Low density accelerant and strength enhancing additive for cementitious products and methods of using same
AssigneeJames Hardie International Finance B.V.
InventorChongjun Jiang
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Abstract
Disclosed are concrete and fiber cement formulations and products comprising low-density calcium silicate hydrate, and methods for producing these formulations and products. The disclosed formulations exhibit accelerated curing times. Other advantages of the disclosed formulations include improved dimensional stability in extruded products, reduced cracking, and reduced wash-out in underwater applications. The products of the disclosed formulation have lower cost of production and faster time to market.
Claims85
A method of forming a cementitious material, comprising:
- preparing a formulation comprising a cementitious binder and aggregate;
- adding to the formulation a quantity of low density calcium silicate hydrate sufficient to reduce the curing time of the formulation as compared to an equivalent formulation without calcium silicate hydrate, wherein the low bulk density calcium silicate hydrate is added as a powder and comprises from about 0.5% to about 50% by weight of the formulation;
- and
- curing the formulation for a time sufficient to cause the material to set;
- wherein the formulation sets in a period of time that is at least 10% less than the time it would take an equivalent formulation without calcium silicate hydrate to set, and
- wherein the bulk density of the low bulk density calcium silicate hydrate is between about 0.015 g/cm3 and about 1.5 g/cm3.
In a method for accelerating the curing of an extruded cementitious article, the improvement comprising adding a quantity of low bulk density calcium silicate hydrate to a formulation used to produce the article sufficient to accelerate the curing of the cementitious article as compared to an equivalent formulation made without low bulk density calcium silicate hydrate, wherein the bulk density of the low bulk density calcium silicate hydrate is between about 0.015 g/cm3 and about 1.5 g/cm3, and wherein the low bulk density calcium silicate hydrate is added as a powder and comprises from about 0.5% to about 50% by weight of the formulation.
In a method for accelerating the curing of a cementitious article cured underwater, the improvement comprising adding a quantity of low bulk density calcium silicate hydrate to a formulation used to produce the article sufficient to accelerate the curing of the cementitious article compared to an equivalent formulation made without low bulk density calcium silicate hydrate, wherein the bulk density of the low bulk density calcium silicate hydrate is between about 0.015 g/cm3 and about 1.5 g/cm3, and wherein the low bulk density calcium silicate hydrate is ddded as a powder and comprises from about 0.5% to about 50% by weight of the formulation.
Dependencies are inferred from the claim text.