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XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition

Coal ash-based geopolymers with mine tailings addition activated with phosphate acid were synthesized for the first time at room temperature. In addition, three types of aluminosilicate sources were used as single raw materials or in a 1/1 wt. ratio to obtain five types of geopolymers activated with...

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Autores principales: Burduhos Nergis, Dumitru Doru, Vizureanu, Petrica, Sandu, Andrei Victor, Burduhos Nergis, Diana Petronela, Bejinariu, Costica
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745797/
https://www.ncbi.nlm.nih.gov/pubmed/35009346
http://dx.doi.org/10.3390/ma15010202
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author Burduhos Nergis, Dumitru Doru
Vizureanu, Petrica
Sandu, Andrei Victor
Burduhos Nergis, Diana Petronela
Bejinariu, Costica
author_facet Burduhos Nergis, Dumitru Doru
Vizureanu, Petrica
Sandu, Andrei Victor
Burduhos Nergis, Diana Petronela
Bejinariu, Costica
author_sort Burduhos Nergis, Dumitru Doru
collection PubMed
description Coal ash-based geopolymers with mine tailings addition activated with phosphate acid were synthesized for the first time at room temperature. In addition, three types of aluminosilicate sources were used as single raw materials or in a 1/1 wt. ratio to obtain five types of geopolymers activated with H(3)PO(4). The thermal behaviour of the obtained geopolymers was studied between room temperature and 600 °C by Thermogravimetry-Differential Thermal Analysis (TG-DTA) and the phase composition after 28 days of curing at room temperature was analysed by X-ray diffraction (XRD). During heating, the acid-activated geopolymers exhibited similar behaviour to alkali-activated geopolymers. All of the samples showed endothermic peaks up to 300 °C due to water evaporation, while the samples with mine tailings showed two significant exothermic peaks above 400 °C due to oxidation reactions. The phase analysis confirmed the dissolution of the aluminosilicate sources in the presence of H(3)PO(4) by significant changes in the XRD patterns of the raw materials and by the broadening of the peaks because of typically amorphous silicophosphate (Si–P), aluminophosphate (Al–P) or silico-alumino-phosphate (Si–Al–P) formation. The phases resulted from geopolymerisation are berlinite (AlPO(4)), brushite (CaHPO(4)∙2H(2)O), anhydrite (CaSO(4)) or ettringite as AFt and AFm phases.
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spelling pubmed-87457972022-01-11 XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition Burduhos Nergis, Dumitru Doru Vizureanu, Petrica Sandu, Andrei Victor Burduhos Nergis, Diana Petronela Bejinariu, Costica Materials (Basel) Article Coal ash-based geopolymers with mine tailings addition activated with phosphate acid were synthesized for the first time at room temperature. In addition, three types of aluminosilicate sources were used as single raw materials or in a 1/1 wt. ratio to obtain five types of geopolymers activated with H(3)PO(4). The thermal behaviour of the obtained geopolymers was studied between room temperature and 600 °C by Thermogravimetry-Differential Thermal Analysis (TG-DTA) and the phase composition after 28 days of curing at room temperature was analysed by X-ray diffraction (XRD). During heating, the acid-activated geopolymers exhibited similar behaviour to alkali-activated geopolymers. All of the samples showed endothermic peaks up to 300 °C due to water evaporation, while the samples with mine tailings showed two significant exothermic peaks above 400 °C due to oxidation reactions. The phase analysis confirmed the dissolution of the aluminosilicate sources in the presence of H(3)PO(4) by significant changes in the XRD patterns of the raw materials and by the broadening of the peaks because of typically amorphous silicophosphate (Si–P), aluminophosphate (Al–P) or silico-alumino-phosphate (Si–Al–P) formation. The phases resulted from geopolymerisation are berlinite (AlPO(4)), brushite (CaHPO(4)∙2H(2)O), anhydrite (CaSO(4)) or ettringite as AFt and AFm phases. MDPI 2021-12-28 /pmc/articles/PMC8745797/ /pubmed/35009346 http://dx.doi.org/10.3390/ma15010202 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Burduhos Nergis, Dumitru Doru
Vizureanu, Petrica
Sandu, Andrei Victor
Burduhos Nergis, Diana Petronela
Bejinariu, Costica
XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title_full XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title_fullStr XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title_full_unstemmed XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title_short XRD and TG-DTA Study of New Phosphate-Based Geopolymers with Coal Ash or Metakaolin as Aluminosilicate Source and Mine Tailings Addition
title_sort xrd and tg-dta study of new phosphate-based geopolymers with coal ash or metakaolin as aluminosilicate source and mine tailings addition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8745797/
https://www.ncbi.nlm.nih.gov/pubmed/35009346
http://dx.doi.org/10.3390/ma15010202
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