苏州轨道交通工程超长梁板结构裂缝控制关键技术  

Key technology for crack control of super-long beam-slab structure in Suzhou rail transit engineering

作　　者：王德民 郭耀雄 潘玮璠 谷亚军 方博 辜振睿 WANG Demin;GUO Yaoxiong;PAN Weifan;GU Yajun;FANG Bo;GU Zhenrui(Wuhan Sanyuan Special Building Materials Co.Ltd.,Wuhan 430083,China;Suzhou Rail Transit Group Co.Ltd.,Suzhou 215004,China)

机构地区：[1]武汉三源特种建材有限责任公司,湖北武汉430083 [2]苏州市轨道交通集团有限公司,江苏苏州215004

出　　处：《新型建筑材料》2022年第1期49-52,共4页New Building Materials

摘　　要：高性能膨胀剂具有早期膨胀能大、水化反应需水量小的特点,用其配制的补偿收缩混凝土在合理的浇筑施工和养护措施下,能够大幅度提高轨道交通工程超长梁板结构的裂缝控制效果。试验结果表明,在苏州轨道交通工程胥口车辆段上盖二层梁板混凝土内温度修正后微应变在3 d内达到最大值(+50~+100με),在30 d后降至-100~-20με,膨胀组分在早期产生的膨胀量逐步被混凝土的自收缩和干燥收缩所消耗,起到了补偿早期部分收缩量的作用;二层板内温度修正后微应变在30 d后较二层梁内减小约50με,薄板结构在各项约束条件下收缩更大,更易产生收缩裂缝。High performance expansive agent has the characteristics of large early expansion energy and small hydration reac-tion water requirement. Under reasonable pouring construction and maintenance measures,shrinkage-compensating concrete prepared by high performance expansive agent can significantly improve crack control effect of super-long beam-slab structure in rail transit engineering. The results show that temperature correction microstrain of second beam plate concrete in upper cover of Xukou car depot reached maximum +50~+100 με in 3 days,and decreased to-100~-20 με after 30 days. The early expansion of expansive components which consumed by autogenous shrinkage and drying shrinkage of concrete had the effect of compensation for the early partial shrinkage. The temperature correction microstrain of second plate was about 50 με lower than second beam after 30 days.The shrinkage of thin plate structure is larger under various constraints,and it is more likely to produce shrinkage cracks.

关 键 词：地铁车辆段 超长梁板结构 补偿收缩混凝土 高性能膨胀剂 微应变 

分 类 号：TU528.37[建筑科学—建筑技术科学]