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US 5,948,157 AGranted
Surface treated additive for portland cement concrete
AssigneeFording Coal Limited
InventorsColin J. McKenney, Mikhail Pildysh, Donald J. Shyluk
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AssigneeFording Coal Limited
InventorsColin J. McKenney, Mikhail Pildysh, Donald J. Shyluk
Estimating the term…
The invention is directed at an additive for incorporation into a cementitious compound comprising Portland cement and water prior to the setting of the compound. The additive is comprised of a surface treated additive wherein the surfaces of the additive are treated with a substance which has a transient hydrophobic effect on the additive, which effect temporarily renders the additive more hydrophobic for a time period following the incorporation of the additive into the compound such that the water comprising the compound is less attracted to the additive during the placement of the compound and is thus available to provide workability to the compound, and such that the additive regains its natural properties following placement of the compound in order to permit the additive to participate with the compound during the curing of the compound. The invention is also directed at a process for preparing the additive and a process for preparing a cementitious compound comprised of the additive.
A process for improving the flexural strength of a cementitious composition comprising Portland cement and water by incorporating therein prior to the setting of the cementitious composition a sufficient amount of an additive consisting essentially of wollastonite that has been surface treated with at least one polymeric surfactant containing a hydrophobic component comprising propylene oxide units and a hydrophilic component positioned at one or more ends of the polymer to thereby improve the flexural strength of the cementitious composition.
A cementitious composition with improved flexural strength comprising the reaction product of Portland cement, water and a sufficient amount of an additive consisting essentially of wollastonite that has been surface treated with at least one polymeric surfactant containing a hydrophobic component comprising propylene oxide units and a hydrophilic component positioned at one or more ends of the polymer to thereby improve the flexural strength of the cementitious composition.
Dependencies are inferred from the claim text.