Investigation of Engineering Properties and Solidification Mechanism of Loess by Sodium Silicate Alkali-Activated Coal Gangue Powder

The aim of this study is to investigate the engineering properties and solidification mechanism of loess through the use of alkali-activated coal gangue powder with sodium silicate. Experimental methods and comprehensive analysis were employed to examine the effects of different proportions of alkal...

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Published in:Advances in civil engineering 2024-05, Vol.2024, p.1-9
Main Authors: Yang, Yang, Yu, Shengsheng, Ma, Xiao, Hu, Aiping, Li, Ping
Format: Article
Language:English
Subjects:
Carbon
Cement
Coal
Compressibility
Compressive strength
Curing
Engineering
Experimental methods
Gangue
Geology
Ion exchange
Load
Loess
Ratios
Shear strength
Shear tests
Sodium
Sodium silicates
Solidification
Solids
Test methods
Volcanic ash
Water
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Yu, Shengsheng
Ma, Xiao
Hu, Aiping
Li, Ping
description The aim of this study is to investigate the engineering properties and solidification mechanism of loess through the use of alkali-activated coal gangue powder with sodium silicate. Experimental methods and comprehensive analysis were employed to examine the effects of different proportions of alkali-activated coal gangue powder with sodium silicate on the engineering properties of loess, including mass shrinkage, compressibility, and shear strength. Additionally, scanning electron microscopy was utilized to gain in-depth insights into the interaction and solidification mechanism between loess and alkali-activated coal gangue powder. The results show that the sodium silicate alkali-activated gangue powder curing loess has significantly improved the compressive strength and shear strength of the loess. With a ratio of 7 : 2 : 1, the 28 days compressive strength of solidified loess is 1.7 MPa, and the shear strength is 67.92 kPa, which is 1.91 and 2.13 times the 28 days compressive strength and shear strength of unmixed gangue powder and sodium silicate specimens respectively. The hydration–hydrolysis reaction, ion-exchange reaction, and volcanic ash reaction of the gangue powder under an alkaline environment generated hydrides that filled the pores between soil particles, enhanced the interparticle cohesion, and made the internal structure of the specimens denser, improving the engineering performance of loess solidification. The proposed sodium silicate alkali-activated gangue powder curing loess mechanism can provide a theoretical reference for the engineering application of gangue powder and the curing modification of loess.
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Experimental methods and comprehensive analysis were employed to examine the effects of different proportions of alkali-activated coal gangue powder with sodium silicate on the engineering properties of loess, including mass shrinkage, compressibility, and shear strength. Additionally, scanning electron microscopy was utilized to gain in-depth insights into the interaction and solidification mechanism between loess and alkali-activated coal gangue powder. The results show that the sodium silicate alkali-activated gangue powder curing loess has significantly improved the compressive strength and shear strength of the loess. With a ratio of 7 : 2 : 1, the 28 days compressive strength of solidified loess is 1.7 MPa, and the shear strength is 67.92 kPa, which is 1.91 and 2.13 times the 28 days compressive strength and shear strength of unmixed gangue powder and sodium silicate specimens respectively. The hydration–hydrolysis reaction, ion-exchange reaction, and volcanic ash reaction of the gangue powder under an alkaline environment generated hydrides that filled the pores between soil particles, enhanced the interparticle cohesion, and made the internal structure of the specimens denser, improving the engineering performance of loess solidification. The proposed sodium silicate alkali-activated gangue powder curing loess mechanism can provide a theoretical reference for the engineering application of gangue powder and the curing modification of loess.</description><identifier>ISSN: 1687-8086</identifier><identifier>EISSN: 1687-8094</identifier><identifier>DOI: 10.1155/2024/7718335</identifier><language>eng</language><publisher>New York: Hindawi</publisher><subject>Carbon ; Cement ; Coal ; Compressibility ; Compressive strength ; Curing ; Engineering ; Experimental methods ; Gangue ; Geology ; Ion exchange ; Load ; Loess ; Ratios ; Shear strength ; Shear tests ; Sodium ; Sodium silicates ; Solidification ; Solids ; Test methods ; Volcanic ash ; Water</subject><ispartof>Advances in civil engineering, 2024-05, Vol.2024, p.1-9</ispartof><rights>Copyright © 2024 Yang Yang et al.</rights><rights>Copyright © 2024 Yang Yang et al. This is an open access article distributed under the Creative Commons Attribution License (the “License”), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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The hydration–hydrolysis reaction, ion-exchange reaction, and volcanic ash reaction of the gangue powder under an alkaline environment generated hydrides that filled the pores between soil particles, enhanced the interparticle cohesion, and made the internal structure of the specimens denser, improving the engineering performance of loess solidification. 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subjects Carbon
Cement
Coal
Compressibility
Compressive strength
Curing
Engineering
Experimental methods
Gangue
Geology
Ion exchange
Load
Loess
Ratios
Shear strength
Shear tests
Sodium
Sodium silicates
Solidification
Solids
Test methods
Volcanic ash
Water
title Investigation of Engineering Properties and Solidification Mechanism of Loess by Sodium Silicate Alkali-Activated Coal Gangue Powder
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