UNDERWATER CEMENTITIOUS COMPOSITION

摘要

A method for placing concrete underwater comprising pumping a flowable cementitious mixture comprising cement, water and one of either BNS or a cellulosic polymer to the underwater point of discharge of the cementitious mixture from a delivery tube and adding into the flowable cementitious mixture at the point of discharge, the other of the BNS or a cellulosic polymer resulting in a cementitious mixture having zero flow characteristics.