What technique utilizes tremie pipe for placement?

The technique that utilizes tremie pipe for placement is primarily associated with cement grouting. A tremie pipe is a hollow pipe used to facilitate the underwater placement of concrete or grout in a controlled manner. When cement grouting is performed, the tremie pipe allows the grout to flow to specific depths, minimizing the potential for contamination and ensuring that the material is placed accurately and effectively.

In cement grouting, the tremie pipe is pushed down into the material being grouted and the grout is then pumped through the pipe. This method is particularly useful when working in conditions where the grout needs to be placed below water or in voids that are difficult to reach by traditional methods. The design of the tremie pipe ensures that the grout exits at the bottom and rises as the pipe is slowly withdrawn, helping to maintain a continuous flow and preventing segregation of the grout materials.

Other methods, while they may involve pouring or mixing, do not utilize a tremie pipe specifically for the placement of materials in the same controlled way as cement grouting does.