超高索塔结构混凝土裂缝控制关键技术研究  

Research on Key Technology for Crack Control of Super High Cable Tower Structure Concrete

作　　者：徐文[1] 张士山 李军堂[3] XU Wen;ZHANG Shi-shan;LI Jun-tang

机构地区：[1]东南大学材料科学与工程学院,南京211103 [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,南京211103 [3]中国中铁大桥局集团有限公司,武汉430050

出　　处：《混凝土与水泥制品》2019年第7期84-87,共4页China Concrete and Cement Products

基　　金：中国铁路总公司科技研究开发计划(K2018G056)

摘　　要：建立了基于“水化-温度-湿度-约束”多场耦合机制的超高索塔高强大体积强约束混凝土结构收缩开裂风险评估模型,定量分析了开裂风险影响因素;采用温度场与膨胀历程双重调控关键技术制备了绝热温升<50 ℃、28 d自生体积变形≥50 με的抗裂混凝土;提出了针对性的高强大体积混凝土裂缝控制施工方法。最终形成的集设计、材料、施工、监测于一体的成套技术可控制超高索塔高强大体积混凝土开裂风险<0.7。Based on the multi-field coupling mechanism of "hydration-temperature-humidity-constraint",the risk assessment model of shrinkage and cracking for large-capacity super-high cable towers with high strong volume and strong constraint concrete structure was established,and the influencing factors of cracking risk were analyzed quantitatively.Adopting the key technology of dual control of temperature field and expansion process,anti-cracking concrete with adiabatic temperature rise <50 °C and 28 d autogenous volume deformation ≥50 με was prepared.A targeted construction method for high strength concrete crack control was proposed.The resulting complete set of technical solutions integrating design,materials,construction and monitoring can control the cracking risk of large-capacity super-high main tower high strength bulk concrete <0.7.

关 键 词：超高索塔 高强大体积混凝土 多场耦合 开裂风险 双重调控 成套技术 

分 类 号：TU711[建筑科学—建筑技术科学]