Gradation analysis and adjustment test of coarse aggregate for Xiluodu Hydropower Stations

The aggregate supplied for coarse aggregate production system of Xiluodu Hydropower Station is unbalanced in gradation;oversize aggregate is not enough while the small aggregate is too much,resulting in aggregate abandonment.The coarse aggregate proportion of 4-graded concrete was optimized through laboratory test and in-situ investigation,and the proportion was determined as 23:30:22:25.The workability is better after adjustment.The coarse aggregate production and construction demand is balanced basically,and no more aggregate abandonment happened.