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US 5,725,652 AGranted
Lightweight, low water content expanded shale, clay and slate cementitious compositions and methods of their production and use
OwnerDavid M. Shulmaninventor
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Abstract
An improved lightweight cementitious product made up of an aqueous cementious mixture using cement and expanded shale, clay and slate mix, that can incorporate fly ash, lime, and the weight saving component, which is micronized polystyrene particles having particle sizes in the range of 50 to 2000 microns, and characterized by having water contents in the range of from about 0.5% to 50% v/v. The ultra low water compositions can be extruded and can be molded under high pressure.
Claims40
A load bearing cementitious product comprising:
- (a) from 40 to 99% by volume of an aqueous cementitious mixture comprising cement, expanded shale, clay and slate;
- and
- (b) from 1 to 60% by volume of micronized polystyrene foam particles;
- said cementitious product having an overall water content of from 0.005% to 20% by volume.
1 more element
A method of preparing a lightweight cementitious product comprising the steps of:
- (a) shredding polystyrene having a minimum density of 1 lb/ft.sup.3 to form micronized polystyrene foam particles;
- (b) forming a cementitious mixture suitable for undergoing a hydration reaction in the presence of water, said mixture consisting of cement, expanded shale, clay and slate;
- (c) dispersing said foam particles into said cementitious mixture;
- and
- (d) adding a sufficient quantity of water to bring the volume of water present to from 0.005% to 5%.
2 more elements
Dependencies are inferred from the claim text.