CE 308 Lec 4 Admixtures

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    CE 308

    Plain and Reinforced Concrete I

    Admixtures

    Dr. WasimKhaliq

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    Admixtures

    Types

    Chemical Admixtures

    Mineral Admixtures

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    Admixtures

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    Mineral Admixtures

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    By Products

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    Pozzolanic Reaction

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    Blast Furnace Slag

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    Pozzolans Effect on Strength

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    Chemical Admixtures

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    Admixtures Effect

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    Use of Chemical Admixtures

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    Air Entrainment

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    ater Reducers

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    Classification of ater Reducers

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    Su!er!lasticizer "SP# or $igh Range ater Reducers "$RR#

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    Mechanism of ater Reduction

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    Mechanism

    Electrostatic dispersion of cementgrains

    Steric stabilization dispersion ofcement grains

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    Effects on Fresh Pro!erties

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    Effects on Fresh Pro!erties

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    Effects on $ardened !ro!erties

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    Set%Accelerating Admixtures

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    Set%Retarding Admixtures

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    Extended Set Control "Ready Mixed Concrete#

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    Effect on Concrete Pro!erties

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    Chemical Admixtures Effect on Strength