Influence of pozzolans and slag on the microstructure of partially carbonated cement paste by means of water vapour and nitrogen sorption experiments and BET calculations |
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| Authors: | N De Belie J Kratky S Van Vlierberghe |
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| Affiliation: | 1. Graduate School of Environmental Studies, Nagoya University ES Building, No. 546, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan;2. Doctoral student, Graduate School of Environmental Studies, Nagoya University ES Building, No. 539, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan;3. Master’s course student, Graduate School of Environmental Studies, Nagoya University ES Building, No. 539, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan;1. Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ, USA;2. Andlinger Center for Energy and the Environment, Princeton University, Princeton, NJ, USA;3. Université Paris-Est, IFSTTAR, MAT, F-75732 Paris, France;4. Université Paris-Est, Laboratoire Navier, Ecole des Ponts ParisTech, IFSTTAR, CNRS, F-77455 Marne-la-Vallée, France;5. DGAC/STAC, F-94485 Bonneuil-sur-Marne, France |
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| Abstract: | The influence of water-to-binder ratio (0.33 to 0.50) and additions (fly ash, slag, silica fume) on the microstructure of partially carbonated cement pastes was studied by nitrogen sorption and static and dynamic water vapour sorption. The selected technique affects macropore condensation and accessibility of pores, while predrying influences removal of CSH interlayer water. BJH calculations showed the increased amount of capillary pores with higher water-to-cement ratio, and the decrease of micropores (< 2 nm), in pastes with 50% or more fly ash or slag. Paste with 10% SF showed a high amount of gel pores, related to the higher amount of CSH gel, calculated from adsorption at 23% RH. A linear relation was observed between BET specific surface and water-cement ratio. Thermogravimetric analysis illustrated the influence of water-cement ratio and pozzolanic materials on the portlandite content. Introduction of silica fume, increased the specific surface accessible to water, but not to nitrogen molecules. |
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