Admixture for cement
AssigneeDipsol Chemicals Co., Ltd.
InventorsMasaru Kawai, Shuji Igarashi
Life of this patent
Estimating the term…
Abstract
An admixture for cement comprises phosphorous acid and/or a salt thereof or a waste fluid originated from an electroless nickel-plating process which contains phosphorous acid and/or a salt thereof. The admixture is used as a setting accelerator, a rust proofing agent for reinforcing steel or a frost resistive agent for concrete and mortar as hydraulic cement blends. The admixture not only permits improvement of the resulting concrete in the setting-accelerating effect, but also can maintain the compressive strength at a high level while maintaining the bleeding rate at a low level.
Claims8
A cement admixture consisting essentially of a waste fluid originated from an electroless nickel-plating process said waste fluid comprising an aqueous solution containing about 50 to 450 g/l of sodium phosphite.
A method for preparing concrete or mortar comprising the step of adding a cement admixture consisting essentially of a waste fluid originated from an electroless nickel-plating process said waste fluid comprising an aqueous solution containing about 50 to 450 g/l of sodium phosphite, to cement in an amount of not less than 3 parts by weight, as expressed in terms of the amount of sodium phosphite per 100 parts by weight of the cement.
Dependencies are inferred from the claim text.