膨胀剂对中低温环境C60薄壁混凝土结构抗裂性能的影响  

Influence of expansive agents on the crack resistance performance of C60 thin-walled concrete structures in medium and low temperature environments

作　　者：肖圆 赵娟 王丙垒 张登科 程福星 纪宪坤 XIAO Yuan;ZHAO Juan;WANG Binglei;ZHANG Dengke;CHENG Fuxing;JI Xiankun(Hanchuan Zhongdu Concrete Co.Ltd.,Xiaogan 431600,China;Wuhan Yuanjin Building Materials Technology Co.Ltd.,Wuhan 430083,China;Wuhan Sanyuan Special Building Materials Co.Ltd.,Wuhan 430083,China;China Building Materials Academy,Beijing 100024,China)

机构地区：[1]汉川中都混凝土有限公司,湖北孝感431600 [2]武汉源锦建材科技有限公司,湖北武汉430083 [3]武汉三源特种建材有限责任公司,湖北武汉430083 [4]中国建筑材料科学研究总院,北京100024

出　　处：《新型建筑材料》2025年第4期48-54,共7页New Building Materials

基　　金：河南省住房城乡建设科技计划项目(HNJS-2022-K24)。

摘　　要：对比4种不同膨胀剂对C60混凝土自生体积变形的影响,评价其抗裂性能,并将优选方案应用于武汉某建筑地下工程主楼外墙。结果表明:掺量均为6%时,掺入钙质膨胀剂早期膨胀快,短期抗裂性能最优;镁质膨胀剂膨胀较均匀,长期抗裂性能最优;钙镁复合膨胀剂(CMEA)早期膨胀快,长龄期仍能保持均匀膨胀,但抗裂性能较差。CMEA掺量由6%增至10%时,混凝土7、28 d净膨胀分别增大了99.3%、95.4%,且抗裂性能佳。工程应用验证了采用掺10%CMEA的补偿收缩混凝土能提高墙体的抗裂性能。The effect of four different expansive agents on the autogenous volume deformation of C60 concrete was compared,and their crack resistance performance was evaluated.The optimal solution was then applied to the exterior wall of the main building in an underground project in Wuhan.The results show that when the dosage is 6%for all types of expansive agents,the calciumbased expansive agent has rapid early expansion and the best short-term crack resistance.The magnesium-based expansive agent has more uniform expansion and the best long-term crack resistance.The calcium-magnesium composite expansive agent (CMEA) has rapid early expansion and can maintain uniform expansion over a long period,but its crack resistance is relatively poor.When the dosage of CMEA is increased from 6%to 10%,the net expansion of the concrete at 7 and 28 days increases by 99.3%and 95.4%respectively,and the crack resistance is the best.The engineering application has verified that using 10%CMEA in compensating shrinkage concrete can improve the crack resistance of the wall.

关 键 词：C60混凝土 膨胀剂 自生体积变形 膨胀历程 地下室外墙 

分 类 号：TU528[建筑科学—建筑技术科学]