河北工业科技2025，Vol.42Issue(6)：517-523,7.DOI:10.7535/hbgykj.2025yx06003
养护条件对冷击损伤后混凝土收缩和孔隙结构影响研究
Influence of curing conditions on concrete shrinkage and pore structure after cold shock damage
摘要
Abstract
In order to study the impact of temperature and humidity curing environment on the performance of concrete in high ground temperature water conveyance tunnels,the compressive strength and drying shrinkage of the concrete after cold shock were investigated.The effects of temperature and humidity coupling on the compressive strength,shrinkage characteristics,and pore structure of concrete after cold shock damage(CCSD)under two temperatures(20℃and 50℃)and three relative humidity(RH)levels(43%,75%,and 98%)were analyzed.The results indicate that the elevated temperature and humidity curing environment can enhance the compressive strength of concrete after cold shock damage and mitigate drying shrinkage.It has been demonstrated that elevated temperatures can cause damage to larger pore structures,expand the pore proportion above 600 nm and increase the relative mass loss of the system.However,it has also been shown that such temperatures can promote hydration reactions,improve the early strength of concrete and reduce the sensitivity to relative mass loss.Based on CEB-FIP MC 2010 model,the drying shrinkage prediction model of CCSD is established,which can predict the drying shrinkage of CCSD accurately and effectively.The aforementioned research outcomes offer a theoretical reference for the construction and maintenance of diversion tunnels under high ground temperature.关键词
水工结构/温湿耦合/衬砌结构/干燥收缩/相对湿度/孔隙结构Key words
hydraulic structure/temperature humidity coupling/lining structure/drying shrinkage/relative humidity/pore structure分类
建筑与水利引用本文复制引用
徐友樟,沈文峰,陈乃静,高向龙,钱英杰,魏晓彦,王伟..养护条件对冷击损伤后混凝土收缩和孔隙结构影响研究[J].河北工业科技,2025,42(6):517-523,7.基金项目
中央高校基本科研业务费专项资金(B250201152) （B250201152）
