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Title: | Leaching of calcium sulfoaluminate cement pastes by water at regulated pH and temperature: experimental investigation and modeling | Authors: | Berger, Stephane Aouad, Georges Cau Dit Coumesa, C Le Bescop, Patrick Damidot, Denis |
Affiliations: | Department of Civil and Environmental Engineering | Keywords: | Sulfoaluminate (D) Cement paste (D) Degradation (C) Characterization (B) Modeling (E) |
Issue Date: | 2013 | Part of: | Journal of cement and concrete research | Volume: | 53 | Start page: | 211 | End page: | 220 | Abstract: | Two cement pastes, prepared with a ye'elimite-rich calcium sulfoaluminate binder containing 0% or 20% gypsum, were leached by water at regulated pH (7) and temperature (20 °C) for three months with the aim of understanding and modeling the degradation processes. The cumulative quantities of Ca2 +, OH− and SO42 − ions in the leachates increased linearly versus the square root of time, showing that leaching was controlled by diffusion. The gypsum-free material exhibited the highest decalcification rate. Examination of the solid samples after three months revealed three zones: -the surface layer, highly porous and composed of AH3, perovskite and possibly C-(A)-S-H, -an intermediate zone, less porous, in which several precipitation and dissolution fronts occurred, and -the sound core. The hydrated phase evolution along depth was accurately determined and qualitatively reproduced with a model coupling transport by diffusion and chemical reactions. |
URI: | https://scholarhub.balamand.edu.lb/handle/uob/2188 | DOI: | 10.1016/j.cemconres.2013.06.014 | Ezproxy URL: | Link to full text | Type: | Journal Article |
Appears in Collections: | Department of Civil and Environmental Engineering |
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