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    Fly Ash Slag Geopolymer Concrete: Resistance to Sodium and Magnesium Sulfate Attack

    This study evaluated the performance of geopolymer concretes based on a binary mixture of fly ash (FA) with blast furnace slag (GBFS) in an 80 / 20 ratio and activated with a mixture of sodium silicate and sodium hydroxide. FA/GBFS and portland cement (OPC) concretes were immersed in 5% by weight sodium sulfate and magnesium sulfate solutions. Volumetric expansion and mechanical resistance loss were measured, and the reaction products were characterized by X-ray diffraction and scanning electron microscopy. The highest levels of deterioration were found in the probes exposed to MgSO 4 , indicating the higher aggressiveness of this solution. After aging for 360 days in MgSO 4 , the FA/GBFS concrete expanded by 0.04% and decreased its mechanical resistance by 33%, compared to 0.08 and 48%, respectively, for similarly treated OPC concretes. However, the same exposure to Na 2 SO 4 increased the observed FA/GBFS resistance while reducing the mechanical resistance of OPC by 30%. This relates to their respective expansion percentages of 0.0068 and 0.412% and the presence of expansive ettringite in the OPC concretes.

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    Fly Ash Slag Geopolymer Concrete: Resistance to Sodium and Magnesium Sulfate Attack

    This study evaluated the performance of geopolymer concretes based on a binary mixture of fly ash (FA) with blast furnace slag (GBFS) in an 80 / 20 ratio and activated with a mixture of sodium silicate and sodium hydroxide. FA/GBFS and portland cement (OPC) concretes were immersed in 5% by weight sodium sulfate and magnesium sulfate solutions. Volumetric expansion and mechanical resistance loss were measured, and the reaction products were characterized by X-ray diffraction and scanning electron microscopy. The highest levels of deterioration were found in the probes exposed to MgSO 4 , indicating the higher aggressiveness of this solution. After aging for 360 days in MgSO 4 , the FA/GBFS concrete expanded by 0.04% and decreased its mechanical resistance by 33%, compared to 0.08 and 48%, respectively, for similarly treated OPC concretes. However, the same exposure to Na 2 SO 4 increased the observed FA/GBFS resistance while reducing the mechanical resistance of OPC by 30%. This relates to their respective expansion percentages of 0.0068 and 0.412% and the presence of expansive ettringite in the OPC concretes.

    Access

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    Check availability in my library
    Order at Subito €

    Fly Ash Slag Geopolymer Concrete: Resistance to Sodium and Magnesium Sulfate Attack

    This study evaluated the performance of geopolymer concretes based on a binary mixture of fly ash (FA) with blast furnace slag (GBFS) in an 80 / 20 ratio and activated with a mixture of sodium silicate and sodium hydroxide. FA/GBFS and portland cement (OPC) concretes were immersed in 5% by weight sodium sulfate and magnesium sulfate solutions. Volumetric expansion and mechanical resistance loss were measured, and the reaction products were characterized by X-ray diffraction and scanning electron microscopy. The highest levels of deterioration were found in the probes exposed to MgSO 4 , indicating the higher aggressiveness of this solution. After aging for 360 days in MgSO 4 , the FA/GBFS concrete expanded by 0.04% and decreased its mechanical resistance by 33%, compared to 0.08 and 48%, respectively, for similarly treated OPC concretes. However, the same exposure to Na 2 SO 4 increased the observed FA/GBFS resistance while reducing the mechanical resistance of OPC by 30%. This relates to their respective expansion percentages of 0.0068 and 0.412% and the presence of expansive ettringite in the OPC concretes.

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    Title:

    Fly Ash Slag Geopolymer Concrete: Resistance to Sodium and Magnesium Sulfate Attack

    Contributors:

    Valencia Saavedra, William Gustavo (author) / Angulo, Daniela Eugenia (author) / Mejía de Gutiérrez, Ruby (author)

    Published in:

    Journal of Materials in Civil Engineering ; 28

    Publication date:

    2016-07-01

    ISSN:

    0899-1561 , 1943-5533

    DOI:

    https://doi.org/10.1061/(ASCE)MT.1943-5533.0001618

    Type of media:

    Article (Journal)

    Type of material:

    Electronic Resource

    Language:

    Unknown

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