宁马城际地下车站侧墙混凝土抗裂技术与应用  

Anti-cracking Concrete Technology and Application for the Side Walls of Ningma Intercity Underground Station

作　　者：孟令锋 徐思睿 MENG Lingfeng;XU Sirui(China Railway Third Bureau Group East China Construction Co.,Ltd,Nanjing Jiangsu 211100 China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.,Ltd,Nanjing Jiangsu 210008China)

机构地区：[1]中铁三局集团华东建设有限公司,江苏南京211100 [2]江苏省建筑科学研究院有限公司,高性能土木工程材料国家重点实验室,江苏南京210008

出　　处：《江苏建筑》2024年第5期59-62,共4页Jiangsu Construction

摘　　要：为解决宁马城际地下车站混凝土早期开裂及渗水的危害,以优选原材料和优化配合比为基础,制备低温升高抗裂混凝土,使其满足7 d绝热温升不超过45℃,28 d自生体积变形仍然超过200με。文章结合工程施工特点,合理设计分段长度,控制施工生产混凝土的温度与工作性能,将其应用至宁马城际板桥站主体结构侧墙中。通过结构中心监测的数据结果表明,与类似结构相比,抗裂混凝土侧墙有效降低结构温升达25%,结构中心处变形远超过对比侧墙。现场持续跟踪3个月,发现应用段侧墙裂缝数量降低率达到75%,裂缝控制效果明显。Based on the selected raw materials and optimization of the mix ratio,low-temperature elevated anti-cracking concrete was made to solve the problem of early cracking and water leakage of concrete in the underground metro station of Ningma Intercity Project.The anti-cracking concrete meets the requirements of a 7-day adiabatic temperature rise of no more than 45°C,and 28-day self-generated volume deformation still exceeded 200με.Combined with the characteristics of the project,the segmented length was reasonably designed,the temperature and working performance of the concrete were controlled,and anti-cracking concrete was applied to the side wall of the main structure of Banqiao Metro Station in Ningma Intercity Project.Compared with similar structures,anti-cracking concrete can effectively reduce the temperature rise of the structure by 25%,and the deformation at the center of the structure is much higher than the reference side walls.After continuous on-site tracking for 3 months,it was found that the number of cracks in the side wall of the application section was reduced by 75%,and the crack control effect was obvious.

关 键 词：地下车站 早期开裂 绝热温升 变形 裂缝控制 

分 类 号：TU528.041[建筑科学—建筑技术科学]