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The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites
This paper experimentally studied the effect of polypropylene (PP) microfibers on thermal and post-heating mechanical behaviors of cementitious composites. Cement mortars with small dosage of polypropylene fibers were prepared, heated at various temperatures (150 °C, 200 °C, 450 °C, and 600 °C), and...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7344851/ https://www.ncbi.nlm.nih.gov/pubmed/32545458 http://dx.doi.org/10.3390/ma13122676 |
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author | Irshidat, Mohammad R. Al-Nuaimi, Nasser Rabie, Mohamed |
author_facet | Irshidat, Mohammad R. Al-Nuaimi, Nasser Rabie, Mohamed |
author_sort | Irshidat, Mohammad R. |
collection | PubMed |
description | This paper experimentally studied the effect of polypropylene (PP) microfibers on thermal and post-heating mechanical behaviors of cementitious composites. Cement mortars with small dosage of polypropylene fibers were prepared, heated at various temperatures (150 °C, 200 °C, 450 °C, and 600 °C), and then tested. The investigated parameters include residual compressive and flexural strengths, elastic modulus, fracture energy, stress intensity factors, failure modes, microstructure (scanning electron microscopy (SEM) imaging), thermal conductivity, heat flow (differential scanning calorimetry (DSC) test), mass loss (thermogravimetric analysis (TGA) test), and chemical composition (XRD analysis). The results showed the efficiency of PP fibers to enhance the post-heating behavior and the residual mechanical properties of cement mortar after heating. The presence of PP fibers did not affect the heat flow and the mass loss of cement mortar at room temperature. However, heating cement mortar at temperature beyond the melting point of the fibers negatively affected its thermal behavior. The presence of PP fibers played a major role in bridging the cracks and mitigating their propagation. Once the melting point of the polypropylene fibers is exceeded, the fibers melted and created extra voids in the microstructure of concrete. |
format | Online Article Text |
id | pubmed-7344851 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-73448512020-07-09 The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites Irshidat, Mohammad R. Al-Nuaimi, Nasser Rabie, Mohamed Materials (Basel) Article This paper experimentally studied the effect of polypropylene (PP) microfibers on thermal and post-heating mechanical behaviors of cementitious composites. Cement mortars with small dosage of polypropylene fibers were prepared, heated at various temperatures (150 °C, 200 °C, 450 °C, and 600 °C), and then tested. The investigated parameters include residual compressive and flexural strengths, elastic modulus, fracture energy, stress intensity factors, failure modes, microstructure (scanning electron microscopy (SEM) imaging), thermal conductivity, heat flow (differential scanning calorimetry (DSC) test), mass loss (thermogravimetric analysis (TGA) test), and chemical composition (XRD analysis). The results showed the efficiency of PP fibers to enhance the post-heating behavior and the residual mechanical properties of cement mortar after heating. The presence of PP fibers did not affect the heat flow and the mass loss of cement mortar at room temperature. However, heating cement mortar at temperature beyond the melting point of the fibers negatively affected its thermal behavior. The presence of PP fibers played a major role in bridging the cracks and mitigating their propagation. Once the melting point of the polypropylene fibers is exceeded, the fibers melted and created extra voids in the microstructure of concrete. MDPI 2020-06-12 /pmc/articles/PMC7344851/ /pubmed/32545458 http://dx.doi.org/10.3390/ma13122676 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 Irshidat, Mohammad R. Al-Nuaimi, Nasser Rabie, Mohamed The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title | The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title_full | The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title_fullStr | The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title_full_unstemmed | The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title_short | The Role of Polypropylene Microfibers in Thermal Properties and Post-Heating Behavior of Cementitious Composites |
title_sort | role of polypropylene microfibers in thermal properties and post-heating behavior of cementitious composites |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7344851/ https://www.ncbi.nlm.nih.gov/pubmed/32545458 http://dx.doi.org/10.3390/ma13122676 |
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