干燥条件下老化混凝土内部含湿量演变规律研究  

Research on the Evolution Law of Internal Moisture Content of Aging Concrete Under Dry Conditions

作　　者：蒋建华[1] 师效哲 吴琦 卢宸宸 周家冰 JIANG Jianhua;SHI Xiaozhe;WU Qi;LU Chenchen;ZHOU Jiabing(College of Civil and Transportation Engineering,Hohai University,Nanjing,Jiangsu 210024,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210024

出　　处：《河北工程大学学报(自然科学版)》2025年第1期26-32,共7页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：国家自然科学基金资助项目(51408192);河海大学中央高校基本科研业务费专项资金资助项目(B200202232)。

摘　　要：为研究既有结构表层混凝土老化对混凝土内外湿度响应的影响,以海洋大气环境为背景,开展了碳化、氯盐侵蚀以及两者共同作用后混凝土的快速失水和反向湿度响应试验研究。试验结果表明,混凝土失水速率峰值随着碳化龄期和氯盐掺量增加均呈现先减小后增大的趋势,其中碳化14 d和氯盐掺量为1.5%时,混凝土失水速率峰值最小。碳化和氯盐侵蚀共同作用后混凝土失水速率低于两者单独作用后的混凝土失水速率。混凝土反向湿度响应随着碳化龄期和氯盐掺量增加均呈现先减缓后加快的趋势。碳化与氯盐侵蚀共同作用后混凝土反向湿度响应较两者单独作用后有所减缓。To investigate the effect of aging of surface concrete on the internal and external humidity response of existing structures,experiments were conducted on carbonation,chloride salt erosion,and the rapid dehydration and reverse humidity response of concrete after their combined action in the marine atmospheric environment.The experimental results show that the peak water loss rate of concrete decreases first and then increases with the increase of carbonation age and chloride salt content.Among them,the peak water loss rate of concrete is the smallest when the carbonation age is 14 days and the chloride salt content is 1.5%.The water loss rate of concrete after the combined action of carbonation and chloride erosion is lower than that after the separate action of the two.The reverse humidity response of concrete shows a trend of first slowing down and then accelerating with the increase of carbonation age and chloride content.After the combined action of carbonation and chloride erosion,the reverse humidity response of concrete is slowed down compared to when they act alone.

关 键 词：混凝土 碳化 氯盐侵蚀 反向湿度响应 演变规律 

分 类 号：TU528[建筑科学—建筑技术科学]