Patent ID: 7198669

Claim:
An accelerator composition for use with sprayed cementitious compositions, which comprises an aqueous solution or dispersion of a blend of: about 30 to about 60% aluminium sulphate, calculated on the basis of Al 2 (SO 4 ) 3 .14.3H 2 O, about 0.1 to about 15% of at least one of an alkanolamine, an alkylene diamine or alkylene triamine, about 0.2 to about 8% hydrofluoric acid, (a) up to about 15% of at least one of sodium hydroxide, potassium hydroxide, lithium hydroxide, magnesium hydroxide, lithium carbonate, sodium carbonate, potassium carbonate, magnesium carbonate, sodium sulphate, potassium sulphate, magnesium sulphate, or lithium sulphate; and (b) greater than 0% up to about 15% of at least one of C 1 –C 10 aliphatic monocarboxylic acids, a metal salt of C 1 –C 10 aliphatic monocarboxylic acids, C 1 –C 10 aliphatic dicarboxylic acids or a metal salt of C 1 –C 10 aliphatic dicarboxylic acids; having an alkali metal equivalent greater than 1% Na 2 O equivalent.