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Study on Modification and Mechanism of Construction Waste to Solidified Silt

A large amount of silt may be produced in river and lake regulation. It not only occupies land but also pollutes the environment. Therefore, it is urgent to seek effective disposal and utilization methods. Based on the problems of poor stability of stabilized soil and its tendency to soften easily i...

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Autores principales: Shi, Yannan, Weng, Haoxuan, Yu, Jiongqi, Gong, Yongfan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095643/
https://www.ncbi.nlm.nih.gov/pubmed/37049074
http://dx.doi.org/10.3390/ma16072780
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author Shi, Yannan
Weng, Haoxuan
Yu, Jiongqi
Gong, Yongfan
author_facet Shi, Yannan
Weng, Haoxuan
Yu, Jiongqi
Gong, Yongfan
author_sort Shi, Yannan
collection PubMed
description A large amount of silt may be produced in river and lake regulation. It not only occupies land but also pollutes the environment. Therefore, it is urgent to seek effective disposal and utilization methods. Based on the problems of poor stability of stabilized soil and its tendency to soften easily in water, as well as its low strength with low curing agent dosage, this paper proposes a method to improve stabilized soil’s solidification effect by adding materials such as cement, lime, fly ash, triethanolamine, sodium hydroxide, sodium silicate, etc., while mixing different grain diameters and quantities of building waste materials and ordinary sand. Using construction waste and ordinary sand as a comparative test, the curing mechanism of construction waste debris on the mechanical properties, permeability, and microstructure of solidified sludge was studied through unconfined compression tests, dry and wet cycle tests, permeability tests, and micro-structure tests such as XRD, MIP, and SEM. The test results show that the strength increases 8.5%~72.1% by adding building waste materials, and it grew with the increase in particle size and amount. It reduced the content of large pore size of solidified sediment and optimized the internal pore structure. At the same time, it formed a new structure filled by rigid skeleton material. Thus, it improved its unit section stress, built up the curing effect and water stability. The findings of this study can be used to modify solidified silt to improve stability and compaction characteristics.
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spelling pubmed-100956432023-04-13 Study on Modification and Mechanism of Construction Waste to Solidified Silt Shi, Yannan Weng, Haoxuan Yu, Jiongqi Gong, Yongfan Materials (Basel) Article A large amount of silt may be produced in river and lake regulation. It not only occupies land but also pollutes the environment. Therefore, it is urgent to seek effective disposal and utilization methods. Based on the problems of poor stability of stabilized soil and its tendency to soften easily in water, as well as its low strength with low curing agent dosage, this paper proposes a method to improve stabilized soil’s solidification effect by adding materials such as cement, lime, fly ash, triethanolamine, sodium hydroxide, sodium silicate, etc., while mixing different grain diameters and quantities of building waste materials and ordinary sand. Using construction waste and ordinary sand as a comparative test, the curing mechanism of construction waste debris on the mechanical properties, permeability, and microstructure of solidified sludge was studied through unconfined compression tests, dry and wet cycle tests, permeability tests, and micro-structure tests such as XRD, MIP, and SEM. The test results show that the strength increases 8.5%~72.1% by adding building waste materials, and it grew with the increase in particle size and amount. It reduced the content of large pore size of solidified sediment and optimized the internal pore structure. At the same time, it formed a new structure filled by rigid skeleton material. Thus, it improved its unit section stress, built up the curing effect and water stability. The findings of this study can be used to modify solidified silt to improve stability and compaction characteristics. MDPI 2023-03-30 /pmc/articles/PMC10095643/ /pubmed/37049074 http://dx.doi.org/10.3390/ma16072780 Text en © 2023 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
Shi, Yannan
Weng, Haoxuan
Yu, Jiongqi
Gong, Yongfan
Study on Modification and Mechanism of Construction Waste to Solidified Silt
title Study on Modification and Mechanism of Construction Waste to Solidified Silt
title_full Study on Modification and Mechanism of Construction Waste to Solidified Silt
title_fullStr Study on Modification and Mechanism of Construction Waste to Solidified Silt
title_full_unstemmed Study on Modification and Mechanism of Construction Waste to Solidified Silt
title_short Study on Modification and Mechanism of Construction Waste to Solidified Silt
title_sort study on modification and mechanism of construction waste to solidified silt
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10095643/
https://www.ncbi.nlm.nih.gov/pubmed/37049074
http://dx.doi.org/10.3390/ma16072780
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