Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials

The durability against wet-dry (w-d) cycles is an important parameter for the service life design of solidified permeable reactive barrier (PRB) waste. This study introduces the potential use of cement, fly ash, and carbide slag (CFC) for the stabilization/solidification (S/S) of PRB waste. In this...

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Autores principales:	Xuan Chen, Wenkui Feng, Hao Wen, Wei Duan, Chongxian Suo, Mingxing Xie, Xiaoqiang Dong
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	PRB waste wet-dry cycle unconfined compressive strength initial resistivity leaching characteristics microstructural characteristics 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:ef1c02bab3934c64976e9e0a491b0b392021-11-25T18:15:28ZStudy on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials10.3390/ma142269851996-1944https://doaj.org/article/ef1c02bab3934c64976e9e0a491b0b392021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/6985https://doaj.org/toc/1996-1944The durability against wet-dry (w-d) cycles is an important parameter for the service life design of solidified permeable reactive barrier (PRB) waste. This study introduces the potential use of cement, fly ash, and carbide slag (CFC) for the stabilization/solidification (S/S) of PRB waste. In this study, solidified PRB waste was subjected to different w-d cycles ranging in times from 0 to 10. By analyzing the mass loss, the unconfined compressive strength (UCS), initial resistivity (IR), and the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> leaching concentration under different durability conditions, the results demonstrate that these variables increased and then tended to decrease with the number of w-d cycles. The UCS of contaminated soil is significantly correlated with IR. Moreover, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analyses indicate that the hydration products calcium silicate hydrate (C-S-H) and ettringite (AFt) are the main reasons for the enhancement of the UCS. However, the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> concentration leads to a decrease in hydration products and the compactness of solidified soil, which has negative effects for the UCS and the leaching ion concentration. In general, the durability exhibited by the PRB waste treated with S/S in this paper was satisfactory. This study can provide theoretical guidance for practical engineering applications.Xuan ChenWenkui FengHao WenWei DuanChongxian SuoMingxing XieXiaoqiang DongMDPI AGarticlePRB wastewet-dry cycleunconfined compressive strengthinitial resistivityleaching characteristicsmicrostructural characteristicsTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6985, p 6985 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	PRB waste wet-dry cycle unconfined compressive strength initial resistivity leaching characteristics microstructural characteristics 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	PRB waste wet-dry cycle unconfined compressive strength initial resistivity leaching characteristics microstructural characteristics 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 Xuan Chen Wenkui Feng Hao Wen Wei Duan Chongxian Suo Mingxing Xie Xiaoqiang Dong Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
description	The durability against wet-dry (w-d) cycles is an important parameter for the service life design of solidified permeable reactive barrier (PRB) waste. This study introduces the potential use of cement, fly ash, and carbide slag (CFC) for the stabilization/solidification (S/S) of PRB waste. In this study, solidified PRB waste was subjected to different w-d cycles ranging in times from 0 to 10. By analyzing the mass loss, the unconfined compressive strength (UCS), initial resistivity (IR), and the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> leaching concentration under different durability conditions, the results demonstrate that these variables increased and then tended to decrease with the number of w-d cycles. The UCS of contaminated soil is significantly correlated with IR. Moreover, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analyses indicate that the hydration products calcium silicate hydrate (C-S-H) and ettringite (AFt) are the main reasons for the enhancement of the UCS. However, the increase in <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>Mn</mi><mrow><mn>2</mn><mo>+</mo></mrow></msup></semantics></math></inline-formula> concentration leads to a decrease in hydration products and the compactness of solidified soil, which has negative effects for the UCS and the leaching ion concentration. In general, the durability exhibited by the PRB waste treated with S/S in this paper was satisfactory. This study can provide theoretical guidance for practical engineering applications.
format	article
author	Xuan Chen Wenkui Feng Hao Wen Wei Duan Chongxian Suo Mingxing Xie Xiaoqiang Dong
author_facet	Xuan Chen Wenkui Feng Hao Wen Wei Duan Chongxian Suo Mingxing Xie Xiaoqiang Dong
author_sort	Xuan Chen
title	Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
title_short	Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
title_full	Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
title_fullStr	Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
title_full_unstemmed	Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials
title_sort	study on the mechanical and leaching characteristics of permeable reactive barrier waste solidified by cement-based materials
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ef1c02bab3934c64976e9e0a491b0b39
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_version_	1718411474544623616

Study on the Mechanical and Leaching Characteristics of Permeable Reactive Barrier Waste Solidified by Cement-Based Materials

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