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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
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.
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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