塑性混凝土配合比性能研究及其在土石坝防渗墙工程中的应用

通过塑性混凝土配合比与性能的试验研究得到的结果表明，采用最优砂率配制的塑性混凝土其变形性能好（大应变）并呈塑性破坏、弹性模量对砂率变化的敏感度小、用水量较小l塑性混凝土抗压强度与弹性模量随膨润土用量的增加而减小，引气剂的掺人有利于改善塑性混凝土的性能．选择合适的塑性混凝土配合比，将其用于土石坝防渗墙工程，无论是施工性能还是墙体性能均符合工程设计要求．

The mix proportion of plastic concrete and its characteristics and application to cut-off wall of embankment dam

The mix proportion of plastic concrete and its characteristics and application to cut-off wall of embankment dam were investigated and the results showed that plastic concrete required an optimal proportion of sand in order to meet the demand for project design. This plastic concrete was characterized by a large strain with plastic failure,less sensitivity of elastic modulus to varying sand proportion and small amount of water addition. The com- pressive strength and elastic modulus of plastic concrete decreased with the increase of Bentonite amount. Air-entraining agent obviously resulted in improving characteristics of plastic concrete. The practical application of plastic concrete with optimal mix proportion to the cutoff wall project of an embankment dam proved that this plastic concrete can meet the project requirement and achieved the desired results.