Tremie concrete refers to a method of placing concrete underwater or in situations where free fall of concrete is impractical or undesirable. It involves using a tremie pipe, which is a large diameter pipe, typically 8 to 12 inches in diameter (20 to 30 cm), that is designed to deliver concrete to the desired location without segregation or loss of ingredients. This method is commonly used in construction projects where foundations are built underwater, such as bridge piers, dams, and deep foundations like drilled shafts or caissons
