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...

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Autores principales:	Xiaoli Xie, Hongbo Li
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	rice straw fibers ordinary Portland cement hydration heat inhibitory index lignin hemicellulose Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
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spelling	oai:doaj.org-article:da95c90734d44cf89afa9368a434ea5c2021-11-11T17:58:52ZCompatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement10.3390/ma142164021996-1944https://doaj.org/article/da95c90734d44cf89afa9368a434ea5c2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6402https://doaj.org/toc/1996-1944The 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.Xiaoli XieHongbo LiMDPI AGarticlerice straw fibersordinary Portland cementhydration heatinhibitory indexligninhemicelluloseTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6402, p 6402 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	rice straw fibers ordinary Portland cement hydration heat inhibitory index lignin hemicellulose Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	rice straw fibers ordinary Portland cement hydration heat inhibitory index lignin hemicellulose Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Xiaoli Xie Hongbo Li Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement
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	article
author	Xiaoli Xie Hongbo Li
author_facet	Xiaoli Xie Hongbo Li
author_sort	Xiaoli Xie
title	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_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_sort	compatibility between rice straw fibers with different pretreatments and ordinary portland cement
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/da95c90734d44cf89afa9368a434ea5c
work_keys_str_mv	AT xiaolixie compatibilitybetweenricestrawfiberswithdifferentpretreatmentsandordinaryportlandcement AT hongboli compatibilitybetweenricestrawfiberswithdifferentpretreatmentsandordinaryportlandcement
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Compatibility between Rice Straw Fibers with Different Pretreatments and Ordinary Portland Cement

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