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南京长江第四大桥北锚碇锚体属于大体积混凝土。针对锚体大体积混凝土进行了配合比设计和试验研究,通过半绝热温升试验对中热硅酸盐水泥和普通硅酸盐水泥进行对比试验,结果表明普通硅酸盐水泥掺加粉煤灰、矿渣粉和缓凝型高效减水剂可以有效降低水泥的水化热速率和延缓放热峰值,用普通硅酸盐水泥、粉煤灰和矿渣粉配制的混凝土,再采取有效的技术措施,完全能满足大体积混凝土施工的要求。
The North Anchorage of Nanjing No.4 Bridge is an integral part of mass concrete. According to the mix design and experimental study of large volume concrete of anchor body, the comparative experiment of moderate heat Portland cement and ordinary Portland cement by semi-adiabatic temperature rise test shows that ordinary Portland cement mixed with fly ash , Slag powder and retarding superplasticizer can effectively reduce the cement hydration heat rate and postponed the exothermic peak, with ordinary portland cement, fly ash and slag powder prepared concrete, and then take effective technical measures, complete To meet the requirements of mass concrete construction.