Method for producing a blended cementitious composition
AssigneeRHA Technology, Inc.
InventorPovindar K. Mehta
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Abstract
Cementitious compositions and methods for making the compositions wherein the compositions include high volume of mineral admixtures such as fly ash and blast-furnace slag in combination with rice hull ash. In one embodiment, the cementitious composition is a blend of hydraulic cement, rice hull ash and a mineral addition selected from fly ash and blast-furnace slag. The cementitious compositions can advantageously have high early and 28-day compressive strength and a very low permeability rating.
Claims34
A method for producing a blended cementitious composition, the method comprising the step of intermixing at least about 5 weight percent rice hull ash, at least about 40 weight percent fly ash and hydraulic cement.
A blended cement composition, comprising:
- a) at least about 30 weight percent hydraulic cement;
- b) from about 5 weight percent to about 20 weight percent rice hull ash;
- and
- c) at least about 40weight percent of fly ash.
A concrete mixture, comprising:
- a) a blended cement composition comprising at least about 30 weight percent hydraulic cement, at least about 5 weight percent rice hull ash and at least about 40 weight percent fly ash;
- b) aggregate;
- and
- c) water.
A concrete mixture, comprising:
- a) a blended cement composition comprising hydraulic cement, rice hull ash and at least about 40 weight percent fly ash;
- b) aggregate;
- and
- c) water, wherein said concrete mixture has a 28-day compressive strength as measured by ASTM C 39 of at least about 50 MPa and a 28-day permeability as measured by ASTM C 1202 of not greater than about 1000 coulombs.
Dependencies are inferred from the claim text.