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US 5,622,556 AGranted
Lightweight, low water content 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 that can incorporate fly ash, portland cement, sand, 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 very low water contents, in the range of from about 0.5% to 5% v/v. The ultra low water compositions can be extruded and can be molded under high pressure.
Claims35
A load bearing cementitious product comprising:
- (a) from 40 to 99% by volume of an aqueous cementitious mixture;
- (b) from 1 to 60% by volume of micronized polystyrene foam particles;
- and
- (c) a borate insect repellent;
- said cementitious product having an overall water content of from 0.005% to 10% by volume.
2 more elements
A method of preparing a lightweight cementitious product comprising the steps of:
- (a) shredding polystyrene containing a borate insect repellant;
- and having an approximate 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;
- (c) dispersing said foam particles into said cementitious mixture;
- (d) adding a sufficient quantity of water to result in a product having a volume of water present of from 0.005% to 5%;
- (e) compressing the product of step (d) under high pressure of from 500 to 5,000 lb/in.sup.2.
3 more elements
Dependencies are inferred from the claim text.