Method for retarding efflorescence in building materials and building material that exhibits reduced efflorescence
First Claim
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1. A method for retarding efflorescence of a building material, comprising the step of applying a coating composition comprising polyvinylalcohol (PVOH) onto a surface of a building material subject to efflorescence, said PVOH having a hydrolysis percent of at least about 90%.
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Abstract
Efflorescence of building material, such as portland cement based building products, masonry, brick, concrete, and mortar, can be retarded by contacting the building material with polyvinylalcohol (PVOH). The PVOH may be dissolved in solvent, preferably water, and either applied to a surface of the building material, or added to the components that form the building material. The PVOH has a hydrolysis percentage above about 90%.
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16 Claims
- 1. A method for retarding efflorescence of a building material, comprising the step of applying a coating composition comprising polyvinylalcohol (PVOH) onto a surface of a building material subject to efflorescence, said PVOH having a hydrolysis percent of at least about 90%.
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6. The method of claim I wherein said hydrolysis percent is about 95% to about 99.9%.
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16. An article of manufacture comprising a building material coated with polyvinylalcohol (PVOH), said building material containing salts which can effloresce, said PVOH having a hydrolysis percent of at least about 90% and being present in said composition at an amount effective to retard efflorescence of the building material.
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