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Barbara Lothenbach – One of the best experts on this subject based on the ideXlab platform.

  • alkali silica Reaction the influence of calcium on silica dissolution and the formation of Reaction Products
    Journal of the American Ceramic Society, 2011
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkalisilica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.

  • Alkali–Silica Reaction: the Influence of Calcium on Silica Dissolution and the Formation of Reaction Products
    Journal of the American Ceramic Society, 2010
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkalisilica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.

Andreas Leemann – One of the best experts on this subject based on the ideXlab platform.

  • alkali silica Reaction the influence of calcium on silica dissolution and the formation of Reaction Products
    Journal of the American Ceramic Society, 2011
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkali―silica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.

  • Alkali–Silica Reaction: the Influence of Calcium on Silica Dissolution and the Formation of Reaction Products
    Journal of the American Ceramic Society, 2010
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkali―silica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.

Daniel Rentsch – One of the best experts on this subject based on the ideXlab platform.

  • alkali silica Reaction the influence of calcium on silica dissolution and the formation of Reaction Products
    Journal of the American Ceramic Society, 2011
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkali―silica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.

  • Alkali–Silica Reaction: the Influence of Calcium on Silica Dissolution and the Formation of Reaction Products
    Journal of the American Ceramic Society, 2010
    Co-Authors: Andreas Leemann, Gwenn Le Saout, Frank Winnefeld, Daniel Rentsch, Barbara Lothenbach
    Abstract:

    In a model system for alkali―silica Reaction consisting of microsilica, portlandite (0-40 mass%), and 1M alkaline solutions (NaOH, KOH), the influence of calcium on silica dissolution and on the formation of Reaction Products is investigated. The Reaction and its Products are characterized using calorimetry, X-ray diffraction, thermogravimetric analysis, nuclear magnetic resonance, desorption experiments, and pore solution analysis in combination with thermodynamic modeling. Silica dissolution proceeds until portlandite is consumed due to the formation of C-S-H, and subsequently, saturation of dissolved silica in the alkaline solution is reached. As a result, the amount of dissolved silica increases with the increasing portlandite content. Depending on the amount of portlandite added, the Reaction Products show differences in the relative amounts of Q 1 , Q 2 , and Q 3 sites formed and in their average Ca/Si ratio. The ability of the Reactions Products to chemically bind water decreases with the decreasing relative amount of Q 3 sites and with the increasing Ca/Si ratio. However, the amount of physically bound water in the Reaction Products reaches a maximum value at a Ca/Si ratio between 0.20 and 0.30.