养护条件对冷击损伤后混凝土收缩和孔隙结构影响研究

打开文本图片集

中图分类号：TV431；TU528 文献标识码：A DOI： 10. 7535/hbgykj. 2025yx06003

Influence of curing conditions on concrete shrinkage and pore structure after cold shock damage

XU Youzhang'，SHEN Wenfeng²，CHEN Naijing³，GAO Xianglong' ，

QIAN Yingjie1，WEI Xiaoyan1，WANG Wei²

（1.ZhejiangTunnelEngineeringGroupCompanyLimited，Hangzhou，Zhejiang 3l0o5，China；2.ColegeofCivilandTrans portation Engineering，Hohai University，Nanjing，Jiangsu 210o98，China；3.Wenzhou Oujiang Water Diversion Development Company Limited，Wenzhou，Zhejiang 325ooo，China）

Abstract：In order to study the impact of temperature and humidity curing environmenton the performance of concrete in highground temperature water conveyance tunnels，thecompresive strength and drying shrinkage of the concreteafter cold shock were investigated.The fects of temperature and humidity couplingonthecompresive strength，shrinkage characteristics，and pore structure of concrete after cold shock damage （CCSD） under two temperatures （ 20°C and 50°C ）and three relative humidity（RH） levels （43% ， 75% ，and 98% ） were analyzed. The results indicate that the elevated temperature andhumiditycuring environmentcanenhance thecompresive strength ofconcrete aftercold shockdamage and mitigate drying shrinkage. It has been demonstrated that elevated temperatures cancause damage to larger pore structures，expand the pore proportion above 600nm and increase the relative mass loss of the system. However，it has also been shown that such temperaturescan promotehydrationreactions，improvetheearlystrengthofconcreteandreducethesensitivitytorelativemass loss.Based onCEB-FIPMC 2O10 model，thedrying shrinkage prediction modelof CCSD is established，whichcanpredictthe drying shrinkageofCCSDacuratelyand efectively.Theaforementioned researchoutcomes oferatheoretical referenceforthe construction and maintenance of diversion tunnels under high ground temperature.

KeyWords：hydraulic structure； temperature humidity coupling；lining structure；drying shrinkage；relative humidity; pore structure

近年来中国建造了大量引水工程，以缓解水资源空间分布不均匀的问题。（剩余12083字）