Underwater concrete is a special type of high-performance concrete used for constructing structures in water environments, such as bridge piers, harbors, and offshore oil fields.
It is designed to resist washout, segregation, and bleeding, and requires special monitoring during all stages of construction. Underwater concrete can avoid isolating the water and minimize interruption to plant operation, resulting in high savings. When concrete is poured underwater, it forms an outer coating that prevents water from seeping in or diluting the cement and sets to its final hardness 28 days later.