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Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement
The compatibility between crop straw and Portland cement greatly restrict the application of crop straw in cement-based materials. In this study, rice straw fibers with different pretreatments were added to ordinary Portland cement (OPC), and the influence of different rice straw fiber (RF) content...
Autores principales: | , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585209/ https://www.ncbi.nlm.nih.gov/pubmed/34771928 http://dx.doi.org/10.3390/ma14216402 |
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author | Xie, Xiaoli Li, Hongbo |
author_facet | Xie, Xiaoli Li, Hongbo |
author_sort | Xie, Xiaoli |
collection | PubMed |
description | The compatibility between crop straw and Portland cement greatly restrict the application of crop straw in cement-based materials. In this study, rice straw fibers with different pretreatments were added to ordinary Portland cement (OPC), and the influence of different rice straw fiber (RF) content on the hydration process of OPC was measured using calorimeter tests. Additionally, compatibility between RF and OPC was evaluated using the inhibitory index. As a result, steam explosion treatment of rice straw removed most hemicellulose and post-treatment bleaching was used for delignification. As compared with the pure OPC, addition of RF inhibited the hydration of OPC, and the inhibition degree reduced with the increase in pretreatment degree of RF. The inhibitory index grade of different RF filled OPC (RF-OPC) samples is directly related to hemicellulose and lignin content. Compared with lignin, hemicellulose has a greater influence on cement hydration. Without considering the influence of other components, the RF-OPC samples with hemicellulose content of 1.54 wt.% reached the inhibitory index extreme grade, and the hemicellulose content of 2.05 wt.% led to the cessation of cement hydration. The inhibitory index of the samples with 2.05 and 0.85 wt.% lignin content is moderate and low grade, respectively. In addition, the results of XRD patterns and SEM images are consistent with those of heat of hydration. In terms of mechanical properties of cement-based composites with 10 wt.% rice straw fibers, pretreatment of fibers is beneficial to improving the fracture toughness of the samples. |
format | Online Article Text |
id | pubmed-8585209 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-85852092021-11-12 Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement Xie, Xiaoli Li, Hongbo Materials (Basel) Article The compatibility between crop straw and Portland cement greatly restrict the application of crop straw in cement-based materials. In this study, rice straw fibers with different pretreatments were added to ordinary Portland cement (OPC), and the influence of different rice straw fiber (RF) content on the hydration process of OPC was measured using calorimeter tests. Additionally, compatibility between RF and OPC was evaluated using the inhibitory index. As a result, steam explosion treatment of rice straw removed most hemicellulose and post-treatment bleaching was used for delignification. As compared with the pure OPC, addition of RF inhibited the hydration of OPC, and the inhibition degree reduced with the increase in pretreatment degree of RF. The inhibitory index grade of different RF filled OPC (RF-OPC) samples is directly related to hemicellulose and lignin content. Compared with lignin, hemicellulose has a greater influence on cement hydration. Without considering the influence of other components, the RF-OPC samples with hemicellulose content of 1.54 wt.% reached the inhibitory index extreme grade, and the hemicellulose content of 2.05 wt.% led to the cessation of cement hydration. The inhibitory index of the samples with 2.05 and 0.85 wt.% lignin content is moderate and low grade, respectively. In addition, the results of XRD patterns and SEM images are consistent with those of heat of hydration. In terms of mechanical properties of cement-based composites with 10 wt.% rice straw fibers, pretreatment of fibers is beneficial to improving the fracture toughness of the samples. MDPI 2021-10-26 /pmc/articles/PMC8585209/ /pubmed/34771928 http://dx.doi.org/10.3390/ma14216402 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 Xie, Xiaoli Li, Hongbo Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title | Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title_full | Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title_fullStr | Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title_full_unstemmed | Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title_short | Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement |
title_sort | compatibility between rice straw fibers with different pretreatments and ordinary portland cement |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8585209/ https://www.ncbi.nlm.nih.gov/pubmed/34771928 http://dx.doi.org/10.3390/ma14216402 |
work_keys_str_mv | AT xiexiaoli compatibilitybetweenricestrawfiberswithdifferentpretreatmentsandordinaryportlandcement AT lihongbo compatibilitybetweenricestrawfiberswithdifferentpretreatmentsandordinaryportlandcement |