A new geopolymeric binder from hydrated-carbonated cement
This paper evaluates the use of hydrated Portland cement as the raw material in the production of geopolymers. The silicon and aluminium oxides needed for the geopolymerization process were produced by the carbonation of hydrated Portland cement, which transforms CSH and CAH (Portland cement hydrate...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2012 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/49000 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/49000 |
| Access Level: | acceso abierto |
| Palabra clave: | Alkali activation Carbonated cement Construction and demolition waste Low CO 2-emission binder Thermogravimetry Alkali activated Alkaline activation Alumina gel Aluminium oxide Geopolymeric binder Geopolymerization Mechanically stable Micro-structural Alumina Binders Carbon dioxide Carbonation Demolition Geopolymers Hydration Inorganic polymers Mechanical properties Mortar Portland cement Silica Thermogravimetric analysis Hydrated alumina INGENIERIA DE LA CONSTRUCCION |
| Sumario: | This paper evaluates the use of hydrated Portland cement as the raw material in the production of geopolymers. The silicon and aluminium oxides needed for the geopolymerization process were produced by the carbonation of hydrated Portland cement, which transforms CSH and CAH (Portland cement hydrates) into silica and alumina gels. Hydrated-carbonated Portland cement was alkali activated with a NaOH/waterglass solution. Pastes and mortars were prepared, and micro-structural and mechanical properties were analyzed. It has been noted that geopolymers are mechanically stable and yield compressive strength higher than 10 MPa when mortars are cured at 65 °C for 3 days. The results have shown that there are interesting possibilities for re-using the cement-rich fraction of construction and demolition waste. Alkaline activation of hydrated-carbonated Portland cement could be considered a low CO 2-emission binder. © 2012 Elsevier B.V. All rights reserved. |
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