Modification of pozzolanic chemistry through blending
First Claim
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1. A method for blending different pozzolan streams to form a blended pozzolan for later blending with cement and having at least one chemical characteristic within one or more selected ranges, the method comprising:
- establishing the one or more selected ranges for the at least one chemical characteristic of the blended pozzolan;
providing a first pozzolan stream having at least one variable chemical characteristic;
providing a second pozzolan stream that differs from the first pozzolan stream relative to at least one chemical characteristic selected from the group consisting of calcium oxide content, aluminate content, silicate content, ratio of aluminate to silicate, iron content, magnesium content, and sulfate content;
blending the first pozzolan stream with the second pozzolan stream at a blending ratio so as to produce the blended pozzolan;
measuring the at least one chemical characteristic of the blended pozzolan in a series of readings and determining whether the at least one chemical characteristic is within the one or selected ranges; and
upon determining that the at least one measured chemical characteristic is outside the one or more selected ranges, modifying the blending ratio of the first and second pozzolans streams so that the at least one chemical characteristic of the blended pozzolan is restored to within the one or more selected ranges.
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Abstract
The present disclosure relates to methods for controlling the chemical composition of a first pozzolan by blending it with a different pozzolan having a different chemical composition. The method includes intimately mixing the two pozzolans and using a chemical analyzer to determine a chemical characteristic of the pozzolan fraction being produced. The output from the chemical analyzer is then used to control the blending of the first and second outputs to maintain the chemical characteristic within a desired range.
39 Citations
20 Claims
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1. A method for blending different pozzolan streams to form a blended pozzolan for later blending with cement and having at least one chemical characteristic within one or more selected ranges, the method comprising:
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establishing the one or more selected ranges for the at least one chemical characteristic of the blended pozzolan; providing a first pozzolan stream having at least one variable chemical characteristic; providing a second pozzolan stream that differs from the first pozzolan stream relative to at least one chemical characteristic selected from the group consisting of calcium oxide content, aluminate content, silicate content, ratio of aluminate to silicate, iron content, magnesium content, and sulfate content; blending the first pozzolan stream with the second pozzolan stream at a blending ratio so as to produce the blended pozzolan; measuring the at least one chemical characteristic of the blended pozzolan in a series of readings and determining whether the at least one chemical characteristic is within the one or selected ranges; and upon determining that the at least one measured chemical characteristic is outside the one or more selected ranges, modifying the blending ratio of the first and second pozzolans streams so that the at least one chemical characteristic of the blended pozzolan is restored to within the one or more selected ranges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 13, 14)
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11. A method for blending different fly ashes together to form blended fly ash for later blending with cement and having at least one chemical or physical characteristic within one or more selected ranges, the method comprising:
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providing a first fly ash; providing a second fly ash that differs from the first fly ash with respect to at least one chemical or physical characteristic; blending the first fly ash with the second fly ash at a blending ratio to produce blended fly ash; measuring the at least one chemical or physical characteristic of the blended fly ash in a series of readings and determining whether the at least one chemical or physical characteristic is within the one or more selected ranges; and upon determining that the at least one chemical or physical characteristic of the blended fly ash is outside the one or more selected ranges, modifying the blending ratio of the first and second fly ashes so that the at least one chemical or physical characteristic of the blended fly ash is restored to within the one or more selected ranges. - View Dependent Claims (15, 16, 17, 18)
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19. A method for maintaining the calcium oxide content of a blended pozzolan within an established range prior to blending with cement, comprising:
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blending two or more pozzolans that differ in calcium oxide content to form the blended pozzolan; measuring the calcium oxide content of the blended pozzolan and determining whether the calcium oxide content is within the established range; and upon determining that the calcium oxide content of the blended pozzolan is outside the established range, modifying a blending ratio of the two or more pozzolans to restore the calcium oxide content of the blended pozzolan to within the established range. - View Dependent Claims (20)
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Specification