Concrete
First Claim
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1. 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 m2 /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/mm2.
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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.
58 Citations
7 Claims
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1. A method for producing aerated concrete comprising the steps of:
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(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 m2 /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/mm2. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification