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顾炳伟^{1 , 3}  ,  王景正¹  ,  龚致远¹  ,  韩沛沛²  ,  邹金丽¹

 

( 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)

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。

关键词：超高性能混凝土 ；组成 ；养护方式 ；早期收缩

中图分类号：TU528 . 31            

文献标志码：A            

文章编号： 1005- 8249  (2025)  02- 0011- 07

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .02.003

 

GU Bingwei ^{1 , 3}  ,  WANG Jingzheng¹  ,  GONG Zhiyuan¹  ,  HAN Peipei2 ,  ZOU Jinli ¹

(1 . College of Civil and Harbor Engineering ,  Jiangsu Ocean University ,  Lianyungang 222005 ,  China;

2. Jiangsu Hanneng Electric Corporation Limited ,  Lianyungang 222300 ,  China;  3 . Jiangsu  Ocean

Engineering Research Center for Intelligent Infrastructure Construction ,  Lianyungang 222005 ,  China)

Abstract: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 7d 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 3d, and the shrinkage from 3d to 7d 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.

Key words:ultra-high performance concrete; constituent; curing method; early shrinkage

作者简介：顾炳伟  (1966—) , 男，博士，教授，研究方向： 土木工程材料的教学与研究、固体废弃物的建材资源化利用。

收稿日期：2024 - 10 - 31