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The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil

Adding a curing agent can enhance the mechanical properties of soil including its compressive strength. However, few studies have quantitatively analyzed the compressive strength and microstructure of soils to explore the impact of changes in the microstructure on compressive strength. In addition,...

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Autores principales: Yang, Shuai, Liu, Wenbai
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6766202/
https://www.ncbi.nlm.nih.gov/pubmed/31510034
http://dx.doi.org/10.3390/ma12182925
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author Yang, Shuai
Liu, Wenbai
author_facet Yang, Shuai
Liu, Wenbai
author_sort Yang, Shuai
collection PubMed
description Adding a curing agent can enhance the mechanical properties of soil including its compressive strength. However, few studies have quantitatively analyzed the compressive strength and microstructure of soils to explore the impact of changes in the microstructure on compressive strength. In addition, the cost of curing agents is too high to be widely used. In this study, curing agents with different proportions of fly ash were added to dredger fill to reduce the amount of curing agents needed. The quantitative analysis of the relationships between the modulus of compression Es and microstructures of stabilized soil samples is presented. The modulus of compression Es was gauged from compression tests. Microscopic images acquired using a scanning electron microscope were processed using the Image-Pro Plus (IPP) image processing software. The microscopic parameters, obtained using IPP, included the average equivalent particle size Dp, the average equivalent aperture size Db, and the plane pore ratio e. This research demonstrated that the fly ash added to the curing agent achieved the same effect as the curing agent, and the amount of curing agent required was reduced. Therefore, the modulus of compression for stabilized soil can be improved. This is due to the hydration products (i.e., calcium silicate hydrate, calcium hydroxide, and ettringite), produced by the hydration reaction, and which adhere to the surface of the particles and fill the spaces among them. Thus, the change in the pore structure and the compactness of the particles helps to increase the modulus of compression. In addition, there was a good linear relationship between the modulus of compression and the microscopic parameters. Using the mathematical relationships between the macroscopic and microscopic parameters, correlations can be built for macro–microscopic research.
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spelling pubmed-67662022019-09-30 The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil Yang, Shuai Liu, Wenbai Materials (Basel) Article Adding a curing agent can enhance the mechanical properties of soil including its compressive strength. However, few studies have quantitatively analyzed the compressive strength and microstructure of soils to explore the impact of changes in the microstructure on compressive strength. In addition, the cost of curing agents is too high to be widely used. In this study, curing agents with different proportions of fly ash were added to dredger fill to reduce the amount of curing agents needed. The quantitative analysis of the relationships between the modulus of compression Es and microstructures of stabilized soil samples is presented. The modulus of compression Es was gauged from compression tests. Microscopic images acquired using a scanning electron microscope were processed using the Image-Pro Plus (IPP) image processing software. The microscopic parameters, obtained using IPP, included the average equivalent particle size Dp, the average equivalent aperture size Db, and the plane pore ratio e. This research demonstrated that the fly ash added to the curing agent achieved the same effect as the curing agent, and the amount of curing agent required was reduced. Therefore, the modulus of compression for stabilized soil can be improved. This is due to the hydration products (i.e., calcium silicate hydrate, calcium hydroxide, and ettringite), produced by the hydration reaction, and which adhere to the surface of the particles and fill the spaces among them. Thus, the change in the pore structure and the compactness of the particles helps to increase the modulus of compression. In addition, there was a good linear relationship between the modulus of compression and the microscopic parameters. Using the mathematical relationships between the macroscopic and microscopic parameters, correlations can be built for macro–microscopic research. MDPI 2019-09-10 /pmc/articles/PMC6766202/ /pubmed/31510034 http://dx.doi.org/10.3390/ma12182925 Text en © 2019 by the authors. 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 (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yang, Shuai
Liu, Wenbai
The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title_full The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title_fullStr The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title_full_unstemmed The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title_short The Effect of Changing Fly Ash Content on the Modulus of Compression of Stabilized Soil
title_sort effect of changing fly ash content on the modulus of compression of stabilized soil
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6766202/
https://www.ncbi.nlm.nih.gov/pubmed/31510034
http://dx.doi.org/10.3390/ma12182925
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