摘要
以控制太湖湖底现浇隧道主体结构大体积混凝土无贯穿收缩性裂缝为目标,基于多场耦合机制抗裂性评估提出了混凝土裂缝控制成套技术。通过掺加具有温升抑制与微膨胀功能的抗裂剂实现混凝土温升和收缩性能的双重调控,采取新型张贴式混凝土保温保湿养护材料实现温降阶段混凝土中心平均温降速率不超过2.0℃/d,内外温差不超过15℃。首件主体结构大体积侧墙自2018年11月浇筑,至今变形监测曲线未出现跳点,实体结构未发现裂缝,裂缝控制效果良好。
In order to avoid penetrating shrinkage crack of massive concrete for main structure of cast-in-situ tunnel under Taihu Lake,a completed crack control scheme was proposed based on multi-field coupling crack resistance evaluation.Temperature rise and shrinkage deformation of tunnel concrete was double regulated by using a temperature rise inhibited and slight expansion admixture,both the average temperature drop rate of central concrete and temperature difference between inside and outside were remarkably reduced by using a novel self-adhesiveheat and moisture insulating material,which was no more than 2.0℃/d and 15℃during temperature drop stage.The first massive sidewall was casted in November 2018,no sudden change was observed in deformation monitor curve and no crack was observed in entity structure till now,which means cracking control of cast-in-situ tunnel concrete achieved a good result.
作者
高德风
周欣
费晓春
李明
徐文
GAO Defeng;ZHOU Xin;FEI Xiaochun;LI Ming;XU Wen(Jiangsu Transportation Engineering Construction Bureau,Nanjing 210004,China;The Second Engineering Co.Ltd.of CTCE Group,Suzhou 215131,China;State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Research Institute of Building Science Co.Ltd.,Nanjing 210008,China;Jiangsu Sobute New Materials Co.Ltd.,Nanjing 211103,China)
出处
《新型建筑材料》
北大核心
2020年第3期4-8,32,共6页
New Building Materials
基金
国家重点研发计划项目(2017YFB0310100)
江苏省交通工程建设局科技项目。
关键词
现浇隧道
裂缝控制
抗裂性评估
大体积混凝土
cast-in-situ tunnel
crack control
crack resistance evaluation
massive concrete
