintain and reinforcement of bridge,highway and harbour engineering in the word.UHESC,which 12 h compressive strength is larger than 35 MPa and 28 d compressive strength is larger than 50 MPa,is manufactured in laboratory using 42.5 sulphoaluminate cement,polycarboxylate superplasticizer,0.28-0.32 W/C,appropriate retarder and early strength agent.Long term shrinkage and durability tests show that,the creep and autogenous shrinkage of UHESC is almost the same as that of the C50 ordinary concrete,the shrinkage maximum value is lower than 300 με;Durability properties including sulphate resistance,chloride resistance,carbonation resistance and abrasion is satisfactory.

关 键 词：超早强混凝土 胶凝材料 干缩 耐久性 

分 类 号：TU528.01[建筑科学—建筑技术科学]