The roll compaction lean cement aggregate needs only a small amount of cementation material and has certain erosion resistance.Meanwhile it has main advantages of concrete face rockfill dam and RCC dam.In the construction of roll compaction lean-cement aggregate for the main cofferdam of Hongkou Hydropower Station

those unscreened natural materials and excavated dregs materials were adopted

with the maximum grain size of 250mm.After being mixed

they were rolled by 12T dual-wheel vibratory roller or 26T steel wheel vibratory roller.In June 6

2006

the flood level was 8 m higher above the dam crest

1.5m higher than the design water head of dam crest

and the main cofferdam experienced the test.