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简要论述了高性能混凝土对原材料及配合比设计的基本要求。针对湛江海湾大桥47#墩主塔结构工程特点、施工现状和所处环境特点,讨论了其对混凝土新拌阶段性能、凝结时间、硬化后性能的设计要求。通过系列试验对比了采用2种萘系减水剂和1种聚羧酸系减水剂所配制混凝土的各项性能,认为聚羧酸系减水剂由于减水率高、控制坍落度损失能力强、对凝结时间影响较小,所配制混凝土早期强度发展迅速、抗Cl-渗透性好等优点,完全满足工程设计要求。解释了聚羧酸系减水剂在流动性保持方面优于萘系减水剂的机理。实际施工表明,聚羧酸系减水剂用于该大桥主塔高性能混凝土不仅具有良好的技术效益,而且经济效益亦十分明显。
This paper briefly discusses the basic requirements of high performance concrete for raw material and mix design. According to the engineering characteristics, construction status and environmental characteristics of the main tower of Pier # 47 of Zhanjiang Bay Bridge, the design requirements of performance, setting time and hardened performance of the concrete in fresh phase are discussed. Through a series of experiments comparing the performance of two types of naphthalene superplasticizer and a polycarboxylate superplasticizer prepared concrete performance, that the polycarboxylate superplasticizer because of the high water reduction, slump control loss Strong ability, less impact on the setting time, the rapid development of the early strength of the prepared concrete, anti-Cl-permeability and so on, fully meet the engineering design requirements. The mechanism of polycarboxylate superplasticizer superior to naphthalene superplasticizer in fluidity maintenance is explained. The actual construction shows that the polycarboxylate superplasticizer used in the pylon of high performance concrete pylon not only has good technical efficiency, but also very obvious economic benefits.