Beneficial use of a cell coupling rheometry, conductimetry, and calorimetry to investigate the early age hydration of calcium sulfoaluminate cement |
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Authors: | Jean-Baptiste Champenois Celine Cau Dit Coumes Arnaud Poulesquen Patrick Le Bescop Denis Damidot |
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Affiliation: | 1. DEN/DTCD/SPDE, Commissariat à l’Energie Atomique et aux Energies Alternatives, BP17171, 30207, Bagnols sur Cèze, France 2. DEN/DPC/SECR, Commissariat à l’Energie Atomique et aux Energies Alternatives, 91192, Gif-sur-Yvette, France 3. MPE-GCE, EM Douai, 59508, Douai, France
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Abstract: | A specific cell was designed to monitor simultaneously the evolution of the viscoelastic properties, electrical conductivity, and temperature of a cement paste with ongoing hydration. Hydration of calcium sulfoaluminate cement by demineralised water or by a borated solution was then investigated as an example. Borate anions acted as set retarders but to a smaller extent than with ordinary Portland cement. The delay in cement hydration resulted from the precipitation of an amorphous or poorly crystallized calcium borate, which also caused a rapid stiffening (and thus a loss of workability) of the paste after mixing. The gypsum content of the CSA cement was shown to play a key role in the control of the cement reactivity. |
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