Chloride-free hardening accelerant for portland cement and proce

Details Chloride-free hardening accelerant for portland cement and proce Chloride-free hardening accelerant for portland cement and proce

1986-12-11

1988-05-31

Capella, Steven

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106314, 106315, C04B 2412

Patent

active

047478772

ABSTRACT:
This invention relates to a chloride-free hardening accelerant for Portland cement which is active in particular at low temperatures and contains calcium nitrate, sodium nitrate, hexamethylenetetramine and sodium hydroxide. The accelerant is prepared by reacting the calculated amount of formaldehyde with calcium ammonium nitrate in aqueous solution at between room temperature and 55.degree. C. under alkaline conditions established with sodium hydroxide. After the reaction had ended this solution can be used directly as such or be converted into a powder by means of a suitable drying operation.

REFERENCES:
patent: 1972207 (1934-09-01), Tucker
patent: 2141569 (1938-12-01), Tucker et al.
patent: 2390138 (1945-12-01), Vallandigham
patent: 2478831 (1949-08-01), MacPerson
patent: 3359225 (1967-12-01), Weisand
patent: 3537869 (1970-11-01), Proell
patent: 4337094 (1982-06-01), Tokar
Betonwerk & Fertigteil-Technik, Heft; Aug. 1972, pp. 571, 577.

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