Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates

Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the...

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Autores principales:	Xiaowei Gu, Xiaohui Li, Weifeng Zhang, Yuxin Gao, Yaning Kong, Jianping Liu, Xinlong Zhang
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	HPMC iron tailings workability mechanical properties 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/d65c92bd91ad4dc7ba080bef9039b58b
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spelling	oai:doaj.org-article:d65c92bd91ad4dc7ba080bef9039b58b2021-11-11T18:01:42ZEffects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates10.3390/ma142164511996-1944https://doaj.org/article/d65c92bd91ad4dc7ba080bef9039b58b2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6451https://doaj.org/toc/1996-1944Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the effect of hydroxypropyl methylcellulose (HPMC) on the workability, mechanical properties, and durability of concrete prepared from IOT recycled aggregate was studied. The action mechanism of HPMC on the workability and the mechanical properties of the IOT concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that HPMC can effectively improve the segregation problem caused by the sinking and air entrainment of IOT aggregate and improve the crack resistance of concrete with little effect on its compressive strength and electric flux. These results are due to the air-entraining thickening effect of HPMC, which improves the slurry viscosity, hinders the sinking of aggregate, and improves the workability. At the same time, HPMC film, after concrete hardening, will bridge the slurry and aggregate through physical and chemical effects, hinder the propagation of microcracks, and improve the crack resistance.Xiaowei GuXiaohui LiWeifeng ZhangYuxin GaoYaning KongJianping LiuXinlong ZhangMDPI AGarticleHPMCiron tailingsworkabilitymechanical propertiesTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6451, p 6451 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	HPMC iron tailings workability mechanical properties 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	HPMC iron tailings workability mechanical properties 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 Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
description	Iron ore tailings (IOTs) are gradually used as building materials to solve the severe ecological and environmental problems caused by their massive accumulation. However, the bulk density of IOT as aggregate is too large, which seriously affects the concrete properties. Therefore, in this paper, the effect of hydroxypropyl methylcellulose (HPMC) on the workability, mechanical properties, and durability of concrete prepared from IOT recycled aggregate was studied. The action mechanism of HPMC on the workability and the mechanical properties of the IOT concrete was analyzed by mercury intrusion porosimetry (MIP) and scanning electron microscope (SEM). The results show that HPMC can effectively improve the segregation problem caused by the sinking and air entrainment of IOT aggregate and improve the crack resistance of concrete with little effect on its compressive strength and electric flux. These results are due to the air-entraining thickening effect of HPMC, which improves the slurry viscosity, hinders the sinking of aggregate, and improves the workability. At the same time, HPMC film, after concrete hardening, will bridge the slurry and aggregate through physical and chemical effects, hinder the propagation of microcracks, and improve the crack resistance.
format	article
author	Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang
author_facet	Xiaowei Gu Xiaohui Li Weifeng Zhang Yuxin Gao Yaning Kong Jianping Liu Xinlong Zhang
author_sort	Xiaowei Gu
title	Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
title_short	Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
title_full	Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
title_fullStr	Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
title_full_unstemmed	Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates
title_sort	effects of hpmc on workability and mechanical properties of concrete using iron tailings as aggregates
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d65c92bd91ad4dc7ba080bef9039b58b
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Effects of HPMC on Workability and Mechanical Properties of Concrete Using Iron Tailings as Aggregates

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