Masonry admixture and method of preparing same
AssigneeW. R. Grace & Co.-Conn.
InventorsCraig T. Walloch, Cynthia L. Ebner, David Chin, Bahram Siadat, Chia-Chih Ou
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Abstract
An additive is provided that comprises a single blend of an acid component and calcium stearate for simultaneously controlling both primary and secondary efflorescence in concrete, and particularly in concrete masonry units such as pavers. A preferred method comprises the steps of partially saponifying tall oil fatty acid with calcium hydroxide, and thereafter adding calcium stearate dispersion to form a stable emulsion blend. In another embodiment, potassium hydroxide is mixed with calcium stearate dispersion, then subsequently introduced into tall oil fatty acid to provide a non-emulsion TOFA/CSD blend.
Claims19
A composition for decreasing efflorescence in concrete, said composition comprising a single admixture blend operative to reduce primary and secondary efflorescence in concrete, said blend comprising a liquid water-insoluble oil selected from the group consisting of a fatty acid and a rosin acid and a dispersion comprising an aqueous suspension of solid particles of calcium stearate.
A method for formulating a single blend concrete admixture composition comprising the steps of:
- providing a liquid water-insoluble oil selected from the group consisting of fatty acid and rosin acid;
- saponifying said liquid water-insoluble oil;
- and
- combining said saponified liquid water-insoluble oil with a dispersion comprising an aqueous suspension of solid particles of calcium stearate, whereby a single blend is obtained.
A method for controlling efflorescence in concrete, comprising the steps of:
- introducing into concrete a single blend comprising a liquid water-insoluble oil and a dispersion comprising an aqueous suspension of solid particles of calcium stearate, wherein said water-insoluble oil is at least partially saponified prior to addition of calcium stearate.
An admixture blend operative to reduce primary and secondary efflorescence in concrete when added as a single admixture into the concrete mixture, comprising (1) a liquid water-insoluble oil selected from the group consisting of a fatty acid and a rosin acid and (2) a dispersion comprising an aqueous suspension of solid particles of calcium stearate;
- said blend obtained by combining said water-insoluble oil and calcium hydroxide in an amount operative to saponify 5 to 90% of said oil based on the saponification value of said oil, said water-insoluble oil and calcium hydroxide being combined with each other prior to addition of calcium stearate, and, after said step of combining said liquid water-insoluble oil with said calcium hydroxide, combining said saponified oil with a dispersion comprising an aqueous suspension of solid particles of calcium stearate, whereby a blend is obtained.
Dependencies are inferred from the claim text.