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Composition of fly ash cement

A cement composition comprising industrial waste containing calcium oxide and a retarder is disclosed. The cement composition is free of Portland cement. The composition also includes an alkali metal oxide, a hydrocarboxylic acid, and a sulphate compound. The cement may be used in methods for cementing subterranean formations such as oil and gas wells

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  • The Use of Fly Ash in Concrete: Classification by Composition
    The Use of Fly Ash in Concrete: Classification by Composition

    Dec 01, 1999 Dec 01, 1999 Fly ash has been used as a pozzolanic admixture in concrete for more than 50 years. Earlier uses were largely confined to low-calcium ashes from hard bituminous or anthracite coals. However, increased demand for fly ash coupled with the declining availability of suitable low-calcium ashes has attracted a wider variety of fly ashes to the

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  • US6482258B2 - Fly ash composition for use in concrete mix
    US6482258B2 - Fly ash composition for use in concrete mix

    A fly ash composition is provided which includes a blend of Class C fly ash, potassium carbonate, and lithium carbonate, which, in combination, reduce alkali silica reactivity when the fly ash composition is used in concrete applications. The fly ash composition includes from about 65 to 99 wt % Class C fly ash, from about 0.1 wt. % to about 4 wt % potassium carbonate, and from about 0.1 wt

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  • US6251178B1 - Fly ash composition - Google Patents
    US6251178B1 - Fly ash composition - Google Patents

    A fly ash composition is provided which includes an amount of lithium carbonate to reduce alkali silica reactivity when the fly ash composition is used in concrete applications. The fly ash composition includes from about 0.5 wt.% to about 98% wt.% subbituminous fly ash and from about 0.5 wt.% to about 3 wt.% lithium carbonate

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  • Using particle composition of fly ash to predict concrete
    Using particle composition of fly ash to predict concrete

    Mar 01, 2020 Fly ash is a waste material from the point of view of the power generation. However, because of the good performance and economic and environmental benefits of fly ash in concrete, the demand has grown steadily [5,6]. Over 98% of the ready mix concrete companies in the United States have used fly ash in concrete

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  • Chapter 3 - Fly Ash in Portland Cement Concrete - Fly Ash
    Chapter 3 - Fly Ash in Portland Cement Concrete - Fly Ash

    Jun 27, 2017 Typically, 15 percent to 30 percent of the portland cement is replaced with fly ash, with even higher percentages used for mass concrete placements. An equivalent or greater weight of fly ash is substituted for the cement removed. The substitution ratio

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  • CONCRETE Optimizing the Use of Fly Ash in Concrete
    CONCRETE Optimizing the Use of Fly Ash in Concrete

    utilization of fly ash in concrete began (for example, USBR 1948) follow-ing the pioneering research conducted at the University of California, Berkeley (Davis 1937).The last 50 years has seen the use of fly ash in concrete grow dramatically with close to 15 million tons used in con-crete, concrete products and grouts in the U.S. in 2005 (ACAA

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  • Chemical Comparison - fly ash
    Chemical Comparison - fly ash

    analyses for two fly ashes and a natural pozzolan (Class F fly ash, Class C fly ash and Class N - Natural) and ordinary portland cement. A glance at the table reveals that the same compounds exist in fly ash and portland cement. Those of fly ash are amorphous (glassy) due to rapid cooling; those of cement are crystalline, formed by slower cooling

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  • Fly Ash in Concrete | Advantages & Disadvantages of Fly
    Fly Ash in Concrete | Advantages & Disadvantages of Fly

    What Is Fly Ash? Fly ash is a fine powder that would be a by-product of the combustion of pulverized coal in power plants. Fly ash is a pozzolan, a liquid that contains aluminous as well as siliceous material which creates cement in the presence of water.. When combined with lime and water, fly ash creates a similar composition to Portland cement.. This renders fly ash ideal as a raw material

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  • Biomass fly ash in concrete: SEM, EDX and ESEM analysis
    Biomass fly ash in concrete: SEM, EDX and ESEM analysis

    Mar 01, 2008 Mar 01, 2008 Fig. 2 shows the crystal of CH, the product of cement hydration and the reactants of pozzolanic reaction, which has a laminar morphology in (a) and supported by EDX analysis in (b) , .The fly ash particles in the concrete mix react slowly with CH to form C–S–H gels, and the process goes on for years , , , . Fig. 3 shows the barely reactive Class F fly ash particles in a 56-day

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  • Fly Ash as a Portland Cement Raw Material
    Fly Ash as a Portland Cement Raw Material

    Aug 09, 2019 The fly ash, if added to the cement manufacturing process at either of these two points, remains fly ash and although thoroughly blended into the portland cement will perform about the same functions in concrete as if it were added later by being blended with other ingredients during the concrete manufacturing process

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  • Composition of C-S-H in the Hydration Products of Fly Ash
    Composition of C-S-H in the Hydration Products of Fly Ash

    Apr 01, 2007 Title: Composition of C-S-H in the Hydration Products of Fly Ash-Cement System Author(s): P. Termkhajornkit and T. Nawa Publication: Symposium Paper Volume: 242 Issue: Appears on pages(s): 361-374 Keywords: bonding water; C-S-H gel; fly ash; rietveld analysis; selective dissolution Date: 4/1/2007 Abstract: This paper describes the effect of fly ash on composition of C-S-H gel

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  • How to estimate the compound composition of fly ash?!
    How to estimate the compound composition of fly ash?!

    May 16, 2017 May 16, 2017 On clarification, I have the chemical composition of both cement and fly ash (material). The compound composition (C3S, C2S, C3A and C4AF) of cement was estimated using Bogue's equation

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  • Fly Ash - Properties, Types, Mechanism and Uses - The
    Fly Ash - Properties, Types, Mechanism and Uses - The

    Fly ash is a heterogeneous by-product material produced in the combustion process of coal used in power stations. It is a fine grey coloured powder having spherical glassy particles that rise with the flue gases. As fly ash contains pozzolanic materials components which reach with

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  • Fly Ash in Concrete | Advantages & Disadvantages of
    Fly Ash in Concrete | Advantages & Disadvantages of

    Fly Ash Composition. Fly ash consists primarily of oxides of silicon, aluminum iron and calcium. Magnesium, potassium, sodium, titanium, and sulfur are also present to a lesser degree. When used as a mineral admixture in concrete, fly ash is classified as either Class C or Class F ash based on its chemical composition

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