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US 5,667,340 AGranted
Cementitious composition for underwater use and a method for placing the composition underwater
AssigneeSandoz Ltd.
InventorJeffrey Bury
Life of this patent
Estimating the term…
Abstract
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.
Claims9
A method of placing concrete underwater comprising the steps of
- pumping through a delivery tube a flowing cementitious composition comprising cement and one of either a cellulosic polymer or a .beta.-naphthalene sulfonate formaldehyde condensate to the end of the tube at the point of discharge,
- introducing into the cementitious composition at the point of discharge the other of said cellulosic polymer or .beta.-naphthalene sulfonate formaldehyde condensate, and, discharging the cementitious composition from the delivery tube at an underwater location,
- said cellulosic polymer and .beta.-naphthalene sulfonate formaldehyde condensate being used in a weight ratio of 1:0.5 to 1:10, respectively.
Dependencies are inferred from the claim text.