Method of preventing the deterioration of a hardened cement-base

Details Method of preventing the deterioration of a hardened cement-base Method of preventing the deterioration of a hardened cement-base

1990-05-15

1991-06-04

Lusigman, Michael

Coating processes

Restoring or repairing

427387, 4273936, 427403, 4274071, B05D 302, B05D 510, B05D 136, E01C 512

Patent

active

050212605

ABSTRACT:
A hardened cement-based mass having a corrosive metallic material embedded therein, or containing an aggregate reactive with an alkaline substance, is impregnated with an aqueous solution containing 1 to 50% by weight of a dissolved nitrite of an alkali metal or alkaline earth metal and 0.01 to 20% by weight of a dissolved organic silicon compound such as sodium methylsiliconate or potassium methylsiconate, or a dissolved or emulsified polymer thereof, or with a solution prepared by using an aliphatic alcohol having 1 to 3 carbon atoms, and containing 1 to 50% by weight of a dissolved nitrite of an alkali metal or alkaline earth metal and 0.01 to 20% by weight of an dissolved organic silicon compound such as methyltrimethoxysilane or ethyltrimethoxysilane, or a dissolved polymer thereof, and is allowed to dry in the air. Alternatively, the mass is coated with an unsolidified cement paste, mortar or concrete containing 1 to 25% by weight of a nitrite of an alkali metal or alkaline earth metal and 0.01 to 20% by weight of an organic silicon compound such as sodium or potassium methylsiliconate, or a polymer thereof, based on the weight of the cement which, e.g., the cement paste contains, and, e.g., the cement paste is allowed to harden in the air.

REFERENCES:
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patent: 3458327 (1969-07-01), Fraser
patent: 3914476 (1975-10-01), Nitzsche et al.
patent: 4125673 (1978-11-01), Roth et al.
patent: 4536534 (1985-08-01), Singer et al.
patent: 4559241 (1985-12-01), Obitsu et al.
patent: 4716051 (1987-12-01), Rodder
patent: 4931314 (1990-06-01), Takakura et al.

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