沐若水电站大坝碾压混凝土石粉掺和料应用研究

Research on application of the admixture of stone powder in RCC dam of Muruo Hydropower Station

沐若水电站大坝为全断面碾压混凝土重力坝,因当地人工砂的细度模数小,石粉含量高,为降低工程造价,合理利用资源,减少对环境的污染,对石粉作为掺和料进行了一系列现场试验研究。结果表明,只要采用合适的加工工艺控制人工砂的石粉含量在27%以下,以内含的方式按砂质量3%～4%的石粉作为掺和料配制碾压混凝土,就完全可以满足设计对碾压混凝土各项性能指标的要求。此项成果已成功应用于工程实际,取得了较好的效果。

The dam of Muruo Hydropower Station is a full section RCC gravity dam,the local artificial aggregate consists of sand with small fineness modulus and the high content of stone powder.A series of field tests on the admixture of stone powder are conducted in order to use the resources rationally and reduce engineering cost and environmental pollution.The results show that the powder content in artificial sand accounts for 27% at most by adopting appropriate processing technology,the RCC is prepared by using the stone powder accounts for 3%~4% sand content to form a admixture,both of which can fully meet the design requirements of each indicator of RCC.The result has been successfully applied to actual projects and obtained good effects.