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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
Cau Dit Coumesa, C
Le Bescop, Patrick
|Affiliations:||Department of Civil and Environmental Engineering||Keywords:||Sulfoaluminate (D)
Cement paste (D)
|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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