Underwater concreting cement composition

Details Underwater concreting cement composition Underwater concreting cement composition

C - Chemistry, Metallurgy

04

B

261/53

C04B 24/38 (2006.01) C04B 28/02 (2006.01)

Patent

CA 1208243

Abstract of the Disclosure: An underwater concreting cement composition comprising a base prepared by adding (a) 0.2 to 2.0 parts by weight of hydroxyethylcellulose and (b) 0.01 to 0.2 part by weight of high-molecular weight polyethylene oxide and/or 0.2 to 4.0 parts by weight of calcium formate. The hydroxyethyl- cellulose preferably has the molar number of ethylene oxide substituted per glucose unit of 1.5 to 4.0 and a viscosity at 25°C in a 1% aqueous solution of 1,000 to 7,000 cP. The high-molecular weight polyethylene oxide preferably has an average molecular weight of 60,000 to 6,000,000. Calcium formate is added to accelerate the setting. This underwater concreting cement composition can be directly placed under water or in a watery place. Moreover, this composition is free from bleeding and can be pumped.

444800

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