Accelerator admixture

Details Accelerator admixture Accelerator admixture

2007-02-27

2007-02-27

Green, Anthony J. (Department: 1755)

Compositions: coating or plastic

Materials or ingredients

Additive materials for inorganic cements which contain a...

C106S727000, C106S808000, C106S819000, C427S427000, C427S427100, C428S703000

Reexamination Certificate

active

10544979

ABSTRACT:
An accelerator composition for use with sprayed cementitious compositions, which is an aqueous solution or dispersion of a blend of the essential Components 1–3Component 1—aluminium sulphateComponent 2—at least one of an alkanolamine and an alkylene diamine or triamineComponent 3—hydrofluoric acidoptionally with at least one of Components 4–7, with the proviso that at least one of Component 4 or Component 5 be present:Component 4—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 and lithium sulphate;Component 5—C1–C10aliphatic mono- and dicarboxylic acids and their metal salts;Component 6—aluminium hydroxide;Component 7—at least one of phosphoric acid and phosphorous acid.The accelerators have excellent long-term stability and work well with “difficult” cements, such as some Japanese OPCs.

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