Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash

Desulfurization ash and fly ash are solid wastes discharged from boilers of power plants. Their utilization rate is low, especially desulfurization ash, most of which is stored. In order to realize their resource utilization, they are used to modify loess in this paper. Nine group compaction tests a...

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Autores principales: Cheng, Zhi, Cheng, Xinrong, Xie, Yuchao, Ma, Zhe, Liu, Yuhao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8779010/
https://www.ncbi.nlm.nih.gov/pubmed/35057235
http://dx.doi.org/10.3390/ma15020512
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author Cheng, Zhi
Cheng, Xinrong
Xie, Yuchao
Ma, Zhe
Liu, Yuhao
author_facet Cheng, Zhi
Cheng, Xinrong
Xie, Yuchao
Ma, Zhe
Liu, Yuhao
author_sort Cheng, Zhi
collection PubMed
description Desulfurization ash and fly ash are solid wastes discharged from boilers of power plants. Their utilization rate is low, especially desulfurization ash, most of which is stored. In order to realize their resource utilization, they are used to modify loess in this paper. Nine group compaction tests and 32 group direct shear tests are done in order to explore the influence law of desulfurization ash and fly ash on the strength of the loess. Meanwhile, FLAC3D software is used to numerically simulate the direct shear test, and the simulation results and the test results are compared and analyzed. The results show that, with the increase of desulfurization ash’s amount, the shear strength of the modified loess increases first and then decreases. The loess modified by the fly ash has the same law with that of the desulfurization ash. The best mass ratio of modified loess is 80:20. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 12.74% higher than that of the pure loess on average and the shear strength of loess modified by fly ash is 3.59% higher than that of the pure loess on average. The effect of the desulfurization ash on modifying the loess is better than that of the fly ash. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 9.15% higher than that of the fly ash on average. Comparing the results of the simulation calculation with the actual test results, the increase rate of the shear stress of the FLAC3D simulation is larger than that of the actual test, and the simulated shear strength is about 8.21% higher than the test shear strength.
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spelling pubmed-87790102022-01-22 Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash Cheng, Zhi Cheng, Xinrong Xie, Yuchao Ma, Zhe Liu, Yuhao Materials (Basel) Article Desulfurization ash and fly ash are solid wastes discharged from boilers of power plants. Their utilization rate is low, especially desulfurization ash, most of which is stored. In order to realize their resource utilization, they are used to modify loess in this paper. Nine group compaction tests and 32 group direct shear tests are done in order to explore the influence law of desulfurization ash and fly ash on the strength of the loess. Meanwhile, FLAC3D software is used to numerically simulate the direct shear test, and the simulation results and the test results are compared and analyzed. The results show that, with the increase of desulfurization ash’s amount, the shear strength of the modified loess increases first and then decreases. The loess modified by the fly ash has the same law with that of the desulfurization ash. The best mass ratio of modified loess is 80:20. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 12.74% higher than that of the pure loess on average and the shear strength of loess modified by fly ash is 3.59% higher than that of the pure loess on average. The effect of the desulfurization ash on modifying the loess is better than that of the fly ash. When the mass ratio is 80:20, the shear strength of loess modified by the desulfurization ash is 9.15% higher than that of the fly ash on average. Comparing the results of the simulation calculation with the actual test results, the increase rate of the shear stress of the FLAC3D simulation is larger than that of the actual test, and the simulated shear strength is about 8.21% higher than the test shear strength. MDPI 2022-01-10 /pmc/articles/PMC8779010/ /pubmed/35057235 http://dx.doi.org/10.3390/ma15020512 Text en © 2022 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
Cheng, Zhi
Cheng, Xinrong
Xie, Yuchao
Ma, Zhe
Liu, Yuhao
Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title_full Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title_fullStr Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title_full_unstemmed Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title_short Strength Tests and Numerical Simulations of Loess Modified by Desulfurization Ash and Fly Ash
title_sort strength tests and numerical simulations of loess modified by desulfurization ash and fly ash
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8779010/
https://www.ncbi.nlm.nih.gov/pubmed/35057235
http://dx.doi.org/10.3390/ma15020512
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