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US 9,284,226 B2Granted
Cementitious compositions
AssigneesMinova International Limited, University of Kentucky
InventorsPeter Shelley Mills, Thomas L. Robl, Robert F. Rathbone, Robert Benjamin Jewell
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Abstract
The invention provides a cementitious composition comprising a cement component comprising (i) an accelerant, (ii) a calcium sulphate source and (iii) an ettringite forming cement; an aggregate; and optionally water; wherein the cement has a minimum unconfined compressive strength of 1500 psi when tested in accordance with ASTM C1140 and/or C1604 at 15 minutes after placement; methods for its use and concrete formed from it.
Claims14
A gunite forming composition consisting of:
- (a) a dry cement component which consists of (i) a nucleation agent accelerant, (ii) a calcium sulphate source selected from the group consisting of beta anhydrite, gypsum and hemi-hydrate, and (iii) from 30% by weight of calcium sulphoaluminate as an ettringite forming cement, and
- (b) an aggregate, wherein
- the weight ratio of the aggregate (b) to the cement component (a) is from about 2:1 to about 6:1, and wherein
- when the composition is mixed with water, the resulting mixture has undergone final set and hardened sufficiently to possess a minimum unconfined compressive strength of 1500 psi when tested in accordance with ASTM C1140 and/or C1604 at 15 minutes after placement.
1 more element
Dependencies are inferred from the claim text.