常泰长江大桥桥塔C60大体积混凝土配合比设计及防裂技术  

C60 Mass Concrete Mix Proportion Design and Crack Prevention Technology for Pylon of Changtai Yangtze River Bridge

作　　者：阳俊 张思 秦明强 YANG Jun;ZHANG Si;QIN Ming-qiang(CCCC Wuhan Harbour Engineering Design&Research Institute Co,Ltd,Wuhan 430040,China;Hubei Key Laboratory of Advanced Materials&Reinforcement Technology Research for Marine Environment Structures,Wuhan 430040,China)

机构地区：[1]中交武汉港湾工程设计研究院有限公司,武汉430040 [2]海工结构新材料及维护加固技术湖北省重点实验室,武汉430040

出　　处：《建材世界》2023年第5期40-43,52,共5页The World of Building Materials

摘　　要：常泰长江大桥桥塔为C60混凝土,要求一泵到顶,施工难度大,开裂风险高。论文从混凝土配合比设计及优化、大体积混凝土温控防裂两方面展开研究。通过调整胶凝材料组成、辅加抗裂剂及降黏掺合料对混凝土配合比优化设计,以满足桥塔混凝土施工性能、力学性能、热学性能、耐久性能要求。同时通过有限元仿真计算对主塔混凝土的开裂风险进行了分析,并提出了温控标准,开展模型试验验证,为主塔大体积混凝土结构的施工提供技术保障。The bridge towers of the Changtai Yangtze River Bridge were constructed using C60 concrete.The requirement was to pump the concrete all the way to the top,which posed great construction difficulties and a high risk of cracking.Research was conducted in two aspects:concrete mix design and optimization,and thermal control and crack prevention for large-volume concrete.The optimization of the concrete mix design involved adjusting the composition of cementitious materials,incorporating crack-resistant agents and viscosity-reducing admixtures.This was done to meet the requirements for construction performance,mechanical performance,thermal performance,and durability of the concrete used in the bridge towers.Additionally,finite element simulation was used to analyze the risk of cracking in the main tower's concrete.Temperature control standards were proposed,and model tests were conducted to verify the effectiveness.These efforts provided technical assurance for the construction of the main tower's large-volume concrete structure.

关 键 词：大体积混凝土控裂 功能改性材料 泵送性 高强混凝土 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]