夏特水电站水工混凝土抗硫酸盐侵蚀耐久性试验研究

Test study on durability of hydraulic concrete against sulfate corrosion in Xiate Hydropower Station

硫酸盐侵蚀是影响地下工程混凝土耐久性的一个重要因素.是对混凝土危害性最大的一种环境腐蚀效应.结合新疆克州夏特水电站地下水硫酸根离子超标,具有强腐蚀性的特点,以当地水泥厂生产的水泥和本地骨料为基础,通过采用普通水泥掺入一定比例的粉煤灰、比选外加剂、严格控制水灰比等工艺措施,按工程设计要求配制混凝土试件,应用混凝土抗硫酸盐侵蚀的试验方法,设计单位开展了普通硅酸盐水泥代替抗硫酸盐水泥的混凝土抗硫酸盐侵蚀耐久性试验研究.研究结果表明:通过调整胶凝材料和混凝土配合比等措施,普通水泥配制的混凝土能满足设计抗硫酸盐性能的要求,根据施工预算分析,有望较大幅度节约工程建设投资.

Sulfate corrosion is an important factor affecting the durability of hydraulic concrete in underground works,which is also the most harmful environmental corrosion effect to hydraulic concrete.The content of sulfate ions in the groundwater of Xiate Hydropower Station in Kezhou,Xinjiang,exceeds the standard,and the groundwater is highly corrosive.The cement produced in local cement plant and the local aggregates were used as raw materials to prepare the concrete samples according to the engineering design requirements by mixture of a certain proportion of fly ash into the ordinary cement,selection of admixtures,strict control of water-cement ratio,and other technological measures.The design organization used the method of concrete resistance to sulfate erosion to test the durability of concrete resistance to sulfate erosion by replacing the ordinary Portland cement with the sulfate resistance cement.The research results showed that the concrete prepared by ordinary cement could meet the requirement of designed sulfate resistance by adjusting the proportion of cementitious material and concrete.According to the analysis of construction budget,it is expected to save the construction investment.