Liquid concrete accelerating mixtures and methods for use thereo

Details Liquid concrete accelerating mixtures and methods for use thereo Liquid concrete accelerating mixtures and methods for use thereo

1976-04-29

1977-09-06

Poer, J.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 97, 106315, C04B 735

Patent

active

040465845

ABSTRACT:
There is disclosed a liquid accelerating additive for wet concrete which has a long shelf stability and which is ideally suited for use in shotcreting applications. The accelerating additive is a composition of sodium and potassium aluminates having the proportions of from 15 to about 40 weight percent alumina, and from 10 to about 25 weight percent of each of sodium and potassium, expressed as the oxides. The balance of the additive is water.
The invention also includes a method of shotcreting in which wet concrete is sprayed against the surface of a structure, typically the wall and/or ceiling of a subterranean tunnel or cavern while incorporating in the wet concrete mixture a sufficient quantity of the liquid accelerating additive to control the setting of the concrete coating. The liquid accelerating additive can be incorporated into the concrete mixture by blending it into the water ingredient of the concrete which is admixed with a premixed, dry, solid component that includes the cement and aggregate or, if desired, can be blended into the wet concrete as the concrete is sprayed onto the surface.

REFERENCES:
patent: 2793128 (1957-05-01), Emhiser
patent: 3140956 (1964-07-01), Kamlet et al.
patent: 3433657 (1969-03-01), Pickering
patent: 3656985 (1972-04-01), Bonnel et al.
patent: 3782991 (1974-01-01), Burge
patent: 3850651 (1974-11-01), Duncan et al.

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