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Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin

In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75, and 100 wt.% substitution) for the...

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Autores principales: Bonet-Martínez, Eduardo, García-Cobo, Pedro, Pérez-Villarejo, Luis, Castro, Eulogio, Eliche-Quesada, Dolores
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078640/
https://www.ncbi.nlm.nih.gov/pubmed/32085448
http://dx.doi.org/10.3390/ma13040901
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author Bonet-Martínez, Eduardo
García-Cobo, Pedro
Pérez-Villarejo, Luis
Castro, Eulogio
Eliche-Quesada, Dolores
author_facet Bonet-Martínez, Eduardo
García-Cobo, Pedro
Pérez-Villarejo, Luis
Castro, Eulogio
Eliche-Quesada, Dolores
author_sort Bonet-Martínez, Eduardo
collection PubMed
description In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75, and 100 wt.% substitution) for the synthesis of geopolymers. As alkaline activator an 8 M NaOH solution and a Na(2)SiO(3) have been used. The geopolymers were cured 24 h in a climatic chamber at 60 °C in a water-saturated atmosphere, subsequently demoulded and cured at room temperature for 28 days. The results indicated that the incorporation of OPBA waste, which have 19.7 wt.% of Ca, modifies the characteristics of the products formed after alkaline activation. In general terms, the incorporation of increasing amounts of calcium-rich ashes results in geopolymers with higher bulk density. The compressive strength increases with the addition of up to 50 wt.% of OPBA with respect to the control geopolymers, contributing the composition of the residue to the acquisition of better mechanical behavior. The results indicate the potential use of these OPBA waste as raw material to produce unconventional cements with 28-day curing strengths greater than 10 MPa, and thermal conductivities less than 0.35 W/mK.
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spelling pubmed-70786402020-04-21 Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin Bonet-Martínez, Eduardo García-Cobo, Pedro Pérez-Villarejo, Luis Castro, Eulogio Eliche-Quesada, Dolores Materials (Basel) Article In this research, the feasibility of using bottom ashes generated by the combustion of biomass (olive pruning and pine pruning) as a source of aluminosilicates (OPBA) has been studied, replacing the metakaolin precursor (MK) in different proportions (0, 25, 50, 75, and 100 wt.% substitution) for the synthesis of geopolymers. As alkaline activator an 8 M NaOH solution and a Na(2)SiO(3) have been used. The geopolymers were cured 24 h in a climatic chamber at 60 °C in a water-saturated atmosphere, subsequently demoulded and cured at room temperature for 28 days. The results indicated that the incorporation of OPBA waste, which have 19.7 wt.% of Ca, modifies the characteristics of the products formed after alkaline activation. In general terms, the incorporation of increasing amounts of calcium-rich ashes results in geopolymers with higher bulk density. The compressive strength increases with the addition of up to 50 wt.% of OPBA with respect to the control geopolymers, contributing the composition of the residue to the acquisition of better mechanical behavior. The results indicate the potential use of these OPBA waste as raw material to produce unconventional cements with 28-day curing strengths greater than 10 MPa, and thermal conductivities less than 0.35 W/mK. MDPI 2020-02-18 /pmc/articles/PMC7078640/ /pubmed/32085448 http://dx.doi.org/10.3390/ma13040901 Text en © 2020 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bonet-Martínez, Eduardo
García-Cobo, Pedro
Pérez-Villarejo, Luis
Castro, Eulogio
Eliche-Quesada, Dolores
Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title_full Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title_fullStr Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title_full_unstemmed Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title_short Effect of Olive-Pine Bottom Ash on Properties of Geopolymers Based on Metakaolin
title_sort effect of olive-pine bottom ash on properties of geopolymers based on metakaolin
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7078640/
https://www.ncbi.nlm.nih.gov/pubmed/32085448
http://dx.doi.org/10.3390/ma13040901
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