混凝土养护期高温的后期强度及宏细观分析  

Later Strength and Macro-meso Analysis of Concrete Under High Temperature During Curing Period

作　　者：王奇灵 盛如意 姚旭朋[1] 张姣龙 刘涛 袁勇[1,3] WANG Qiling;SHENG Ruyi;YAO Xupeng;ZHANG Jiaolong;LIU Tao;YUAN Yong(School of Civil Engineering,Tongji University,Shanghai 200092,China;Shanghai International Port(Group)Co.,Ltd.,Shanghai 200080,China;State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]上海国际港务(集团)股份有限公司,上海200080 [3]同济大学土木工程防灾减灾国家重点实验室,上海200092

出　　处：《建筑施工》2024年第10期1596-1600,共5页Building Construction

基　　金：中德科学基金研究交流中心项目(GZ1574);上海市科学技术委员会项目(21DZ1203505,23DZ1202906);江西省交通运输厅重大工程科技项目(2021C0008)。

摘　　要：研究对经历了养护早期高温混凝土的水化度与后期(10 d)强度开展室内试验,对比分析混凝土在养护温度20、40、60和80℃下养护7d后,继续标养至100d时的水化进程与抗压强度发展规律。同时,引入温度影响因子,分析了后期强度的宏细观作用机理,提出了温度影响因子的确定方法。研究发现:早期高温养护对混凝土后期的水化度影响较小但对强度影响较大;早期养护温度越高,后期强度损失越大。早期高温养护通过改变水化度、C-S-H密度和孔隙体积而影响后期强度。The degree of hydration and the later(10-day)strength of concrete subjected to early high-temperature curing are investigated through laboratory tests.The hydration process and the development of compressive strength of concrete cured at 20℃,40℃,60℃,and 80℃for 7 days and then standard cured until 100 days are compared and analyzed.The temperature influence factor is introduced to analyze the macroscopic and microscopic mechanisms affecting later strength,and a method to determine the temperature influence factor is proposed.Results indicate that early high-temperature curing has minimal impact on the later hydration degree but significantly affects strength.Higher early curing temperatures result in greater strength loss.Early high-temperature curing affects later strength by altering the degree of hydration,C-S-H density,and pore volume.

关 键 词：高温养护 混凝土 后期强度 水化度 

分 类 号：TU528[建筑科学—建筑技术科学]