Microstructure, strength and durability of nano-cemented soils under different seawater conditions: laboratory study

Chen, Q; Yu, R; Gaoliang, T; Nimbalkar, S

Microstructure, strength and durability of nano-cemented soils under different seawater conditions: laboratory study

Chen, Q Yu, R Gaoliang, T Nimbalkar, S

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Publisher:: SPRINGER HEIDELBERG
Publication Type:: Journal Article
Citation:: Acta Geotechnica, 2023, 18, (3), pp. 1607-1627
Issue Date:: 2023-03-01

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Field	Value	Language
dc.contributor.author	Chen, Q
dc.contributor.author	Yu, R
dc.contributor.author	Gaoliang, T
dc.contributor.author	Nimbalkar, S https://orcid.org/0000-0002-1538-3396
dc.date.accessioned	2023-05-06T06:42:45Z
dc.date.available	2023-05-06T06:42:45Z
dc.date.issued	2023-03-01
dc.identifier.citation	Acta Geotechnica, 2023, 18, (3), pp. 1607-1627
dc.identifier.issn	1861-1125
dc.identifier.issn	1861-1133
dc.identifier.uri	http://hdl.handle.net/10453/170242
dc.description.abstract	Cemented soils are subjected to a variety of adverse environmental conditions in the marine environment, including corrosive seawater exposure, the dry–wet cycle, and temperature variations. These environmental conditions significantly jeopardize the reliability and durability of foundations built on these types of engineered soil. The addition of nanoparticles to this cement treated soils is offered as an engineering solution for extending their service life. Four different nanomaterials that have been extensively studied in the literature are employed as admixtures in the cemented soil. Appropriate dosages of these nanomaterials are determined based on the data from unconfined compressive strength test (UCS) and the scanning electron microscopy (SEM). Wet–dry cycles are applied on the cement treated soil samples to simulate the tidal rise and fall relevant to the marine environment. Nuclear magnetic resonance tests (NMR) are also performed to complement the SEM study. Incorporating Nano-SiO2 into soft soil cured with cement in marine environment improved the mechanical strength and stiffness of the cement soils. It also decayed the corrosion rate of the cemented soils in ocean, and the improvement in mechanical stability was also quite remarkable. After 60 cycles of seawater exposure, the strength of Nano-SiO2 cement soils increased by 3.4 times that of conventional cemented soils, while the corrosion rate decreased by 85%. The improved durability of Nano-SiO2 cemented soils is a function of their structural filling tropism and distribution tropisms. The improved durability of Nano-SiO2 is a result of the combined effect of particle effect, volcanic ash effect and nucleation effect.
dc.language	English
dc.publisher	SPRINGER HEIDELBERG
dc.relation.ispartof	Acta Geotechnica
dc.relation.isbasedon	10.1007/s11440-022-01688-1
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Microstructure, strength and durability of nano-cemented soils under different seawater conditions: laboratory study
dc.type	Journal Article
utslib.citation.volume	18
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
dc.date.updated	2023-05-06T06:42:43Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	18
utslib.citation.issue	3

Abstract:

Cemented soils are subjected to a variety of adverse environmental conditions in the marine environment, including corrosive seawater exposure, the dry–wet cycle, and temperature variations. These environmental conditions significantly jeopardize the reliability and durability of foundations built on these types of engineered soil. The addition of nanoparticles to this cement treated soils is offered as an engineering solution for extending their service life. Four different nanomaterials that have been extensively studied in the literature are employed as admixtures in the cemented soil. Appropriate dosages of these nanomaterials are determined based on the data from unconfined compressive strength test (UCS) and the scanning electron microscopy (SEM). Wet–dry cycles are applied on the cement treated soil samples to simulate the tidal rise and fall relevant to the marine environment. Nuclear magnetic resonance tests (NMR) are also performed to complement the SEM study. Incorporating Nano-SiO2 into soft soil cured with cement in marine environment improved the mechanical strength and stiffness of the cement soils. It also decayed the corrosion rate of the cemented soils in ocean, and the improvement in mechanical stability was also quite remarkable. After 60 cycles of seawater exposure, the strength of Nano-SiO2 cement soils increased by 3.4 times that of conventional cemented soils, while the corrosion rate decreased by 85%. The improved durability of Nano-SiO2 cemented soils is a function of their structural filling tropism and distribution tropisms. The improved durability of Nano-SiO2 is a result of the combined effect of particle effect, volcanic ash effect and nucleation effect.

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http://hdl.handle.net/10453/170242