Underwater cementitious composition

Details Underwater cementitious composition Underwater cementitious composition

C - Chemistry, Metallurgy

04

B

C04B 40/00 (2006.01) C04B 24/22 (2006.01) C04B 24/38 (2006.01) C04B 28/02 (2006.01)

Patent

CA 2206595

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.

On décrit un procédé de mise en place de béton sous l'eau, consistant à pomper, à partir d'un tuyau d'alimentation, un mélange cimentaire fluide comprenant du ciment, de l'eau ainsi que soit un condensat de beta -naphtalèneformaldéhydesulfonate, soit un polymère cellulosique, afin de décharger ce mélange au niveau d'un point situé sous l'eau, et à ajouter dans le mélange cimentaire fluide, au niveau du point de décharge, soit le condensat de beta -naphtalène formaldéhyde sulfonate, soit le polymère cellulosique, afin d'obtenir un mélange cimentaire présentant des caractéristiques d'écoulement nul.

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