Impact of calcium aluminate cement and calcium sulfate on gel C-A-S-H formation during the Portland cement hydration
This study examines how calcium aluminate cement (CAC) and calcium sulfate influence the hydration and gel structure of Portland cement (PC). A binary PC/CAC (85/15) mix was compared with ternary systems containing 3% and 5% calcium sulfate under two curing conditions. FTIR and 29Si NMR analyses sho...
| Autores: | , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/449506 |
| Acceso en línea: | https://hdl.handle.net/2117/449506 https://dx.doi.org/10.3989/mc.2025.417825 |
| Access Level: | acceso abierto |
| Palabra clave: | Portland cement Calcium aluminate cement Calcium sulfate C-A-S-H FTIR Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures::Materials i estructures de formigó |
| Sumario: | This study examines how calcium aluminate cement (CAC) and calcium sulfate influence the hydration and gel structure of Portland cement (PC). A binary PC/CAC (85/15) mix was compared with ternary systems containing 3% and 5% calcium sulfate under two curing conditions. FTIR and 29Si NMR analyses showed that CAC promotes aluminum incorporation into the C-S-H gel, leading to a more homogeneous C-A-S-H structure. Water curing further enhanced this integration, with increased Q² and reduced Q¹ signals. Calcium sulfate addition mitigated the silicate hydration delay caused by CAC and promoted longer silicate chains and higher Al(IV)/Si ratios. Overall, CAC enhances aluminum incorporation, while calcium sulfate improves silicate polymerization, resulting in a more uniform and well-structured C-A-S-H gel. |
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