What is the process called for pouring concrete underwater?

The process of pouring concrete underwater is known as the Tremie method. This technique is specifically designed to effectively place concrete in conditions where it is submerged, such as underwater foundations or submerged structures.

The Tremie method involves using a rigid pipe, called a tremie, which allows the concrete to flow from a hopper into the desired location beneath the water. By maintaining a controlled flow, the concrete is poured in a manner that minimizes the mixing of the water with the concrete, ensuring a proper bond and integrity of the mix. This method is particularly advantageous because it helps to prevent washout of the cement particles that could occur if concrete were poured directly into flowing water.

This process is essential in construction scenarios that require underwater applications and is standard practice for various marine and civil engineering projects.