Water Resources and Power

Recently,the phenomenon that the quality problems of aggregate make seriously impact or significant loss to the hydropower project construction occurs frequently.The Maluling artificial aggregate field,as jury stocking yard of concrete aggregate of the Datengxia Hydro-junction,was selected as an emphasis research by field surveys and comprehensive comparison.The material layers of the stocking yard mainly compose of quartz sandstone and sandstone intercalated with argillaceous siltstone.In spite of the rich reserves,the less stripping volume and the convenient transportation,the alkali activity of quartz sandstone and sandstone and the soft interlayer will influence the concrete strength.Therefore,the quality of the artificial aggregate field is the key to establish stocking yard.Based on the geological investigation and experimental research data,the quality evaluation of the stocking yard has been comprehensively demonstrated from macroscopic analysis and experimental research.The result indicated that the quartz sandstone and sandstone is the active aggregate which is belong to the potential harmfulness alkali silica-reaction type and the potential alkali silica-reaction will effectively inhibited by adding 10%~20%fly ash;the aggregate mixing not greater than 5% of the argillaceous siltstone interlayer has little impact on the concrete strength and the concrete strength can meet the design requirements.Thus,it provides scientific basis for selecting this stock ground as the reserve source of concrete aggregate.