足尺模型中膨胀剂的收缩补偿耦合场分析  

Analysis of Shrinkage Compensation Coupling Field of Expansion Agent in Full⁃scale Model

作　　者：吴家有 朱国军 隋玉朋 王丙垒 刘拼 WU Jiayou;ZHU Guojun;SUI Yupeng;WANG Binglei;LIU Pin(Guangxi China West Construction Group Co.,Ltd.,Nanning,Guangxi530009,China;Wuhan Sanyuan Special Building Materials Co.,Ltd.,Wuhan,Hubei430083,China;China 22 MCC Group Co.,Ltd.,Tangshan,Hebei063000,China)

机构地区：[1]广西中建西部建设有限公司,广西南宁530009 [2]武汉三源特种建材有限责任公司,湖北武汉430083 [3]中国二十二冶集团有限公司,河北唐山063000

出　　处：《施工技术（中英文）》2023年第10期50-54,共5页Construction Technology

基　　金：河北省建设科技研究项目指导计划(2022-2158)。

摘　　要：为分析大体积混凝土材料水化热引起的温度场变化对结构补偿收缩进程的影响,基于实体足尺模型试验对镁、钙两种膨胀材料进行测试。在温敏、湿敏、水化进程等耦合因素场作用下,通过在实体足尺寸模型中不同点位预埋传感器,收集镁、钙膨胀材料水化反应进程的数据并进行分析。结果发现钙类膨胀剂与混凝土自有组分水化放热进程相近,使混凝土内部升温并加速反应速率,后期干缩补偿有效性受限;镁类膨胀剂减缓反应速率,反应周期延长且水化产物稳定,对后期补偿有效性大;镁类膨胀材料配制的补偿收缩混凝土补偿收缩能力更好。In order to analyze the effect of temperature field changes caused by the heat of hydration of bulk concrete materials on the structural compensation shrinkage process,two expansion materials,magnesium and calcium,were tested based on the solid full⁃scale model test.The data on the hydration reaction process of magnesium and calcium expansion materials were collected and analyzed by pre⁃embedding sensors at different points in the solid full⁃scale model under the action of coupled factor fields of temperature sensitivity,moisture sensitivity and hydration process.The results show that the calcium expansion agent is similar to the exothermic process of hydration of the concrete’s own components,which makes the concrete warm up internally and accelerates the reaction rate,and the effectiveness of the later dry shrinkage compensation is limited.The magnesium expansion agent slows down the reaction rate,prolongs the reaction period and stabilizes the hydration products,which is more effective for the later compensation.The compensated shrinkage concrete formulated by magnesium expansion material has better shrinkage compensation ability.

关 键 词：混凝土 膨胀剂 足尺模型 收缩补偿 温度场 

分 类 号：TU528[建筑科学—建筑技术科学]