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在分析大体积混凝土温度裂缝产生机理的基础上,以西江特大桥主墩承台为背景,通过采用低水化热胶凝材料体系、高效缓凝型减水剂及级配良好的碎石优化混凝土配合比,采用降低混凝土入模温度、埋设冷却水管及蓄水保温养护等温控措施,进行承台大体积混凝土施工,并对浇注后承台混凝土温度进行监控,有效避免了有害温度裂缝的产生。
Based on the analysis of the mechanism of temperature cracks in mass concrete, taking the main pier cap of Xijiang River Bridge as the background, through the use of low hydration heat cementitious material system, high effective retarding superplasticizer and graded graded optimization Concrete mix ratio, the use of reducing the temperature of concrete into the mold, buried cooling water pipes and water temperature preservation and other temperature control measures for large-scale concrete platform pile cap construction, and after pouring concrete temperature monitoring platform to effectively prevent the occurrence of harmful temperature cracks .