Experimental study on the concrete properties in cut-off wall of the earth-rock cofferdam

Combined with a cofferdam cut-off wall engineering,concrete mix proportions and properties were studied.The test results have shown that the water-binder ratio below 0.8,sand percentage over 60%,cement content more than 170 kg/m3 with the addition of bentonite,fly ash,high performance air entraining and water reducer can confect the cut off wall concrete with relative low compressive strength,low elastic modulus,high impermeability and high fluidity,which can meet the specific engineering requirements.