泵站高性能混凝土试验研究

探讨了粉煤灰、高效减水剂及引气剂掺量对混凝土性能的影响，为南水北调东线工程泵站混凝土提供施工配合比。通过掺入粉煤灰、高效减水剂及引气剂，配制了不同强度等级的高性能混凝土，研究了C20、C25、C30 3种不同强度等级混凝土力学性能、耐久性能及体积稳定性，并用SEM法表征混凝土界面过渡区。研究表明，掺入粉煤灰、高效减水剂及引气剂后，混凝土立方体抗压强度均达到设计指标；在较高水胶比条件下，混凝土抗压、抗拉强度及抗压、抗拉弹性模量，和混凝土抗渗性能均随着粉煤灰掺量增加而略有提高。粉煤灰、高效减水剂及引气剂掺量分别不超过胶凝材料用量的30%、1%及0.015%时，所配制的C20、C25、C30混凝土满足泵站混凝土高性能化的要求

Research on high performance concrete of pump station

Abstract: This study focused on the properties of concrete which contained different dosage of fly ash、superplasticizer and air-entraining agent in order to provide a concrete mix for pump station of the East Route in South-North Water Diversion Project. Fly ash、superplasticizer and air-entraining agent were used to make different strength concrete. Mechanical properties, durability and stability of C20, C25, C30 3 kinds of different strength grade concrete were studied,and SEM was used to characterize the interfacial transition zone of concrete. Research shows that, after mixing fly ash, high-effective water-reducing agent and air-entraining agent, the compressive strength of concrete reaches the designed index; At higher water-binder ratio, with increasing of fly ash content, compressive strength, tensile strength and compressive, tensile elastic modulus of concrete,and the impermeability of concrete increased slightly. When dosage of Fly ash, superplasticizer and air-entraining agent did not