超高性能混凝土早期收缩性能的研究  

Study on Early Shrinkage of Ultra-high Performance Concrete

作　　者：顾炳伟 王景正 龚致远 韩沛沛 邹金丽 GU Bingwei;WANG Jingzheng;GONG Zhiyuan;HAN Peipei;ZOU Jinli(College of Civil and Harbor Engineering,Jiangsu Ocean University,Lianyungang 222005,China;Jiangsu Hanneng Electric Corporation Limited,Lianyungang 222300,China;Jiangsu Ocean Engineering Research Center for Intelligent Infrastructure Construction,Lianyungang 222005,China)

机构地区：[1]江苏海洋大学土木与港海工程学院,连云港222005 [2]江苏瀚能电气有限公司,连云港222300 [3]江苏省海洋工程基础设施智能建造工程研究中心,连云港222005

出　　处：《粉煤灰综合利用》2025年第2期11-17,共7页Fly Ash Comprehensive Utilization

摘　　要：为解决超高性能混凝土(UHPC)早期开裂的问题,研究了不同组成、不同养护方式下UHPC的早期收缩情况。结果表明:UHPC早期收缩存在一个临界水胶比,水胶比小于临界水胶比时,UHPC早期收缩随水胶比增大而增大,水胶比大于临界水胶比时,其收缩随水胶比的增大而减小;粉煤灰与矿渣粉对UHPC早期收缩影响表现相似,随掺量的增加收缩减小,且粉煤灰抑制收缩的效果优于矿渣粉;硅灰掺量增加,UHPC早期收缩增大;钢纤维对抑制UHPC早期收缩有明显效果;不同养护方式下UHPC的7 d总收缩,以热水养护最大,标准养护次之,自然养护最小;4种养护制度在前3 d产生的收缩均十分明显,在3~7 d期间,热水养护产生的收缩较小,因此,实际工程中前期适当进行热水养护,对后期抑制收缩发展有利。The shrinkages of UHPC specimens with different constituent in different curing methods were measured by contact method in order to solve the crack problem of UHPC at early stage.The results show that there is a critical water-binder ratio for the early shrinkage of UHPC,when the water-binder ratio is less than the critical water-binder ratio,the shrinkage of UHPC increases with the increase of water-binder ratio,and decreases with the increase of water-binder ratio when the water-binder ratio is larger than the critical water-binder ratio.The effect of fly ash and slag powder on early shrinkage of UHPC is similar.The shrinkage decreases with the increase of the dosage of fly ash and slag powder,the effect of fly ash on early shrinkage control is better than that of slag powder.The early shrinkage of UHPC increases with the addition of silica fume.There is the obvious effect of steel fiber on early shrinkage control of UHPC.The total shrinkage of UHPC in 7 d is the highest in hot water curing,the second in standard curing,and the lowest in natural curing.The shrinkage of the four curing methods is very obvious in the first 3 d,and the shrinkage from 3 d to 7 d in hot water curing is the smallest in four curing methods.Therefore,the proper hot water maintenance in the early stage of the actual project is beneficial to the late development of shrinkage inhibition.

关 键 词：超高性能混凝土 组成 养护方式 早期收缩 

分 类 号：TU528.31[建筑科学—建筑技术科学]