Additive combination for hydraulic cement compositions
First Claim
1. An improved additive for hydraulic cement compositions which additive is readily dispersible in water and comprises an oil-in-water emulsion in which the solids portion is comprised of a major proportion of a water-insoluble, water-repelling acid component to impart water-repelling properties to said cement, from about 3 to about 30 percent by weight of a set-retarding component for said cement, emulsifier, and a stabilizing component comprising a low molecular weight non-ionic, water soluble organic compound, the amount of said stabilizing component being at least sufficient to maintain said emulsion stable when exposed to low temperature.
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Accused Products
Abstract
The low temperature stability of an additive product for imparting desirable properties such as water repellency, set-retardation, etc., to hydraulic cement compositions and Portland masonry cements in particular, is improved by the addition of a small amount of certain low molecular weight, water soluble, non-ionic organic materials (e.g. alcohols, ketones, amides, and aldehydes) to the additive product. The use of low-temperature stabilizers within this class which also act as grinding aids for hydraulic cements (e.g. glycols) is highly preferred, since the use of such materials as the stabilizing ingredient has been found to additionally impart grinding aid properties to the additive product even at the relatively low usage rates of the stabilizing component. This additional property of the resulting product is a very desirable advantage to the user of the product since the product is customarily added to the cement during the grinding operation.
35 Citations
17 Claims
- 1. An improved additive for hydraulic cement compositions which additive is readily dispersible in water and comprises an oil-in-water emulsion in which the solids portion is comprised of a major proportion of a water-insoluble, water-repelling acid component to impart water-repelling properties to said cement, from about 3 to about 30 percent by weight of a set-retarding component for said cement, emulsifier, and a stabilizing component comprising a low molecular weight non-ionic, water soluble organic compound, the amount of said stabilizing component being at least sufficient to maintain said emulsion stable when exposed to low temperature.
- 4. An improved additive for Portland masonry cement compositions, which additive is readily dispersible in water and comprises an oil-in-water emulsion containing water and a solids portion comprised of a major proportion of a water-insoluble, water-repelling acid component selected from the group consisting of fatty acids, rosin acids and mixtures thereof, from about 3 to about 30 percent by weight of solids of a water-soluble, set-retarding component for said cement, at least about 0.5 percent by weight of an emulsifier formed by reacting said acid component with a base capable of forming a salt thereof, and a stabilizing component comprising a low-molecular weight, non-ionic, water soluble organic compound selected from the group consisting of alcohols, ketones, aldehydes, amides, and mixtures of such, the amount of said stabilizing component being at least sufficient to maintain said emulsion stable when exposed to low temperature.
- 9. An improved additive for Portland masonry cement compositions, which additive is readily dispersible in water and comprises an oil-in-water emulsion containing water and a solids portion containing a major proportion of tall oil acid, from about 3 to about 35 percent by weight of a retarder of the setting time of said cement, at least about 0.5 percent by weight of a salt of said acid as an emulsifier, from 1 to about 5 percent by weight of an air-entraining agent for said cement, and from about 3 to about 25 percent by weight of said emulsion of a polyhydric alcohol, said alcohol acting to stabilize said emulsion when said emulsion is exposed to low temperature and also to improve the efficiency of the grinding operation when said additive is added to said cement during grinding thereof.
Specification