Rapid setting accelerators for cementitious compositions
First Claim
Patent Images
1. An improved process for shotcreting comprising:
- (1) hydrating a dry mixture consisting essentially of (a) cement and (b) set accelerators comprising an alkali metal carbonate and an inorganic salt of ferric iron other than ferric phosphate, said set accelerators being sufficiently dispersed in the cement mixture to sustantially prevent them from reacting with each other by causing them to react with components of the cement;
(2) within at most 10 minutes after said hydration, affixing the hydrated mixture into the desired conformation.
4 Assignments
0 Petitions
Accused Products
Abstract
A mixture comprised of an alkali metal carbonate and an inorganic salt of ferric iron, other than ferric phosphate, is an accelerator for cementitious compositions and is particularly useful for shotcrete and hand-applied mortar. The preferred alkali metal carbonates are sodium carbonate and potassium carbonate and the preferred ferric iron salts are ferric sulfate, ferric chloride and ferric nitrate. The mixture achieves initial set times of at most about 3 minutes and final set times of at most about 10 minutes. Both initial and final set times are shorter than predicted by simply averaging the corresponding set times of both components when used alone.
-
Citations
6 Claims
-
1. An improved process for shotcreting comprising:
-
(1) hydrating a dry mixture consisting essentially of (a) cement and (b) set accelerators comprising an alkali metal carbonate and an inorganic salt of ferric iron other than ferric phosphate, said set accelerators being sufficiently dispersed in the cement mixture to sustantially prevent them from reacting with each other by causing them to react with components of the cement; (2) within at most 10 minutes after said hydration, affixing the hydrated mixture into the desired conformation. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeSandoz Inc. (Novartis Ag)
-
Original AssigneeProtex Industries, Inc.
-
InventorsSchutz, Raymond J.
-
Primary Examiner(s)Poer, James
-
Application NumberUS06/463,259Time in Patent Office447 DaysField of Search106/89, 106/315US Class Current106/692CPC Class CodesC04B 28/02 containing hydraulic cement...
