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Accelerated microstructural evolution of a calcium-silicate-hydrate (C-S-H) phase in pozzolanic pastes using fine siliceous sources: Comparison with historic pozzolanic mortars |
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| Authors: | A. Moropoulou A. Cakmak R. Van Grieken |
| Affiliation: | a Department of Chemical Engineering, National Technical University of Athens, 9 Iroon Polyechniou Street, Zografou Campus, Athens 15780, Greece b Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA c Department of Chemistry, Universitaire Instelling Antwerpen, Wilrijk, Antwerp B2610, Belgium |
| Abstract: | Traditional pozzolanic mortars such as those from Rhodes, Greece, or Hagia Sophia, Turkey, revealed the presence of a calcium-silicate-hydrate (C-S-H) binding phase. This phase, which is similar to that found in ordinary Portland cement (OPC), is produced under the pozzolanic reaction of slaked lime with fine reactive siliceous sources at temperatures <100 °C. The traditional siliceous sources were replaced by fumed silica or tetraethyl orthosilicate (TEOS). A microstructural analysis revealed an enhanced reaction rate but similar morphologies of the resultant C-S-H phases, confirming that the reaction-limiting factor is the dissolution of the siliceous sources. |
| Keywords: | Calcium-silicate-hydrate (C-S-H) Microstructure Cement paste Pozzolan Mortar |
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