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Study on the Performance and Mechanisms of High-Performance Foamed Concrete

As a common building insulation material, foamed concrete has been widely used in engineering practice. However, the contradiction between compressive strength and thermal conductivity has become the main problem limiting the development and application of foamed concrete. Therefore, high-performanc...

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Autores principales: Xian, Guodong, Liu, Zhe, Wang, Zhen, Zhou, Xuejun
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9696265/
https://www.ncbi.nlm.nih.gov/pubmed/36431380
http://dx.doi.org/10.3390/ma15227894
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author Xian, Guodong
Liu, Zhe
Wang, Zhen
Zhou, Xuejun
author_facet Xian, Guodong
Liu, Zhe
Wang, Zhen
Zhou, Xuejun
author_sort Xian, Guodong
collection PubMed
description As a common building insulation material, foamed concrete has been widely used in engineering practice. However, the contradiction between compressive strength and thermal conductivity has become the main problem limiting the development and application of foamed concrete. Therefore, high-performance foam concrete (HPFC) with high compressive strength and low thermal conductivity was prepared by using graphene oxide (GO), fly ash, and polypropylene (PP) fiber as the main admixtures, and taking compressive strength, thermal conductivity, and microstructure as the main indices. Scanning electron microscopy, X-ray diffraction (XRD), and thermogravimetry–differential scanning calorimetry (TG-DSC) were employed to examine the mechanisms of HPFC. The results showed that when the content of fly ash was 25–35 wt%, PP fiber was 0.2–0.4 wt%, and GO was 0.02–0.03 wt%, the FC’s compressive strength increased by up to 38%, and its thermal conductivity reduced by up to 3.4%. Fly ash improved the FC’s performance mainly through filling, pozzolanic activity, and slurry fluidity. PP fiber enhanced the performance of FC mainly through bridging cracks and skeletal effects. The addition of GO had no significant impact on the type, quantity, or hydration reaction rate of the hydration products in these cement-based materials, and mainly improved the FC’s microstructural compactness through template action and crack resistance, thereby improving its performance.
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spelling pubmed-96962652022-11-26 Study on the Performance and Mechanisms of High-Performance Foamed Concrete Xian, Guodong Liu, Zhe Wang, Zhen Zhou, Xuejun Materials (Basel) Article As a common building insulation material, foamed concrete has been widely used in engineering practice. However, the contradiction between compressive strength and thermal conductivity has become the main problem limiting the development and application of foamed concrete. Therefore, high-performance foam concrete (HPFC) with high compressive strength and low thermal conductivity was prepared by using graphene oxide (GO), fly ash, and polypropylene (PP) fiber as the main admixtures, and taking compressive strength, thermal conductivity, and microstructure as the main indices. Scanning electron microscopy, X-ray diffraction (XRD), and thermogravimetry–differential scanning calorimetry (TG-DSC) were employed to examine the mechanisms of HPFC. The results showed that when the content of fly ash was 25–35 wt%, PP fiber was 0.2–0.4 wt%, and GO was 0.02–0.03 wt%, the FC’s compressive strength increased by up to 38%, and its thermal conductivity reduced by up to 3.4%. Fly ash improved the FC’s performance mainly through filling, pozzolanic activity, and slurry fluidity. PP fiber enhanced the performance of FC mainly through bridging cracks and skeletal effects. The addition of GO had no significant impact on the type, quantity, or hydration reaction rate of the hydration products in these cement-based materials, and mainly improved the FC’s microstructural compactness through template action and crack resistance, thereby improving its performance. MDPI 2022-11-08 /pmc/articles/PMC9696265/ /pubmed/36431380 http://dx.doi.org/10.3390/ma15227894 Text en © 2022 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
Xian, Guodong
Liu, Zhe
Wang, Zhen
Zhou, Xuejun
Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title_full Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title_fullStr Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title_full_unstemmed Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title_short Study on the Performance and Mechanisms of High-Performance Foamed Concrete
title_sort study on the performance and mechanisms of high-performance foamed concrete
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9696265/
https://www.ncbi.nlm.nih.gov/pubmed/36431380
http://dx.doi.org/10.3390/ma15227894
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