超高索塔结构混凝土裂缝控制关键技术研究

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。

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

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.