刘 丹1,2
刘丹.泵闸大体积混凝土开裂风险评估与温度控制[J].混凝土与水泥制品,2022(10):27-31.
LIU D.Cracking Risk Assessment and Temperature Control of Mass Concrete for Pump Gate[J].China Concrete and Cement Products,2022(10):27-31.
泵闸大体积混凝土开裂风险评估与温度控制
刘 丹1,2
刘丹.泵闸大体积混凝土开裂风险评估与温度控制[J].混凝土与水泥制品,2022(10):27-31.
LIU D.Cracking Risk Assessment and Temperature Control of Mass Concrete for Pump Gate[J].China Concrete and Cement Products,2022(10):27-31.
摘 要:基于大体积混凝土温度-应力场耦合计算方法和大体积混凝土开裂风险评估技术,针对实际工程新建泵闸项目,进行浇筑后28 d温度变化预测、温度预警评估和开裂风险评估,并及时提供温控建议。结果表明,通过综合考虑控温方式和控温时间设置,有效控制了该底板的最高温度≤70 ℃,内表温差≤25 ℃/d,入模温度≤30 ℃,降温速率≤2 ℃/d,符合JTS/T 202—1—2022《水运工程大体积混凝土温度裂缝控制技术规范》的要求,达到了良好的预测效果和裂缝控制效果。
Abstract: Based on the coupled temperature-stress field calculation method and the cracking risk assessment technology of mass concrete, the temperature change prediction, temperature early warning assessment and cracking risk assessment 28 d after pouring were carried out for a new pump gate project of the actual project, and the temperature control suggestions were provided in time. The results show that by comprehensively considering the temperature control method and temperature control time setting, the maximum temperature of the bottom plate is effectively controlled ≤70 ℃, the internal surface temperature difference is ≤25 ℃/d, the molding temperature is ≤30 ℃, and cooling rate is ≤ 2 ℃/d, which can meet the specification requirements of the JTS/T 202—1—2022 Technical Specification for Thermal Cracking Control of Mass Concrete of Port and Waterway Engineering and achieve good prediction and crack control effect.
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