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AssigneeConstruction Products Research, Inc.
InventorWarner K. Babcock
Estimating the term…
A cementitious composition which, when mixed with water, is capable of setting rapidly into a hard mass of high compressive strength without substantial shrinkage during setting, and having reduced wet and dry volume changes in the hardened state comprises aluminous cement, gypsum, a drying shrinkage inhibitor and a wet expansion inhibitor. The wet expansion inhibitor is a lithium salt which may be added in an effective amount ranging between 0.01 to 0.5 percent, by weight, based on the aluminous cement and gypsum and preferably between 0.1 and 0.3 percent. It is preferred to employ between 60 and 90 percent, by weight, aluminous cement and between 10 and 40 percent, by weight, gypsum. The hardened drying shrinkage inhibitor, preferably Portland cement, is added in an amount ranging between 0.1 and 25 percent, by weight, based on the aluminous cement and gypsum, and preferably between 1 and 20 percent.
A cementitious composition which, when mixed with water, is capable of setting into a hard mass with inhibited wet expansion in the hardened state comprising aluminous cement, gypsum, a drying shrinkage inhibitor and a salt of lithium in an amount effective to act as a wet expansion inhibitor.
A cementitious composition comprising 60 to 90 percent, by weight, aluminous cement, 10 to 40 percent, by weight, gypsum, 0.1 to 25 percent, by weight, based on the amount of aluminous cement and gypsum, Portland cement and 0.01 to 0.5 percent, by weight, based on the amount of aluminous cement and gypsum, of a salt of lithium as a wet expansion inhibitor.
In a cementitious composition which when mixed with water is capable of setting into a hard mass in a short period of time without substantial shrinkage during setting and possessing a high degree of impermeability to fluids, comprising aluminous cement, gypsum and Portland cement the improvement therein enabling inhibition of expansion of the hardened system in the wet state, comprising the addition thereto of a salt of lithium in an amount effective to inhibit hardened state wet expansion.
A method of inhibiting wet expansion in the hardened state of a cementitious system comprising aluminous cement, gypsum and a drying shrinkage inhibitor comprising admixing therewith, prior to hardening, a salt of lithium.
A hardened cementitious composition having inhibited wet expansion comprising the reaction products, when mixed with water, of aluminous cement, gypsum, Portland cement and a salt of lithium.
Dependencies are inferred from the claim text.