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Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites

Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of ceme...

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Detalles Bibliográficos
Autores principales: Zhou, Shuai, Jia, Yue, Wang, Chong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7765322/
https://www.ncbi.nlm.nih.gov/pubmed/33333897
http://dx.doi.org/10.3390/polym12122990
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author Zhou, Shuai
Jia, Yue
Wang, Chong
author_facet Zhou, Shuai
Jia, Yue
Wang, Chong
author_sort Zhou, Shuai
collection PubMed
description Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of cementitious composites before self-healing happens. The reduction of effective elastic properties can be evaluated by micromechanics. The substantial complicacy included in micromechanical models leads to the need of specifying a large number of parameters and inputs. Meanwhile, there are nonlinearities in input–output relationships. Hence, it is a prerequisite to know the sensitivity of the models. A micromechanical model which can evaluate the effective properties of the microcapsule-contained cementitious material is proposed. Subsequently, a quantitative global sensitivity analysis technique, the Extended Fourier Amplitude Sensitivity Test (EFAST), is applied to identify which parameters are required for knowledge improvement to achieve the desired level of confidence in the results. Sensitivity indices for first-order effects are computed. Results show the volume fraction of microcapsules is the most important factor which influences the effective properties of self-healing cementitious composites before self-healing. The influence of interfacial properties cannot be neglected. The research sheds new light on the influence of parameters on microcapsule-contained self-healing composites.
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spelling pubmed-77653222020-12-27 Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites Zhou, Shuai Jia, Yue Wang, Chong Polymers (Basel) Article Cementitious composites with microencapsulated healing agents are appealing due to the advantages of self-healing. The polymeric shell and polymeric healing agents in microcapsules have been proven effective in self-healing, while these microcapsules decrease the effective elastic properties of cementitious composites before self-healing happens. The reduction of effective elastic properties can be evaluated by micromechanics. The substantial complicacy included in micromechanical models leads to the need of specifying a large number of parameters and inputs. Meanwhile, there are nonlinearities in input–output relationships. Hence, it is a prerequisite to know the sensitivity of the models. A micromechanical model which can evaluate the effective properties of the microcapsule-contained cementitious material is proposed. Subsequently, a quantitative global sensitivity analysis technique, the Extended Fourier Amplitude Sensitivity Test (EFAST), is applied to identify which parameters are required for knowledge improvement to achieve the desired level of confidence in the results. Sensitivity indices for first-order effects are computed. Results show the volume fraction of microcapsules is the most important factor which influences the effective properties of self-healing cementitious composites before self-healing. The influence of interfacial properties cannot be neglected. The research sheds new light on the influence of parameters on microcapsule-contained self-healing composites. MDPI 2020-12-15 /pmc/articles/PMC7765322/ /pubmed/33333897 http://dx.doi.org/10.3390/polym12122990 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
Zhou, Shuai
Jia, Yue
Wang, Chong
Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title_full Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title_fullStr Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title_full_unstemmed Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title_short Global Sensitivity Analysis for the Polymeric Microcapsules in Self-Healing Cementitious Composites
title_sort global sensitivity analysis for the polymeric microcapsules in self-healing cementitious composites
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7765322/
https://www.ncbi.nlm.nih.gov/pubmed/33333897
http://dx.doi.org/10.3390/polym12122990
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