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US 12,515,991 B2Granted
Cement board with water-resistant additive
AssigneePermaBASE Building Products, LLC
InventorJames Hickey
Life of this patent
Estimating the term…
Abstract
In the present disclosure, a cement board is disclosed. The cement board comprises a core having a first surface and a second surface opposite the first surface and a binder including a pozzolan material and a water-resistant additive, wherein the water-resistant additive is present in an amount of less than 5 wt. % based on the weight of the pozzolan material.
Claims25
A cement board, comprising:
- a core having a first surface and a second surface opposite the first surface and a binder including a cement, a water-resistant additive comprising a metal salt of a fatty acid including a backbone carbon chain having from 12 to 60 carbon atoms, wherein the water-resistant additive is present in an amount of less than 5 wt. % to 0.3 wt. % or more based on the weight of the core, and a lightweight aggregate comprising expanded shale, expanded clay, expanded vermiculite, expanded perlite, expanded pumice, expanded glass, expanded polystyrene, polyurethane, hollow spheres, or a mixture thereof;
- wherein the cement board exhibits a compressive strength of from 250 psi to 4,000 psi as determined in accordance with ASTM D2394.
A cement board, comprising:
- a core having a first surface and a second surface opposite the first surface and a binder including a cement and a water-resistant additive comprising a metal salt of a fatty acid including a backbone carbon chain having from 12 to 24 carbon atoms, wherein the water-resistant additive is present in an amount of less than 2 wt. % to 0.3 wt. % or more based on the weight of the core;
- wherein the cement board exhibits a compressive strength of from 500 psi to 2,500 psi as determined in accordance with ASTM D2394.
Dependencies are inferred from the claim text.