塑性混凝土弹模低、变形大,其能较好地适应地基沉降,因而在水利水电工程防渗墙施工中得到了广泛应用。在陆丰核电厂围堰防渗工程中,为了充分利用现场资源,降低工程成本,拟采用石渣粉代替部分或全部石子和河沙进行塑性混凝土防渗墙配合比设计。通过塑性混凝土性能试验对各项技术指标进行了测定,并通过注水试验和孔内摄像对配合比方案的现场防渗效果进行了检测。结果表明,在砂率保持不变的情况下,随着膨润土掺量的增加,塑性混凝土防渗墙的抗渗性能大幅提高,强度只存在小幅度降低,满足工程对塑性混凝土各项性能指标的要求,且塑性混凝土防渗墙成墙质量完好。这验证了石渣粉作为骨料的配合比方案的可行性。

Plastic concrete could well adapt to foundation settlement due to its low elastic modulus and large deformation. As a result, it is widely used in the construction of cutoff wall in hydropower projects. As to the anti-seepage project of cofferdam in Lufeng nuclear power plant, in order to make full use of resources on site and reduce the cost of project, we adopted stone ballast to take the place of pebble and sand for mix proportion design of plastic concrete. Then we determined the technical indexes of plastic concrete by performance test, and detected the anti-seepage effect of the mix proportions through water injection test and hole imagery. Results show that when the sand ratio remains unchanged, the impermeability improves greatly with bentonite content increases, while the strength decreases little, which meets the requirements for performance index. The cutoff wall is also in good condition. The mix proportion with stone ballast replacing pebble and sand is verified to be feasible.