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US 4,383,862 AGranted
Concrete
AssigneeDomocon S.A.
InventorJohn M. Dyson
Life of this patent
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Abstract
A method of producing aerated concrete, that is, concrete in which a gas is entrained, comprises forming a mortar mix, which includes all the components of the concrete except for the gas. The mix is then pumped at a predetermined rate, to blending means. Gas is fed under pressure to blending means via control valves. The blending of the mix with the gas takes place in a substantially closed chamber.
Claims7
A method for producing aerated concrete comprising the steps of:
- (a) producing a mortar mix of water, sand, cement, a foaming agent and a silicate, said silicate being an active, colloidal silicate of magnesium, calcium, barium and/or aluminium prepared by precipitation from waterglass with a salt of the appropriate metal, and having a specific surface area in excess of 15 m.sup.2 /gm as measured by the BET method and which is in the form of a hydrogel or a xerogel;
- (b) pumping said mortar mix at a predetermined rate to a substantially closed chamber located within blending means;
- (c) feeding gas via gas pressure regulation means to said chamber, thereby obtaining in said blending means mortar mix and gas in predetermined proportions;
- and
- (d) blending said mortar mix and gas within said chamber by the action of a rotary mixer located within the chamber to produce aerated concrete mix which, when set, has a compressive strength of from 15 to 35 N/mm.sup.2.
2 more elements
Dependencies are inferred from the claim text.