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Título: | Effect of alkali concentration on the activation of carbonate-high illite clay |
Autor: | D’Elia, Angela; Pinto, Daniela; Eramo, Giacomo; Laviano, Rocco; Palomo, Ángel CSIC ORCID; Fernández-Jiménez, Ana CSIC ORCID | Fecha de publicación: | 25-mar-2020 | Editor: | Multidisciplinary Digital Publishing Institute | Citación: | Applied Sciences 10(7): 2203 (2020) | Resumen: | The present study explores the effect of activating solution concentration (4, 6 and 8 M NaOH) on mechanically and thermally pre-treated carbonate-high illite clay (LCR). Pastes were prepared with an alkaline solution/clay (S/B) ratio of 0.55, which were cured at room temperature and relative humidity > 90% in a climatic chamber. At two and 28 days, compressive mechanical strength was determined, and the reaction products were characterised by X-ray Powder Diffraction analysis (XRPD), Fourier-transform infrared spectroscopy (FTIR) and Scanning Electron Microscopy - Energy Dispersive X-ray spectroscopy (SEM/EDX). Results obtained showed that the presence of reactive calcium in the starting clay induces co-precipitation of a mix of gels: An aluminium-enriched C-S-H gel (C-A-S-H) and a N-A-S-H gel, in which sodium is partially replaced by calcium (N,C)-A-S-H. Pastes prepared with higher (6 or 8 M) activator concentrations exhibit a more compact matrix than the ones prepared with 4 M NaOH. The findings show that the use of a 6 M NaOH solution yields a binder with two days compressive strength >20 MPa and 28 days strength of over 30 MPa. | Descripción: | This article belongs to the Special Issue Low Binder Concrete and Mortars. | Versión del editor: | https://doi.org/10.3390/app10072203 | URI: | http://hdl.handle.net/10261/207697 | DOI: | 10.3390/app10072203 | Identificadores: | doi: 10.3390/app10072203 |
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