Pozzolanic compositions containing fly ash and remediation agents for use in cementitious materials
First Claim
1. A pozzolanic composition for use in concrete, said composition comprising a non-spec fly ash and/or a Class C fly ash combined with a natural pozzolan, wherein said natural pozzolan is present in a concentration of about 1 wt % to about 99 wt %, wherein the combination of said natural pozzolan with said non-spec fly ash and/or said Class C fly ash results in said pozzolanic composition meeting a specification for pozzolanic mixtures, pozzolan admixtures, or supplementary cementitious materials in concrete under ASTM and/or AASHTO, wherein (a) when said composition comprises a non-spec fly ash, said specification is a Class C fly ash specification or a Class F fly ash specification pertaining to pozzolanic admixtures in concrete;
- and (b) when said composition comprises a Class C fly ash, said specification is a Class F fly ash specification.
1 Assignment
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Accused Products
Abstract
It has been unexpectedly discovered that the addition of a natural or other pozzolan to non-spec fly ash significantly improves the properties of the non-spec fly ash to the extent it can be certified under ASTM C618 and AASHTO 295, as either a Class F or Class C fly ash. The natural pozzolan may be a volcanic ejecta, such as pumice or perlite. Other pozzolans may also be used for this beneficiation process. Many pozzolans are experimentally tested and may be used to beneficiate non-spec fly ash into certifiable Class F fly ash. Additionally, this disclosure provides a method of converting a Class C fly ash to a more valuable Class F fly ash. This discovery will extend diminishing Class F fly ash supplies and turn non-spec fly ash waste streams into valuable, certified fly ash pozzolan which will protect and enhance concrete, mortars and grouts.
23 Citations
21 Claims
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1. A pozzolanic composition for use in concrete, said composition comprising a non-spec fly ash and/or a Class C fly ash combined with a natural pozzolan, wherein said natural pozzolan is present in a concentration of about 1 wt % to about 99 wt %, wherein the combination of said natural pozzolan with said non-spec fly ash and/or said Class C fly ash results in said pozzolanic composition meeting a specification for pozzolanic mixtures, pozzolan admixtures, or supplementary cementitious materials in concrete under ASTM and/or AASHTO, wherein (a) when said composition comprises a non-spec fly ash, said specification is a Class C fly ash specification or a Class F fly ash specification pertaining to pozzolanic admixtures in concrete;
- and (b) when said composition comprises a Class C fly ash, said specification is a Class F fly ash specification.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cementitious mixture comprising a pozzolanic composition for use in concrete, said composition comprising a non-spec fly ash and/or a Class C fly ash combined with a natural pozzolan, wherein said natural pozzolan is present in a concentration of about 1 wt % to about 99 wt % of said pozzolanic composition, wherein the combination of said natural pozzolan with said non-spec fly ash and/or said Class C fly ash results in said pozzolanic composition meeting a specification for pozzolanic mixtures, pozzolan admixtures, or supplementary cementitious materials in concrete under ASTM and/or AASHTO, wherein (a) when said composition comprises a non-spec fly ash, said specification Class C fly ash specification or a Class F fly ash specification pertaining to pozzolanic admixtures in concrete;
- and (b) when said composition comprises a Class C fly ash, said specification is a Class F fly ash specification.
- View Dependent Claims (12, 13, 14, 15, 16)
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17. A method of producing a pozzolanic composition for use in concrete, said method comprising:
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providing a source of fly ash that is a non-spec fly ash and/or a Class C fly ash; providing a natural pozzolan; and combining said non-spec fly ash and/or said Class C fly ash with said natural pozzolan, to produce a pozzolanic composition meeting a specification for pozzolanic mixtures, pozzolan admixtures, or supplementary cementitious materials in concrete under ASTM and/or AASHTO, wherein (a) when said composition comprises a non-spec fly ash, said specification is a Class C fly ash specification or a Class F fly ash specification, pertaining to pozzolanic mixtures, pozzolan admixtures, or supplementary cementitious materials in concrete, wherein said non-spec fly ash and/or said Class C fly ash is upgraded by the presence of said natural pozzolan to enhance its pozzolanic properties prior to addition of said pozzolanic composition to said concrete. - View Dependent Claims (18, 19, 20, 21)
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Specification