大体积混凝土配合比优化设计及施工工艺研究

对甬江特大桥承台大体积混凝土配合比及施工工艺进行了研究,为克服大体积混凝土因水化热产生开裂,工程采用控制水泥用量、掺加粉煤灰和矿渣及高效减水剂、延长混凝土设计龄期等方法,运用密实骨架堆积理论对混凝土配合比进行优化设计,通过预埋冷却水管降温措施及严格的施工管理,有效减小混凝土温度差,减少混凝土温度裂缝的产生.

Study on Mix Proposition Optimization Design and Construction Technology of Massive Cement Concrete

To prevent the massive concrete crack caused by the cement hydration heat,the paper studies the mix proposition and construction technology of the Yongjiang bridge in Ningbo.Through making use of the methods such as controlling amount of cement,high volume coal-ash and slag,low-dosage and set-retarding high-performance superplasticizer,prolonging concrete design age,and using Denseness-skeleton weight method,the mix proposition design is optimited.The temperature difference of concrete.and concrete temperat...