Mechanism of hydration reactions in the system C4A3SCSCaOH2O referred to hydration of sulphoaluminate cements

Phase equilibria in the system Ca₄Al₆O₁₂SO₄ – Ca₂SiO₄ – CaSO₄ – H₂O referring to the hydration of calcium sulfoaluminate cements

“…by [24][25][26][27][28]. The data by Winnefeld and Barlag [24], who investigated pure ye'elimite and ye'elimite blended with calcium sulfate at molar ratios of 0:1, 1:1, 1:2, 1:3 and 1:4 at a hydration time of 72 h, fit well to the predicted hydrate assemblages.…”

Contribution of limestone to the hydration of calcium sulfoaluminate cement

“…GEMS predicts the formation of monocarbonate instead of hemicarbonate. However, presumably due to kinetic reasons, hemicarbonate is formed preferably by reaction (4) Any portlandite present in the system will participate in the hydration reactions to form various hydrate phases such as solid solution (sulfate-hydroxy) AFm phases, see [7,9,11,14,37,38] for details.…”

“…With regard to the hydration kinetics, previous studies have indicated that the hydration of CSA cements and the resulting properties of CSA-based construction materials mainly depend on the amount and the reactivity of the added calcium sulfate [7][8][9][10][11][12][13][14][15]. The effect of calcium sulfate (anhydrite and gypsum) on the hydration of ye'elemite was investigated at Mvalues of 0, 1, 2, 3 and 4 [15].…”

Impact of anhydrite proportion in a calcium sulfoaluminate cement and Portland cement blend

“…Therefore, calcium and hydroxide ions (components of portlandite) released by OPC hydration can, for example, react with ye'elimite (Reaction IV) to form ettringite without gibbsite (Gastaldi et al, 2011;Hanic et al, 1989). In the presence of calcium hydroxide, ettringite formation requires the addition of a significant quantity of water and anhydrite.…”