Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle tes...

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Autores principales:	Fan Xu, Tao Li, Chenghua Li, Zhijun Li, Sheliang Wang, Nan Zhao
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	polypropylene fibers tailing recycled aggregate concrete stress-strain curve compressive behavior freeze–thaw microstructure 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
Acceso en línea:	https://doaj.org/article/5255da01b6504cdbb7e414893962d3d4
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spelling	oai:doaj.org-article:5255da01b6504cdbb7e414893962d3d42021-11-11T18:12:28ZCompressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition10.3390/ma142167121996-1944https://doaj.org/article/5255da01b6504cdbb7e414893962d3d42021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6712https://doaj.org/toc/1996-1944To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle test. The results indicated that PPF had a beneficial impact on reducing the brittleness of TRAC. With the increase in PPF content, the peak strain increased, the elastic modulus decreased, and the peak stress and energy absorption capacity increased at first and then decreased. Furthermore, the microstructure investigation revealed that the interface friction between the PPF, aggregate, and cement matrix was the main source of energy dissipation. When the load acted on the concrete, the stress was dispersed to the fiber monofilaments, thus effectively enhancing the peak stress and peak strain of concrete and suppressing the generation and development of cracks in the concrete. In terms of freeze–thaw resistance, adding a small amount of PPF could reduce the negative effects of the freeze–thaw process on the cement matrix. On the premise of ensuring strength, the waste utilization should be as high as possible. Therefore, it was suggested that the content of PPF in fiber-reinforced tailings recycled aggregate concrete (TRAC-PP) should be 0.6%.Fan XuTao LiChenghua LiZhijun LiSheliang WangNan ZhaoMDPI AGarticlepolypropylene fiberstailing recycled aggregate concretestress-strain curvecompressive behaviorfreeze–thawmicrostructureTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6712, p 6712 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	polypropylene fibers tailing recycled aggregate concrete stress-strain curve compressive behavior freeze–thaw microstructure 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	polypropylene fibers tailing recycled aggregate concrete stress-strain curve compressive behavior freeze–thaw microstructure 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 Fan Xu Tao Li Chenghua Li Zhijun Li Sheliang Wang Nan Zhao Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
description	To improve the high brittleness of recycled aggregate concrete containing iron ore tailings (TRAC), the feasibility of adding polypropylene fiber (PPF) to TRAC was studied by performing a compression stress–strain curve test, scanning electron microscope characterization, and a freeze–thaw cycle test. The results indicated that PPF had a beneficial impact on reducing the brittleness of TRAC. With the increase in PPF content, the peak strain increased, the elastic modulus decreased, and the peak stress and energy absorption capacity increased at first and then decreased. Furthermore, the microstructure investigation revealed that the interface friction between the PPF, aggregate, and cement matrix was the main source of energy dissipation. When the load acted on the concrete, the stress was dispersed to the fiber monofilaments, thus effectively enhancing the peak stress and peak strain of concrete and suppressing the generation and development of cracks in the concrete. In terms of freeze–thaw resistance, adding a small amount of PPF could reduce the negative effects of the freeze–thaw process on the cement matrix. On the premise of ensuring strength, the waste utilization should be as high as possible. Therefore, it was suggested that the content of PPF in fiber-reinforced tailings recycled aggregate concrete (TRAC-PP) should be 0.6%.
format	article
author	Fan Xu Tao Li Chenghua Li Zhijun Li Sheliang Wang Nan Zhao
author_facet	Fan Xu Tao Li Chenghua Li Zhijun Li Sheliang Wang Nan Zhao
author_sort	Fan Xu
title	Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
title_short	Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
title_full	Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
title_fullStr	Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
title_full_unstemmed	Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition
title_sort	compressive behavior, microstructural properties, and freeze–thaw behavior of tailing recycled aggregate concrete with waste polypropylene fiber addition
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5255da01b6504cdbb7e414893962d3d4
work_keys_str_mv	AT fanxu compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition AT taoli compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition AT chenghuali compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition AT zhijunli compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition AT sheliangwang compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition AT nanzhao compressivebehaviormicrostructuralpropertiesandfreezethawbehavioroftailingrecycledaggregateconcretewithwastepolypropylenefiberaddition
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Compressive Behavior, Microstructural Properties, and Freeze–Thaw Behavior of Tailing Recycled Aggregate Concrete with Waste Polypropylene Fiber Addition

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