Cyclic stress-strain characteristics of calcareous sand improved by polyurethane foam adhesive

Chen, Q; Yu, R; Li, Y; Tao, G; Nimbalkar, S

Cyclic stress-strain characteristics of calcareous sand improved by polyurethane foam adhesive

Chen, Q Yu, R Li, Y Tao, G Nimbalkar, S

Permalink

Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Transportation Geotechnics, 2021, 31
Issue Date:: 2021-11-01

Closed Access

	Filename	Description	Size
	1-s2.0-S2214391221001306-main.pdf	Published version	12.29 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Chen, Q
dc.contributor.author	Yu, R
dc.contributor.author	Li, Y
dc.contributor.author	Tao, G
dc.contributor.author	Nimbalkar, S https://orcid.org/0000-0002-1538-3396
dc.date.accessioned	2022-04-11T00:41:20Z
dc.date.available	2022-04-11T00:41:20Z
dc.date.issued	2021-11-01
dc.identifier.citation	Transportation Geotechnics, 2021, 31
dc.identifier.issn	2214-3912
dc.identifier.issn	2214-3912
dc.identifier.uri	http://hdl.handle.net/10453/156042
dc.description.abstract	Calcareous sand is a common foundation soil which is usually used for offshore or island infrastructures such as highway embankments and airport runways. These structures are often subjected to cyclic loads (such as waves, traffic, pipeline driving, and earthquakes). However, particle breakage commonly occurs in calcareous sands, which has posed a great challenge to offshore structures in terms of increased differential settlements. To address this issue, an eco-friendly agent, i.e., Polyurethane Foam Adhesive (PFA), instead of the commonly used alkaline stabilization agents (e.g. lime, cement), was proposed to improve the engineering properties of calcareous sands. The PFA is a rigid foam consisting of Isocyanate and polymer Polyol. To examine the effectiveness of using PFA in improving the resilient properties of calcareous sands, a series of triaxial shear tests were performed using a medium-scale true triaxial apparatus equipped with a cyclic loading facility. Besides, scanning electron microscope (SEM) tests were conducted to reveal a microstructural mechanism of using PFA for improving calcareous sand. The experimental results provided crucial insights into the cyclic strength, resilient modulus Mr, equivalent damping ratio λ of modified calcareous sand for a range of PFA contents Rw and confining pressures σ3, as well as the mechanism of PFA solidified calcareous sand from a microscopic point of view. Useful empirical relationships among the governing parameters were established. A high-resolution field emission scanning electron microscope was used to study the internal pore and particles arrangement of PFA modified specimen. The experimental findings are crucial for improving the understanding of the fragility of calcareous sand and their improvement using an eco-friendly solution in the form of PFA.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Transportation Geotechnics
dc.relation.isbasedon	10.1016/j.trgeo.2021.100640
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering
dc.title	Cyclic stress-strain characteristics of calcareous sand improved by polyurethane foam adhesive
dc.type	Journal Article
utslib.citation.volume	31
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	2022-04-11T00:41:12Z
pubs.publication-status	Published
pubs.volume	31

Abstract:

Calcareous sand is a common foundation soil which is usually used for offshore or island infrastructures such as highway embankments and airport runways. These structures are often subjected to cyclic loads (such as waves, traffic, pipeline driving, and earthquakes). However, particle breakage commonly occurs in calcareous sands, which has posed a great challenge to offshore structures in terms of increased differential settlements. To address this issue, an eco-friendly agent, i.e., Polyurethane Foam Adhesive (PFA), instead of the commonly used alkaline stabilization agents (e.g. lime, cement), was proposed to improve the engineering properties of calcareous sands. The PFA is a rigid foam consisting of Isocyanate and polymer Polyol. To examine the effectiveness of using PFA in improving the resilient properties of calcareous sands, a series of triaxial shear tests were performed using a medium-scale true triaxial apparatus equipped with a cyclic loading facility. Besides, scanning electron microscope (SEM) tests were conducted to reveal a microstructural mechanism of using PFA for improving calcareous sand. The experimental results provided crucial insights into the cyclic strength, resilient modulus Mr, equivalent damping ratio λ of modified calcareous sand for a range of PFA contents Rw and confining pressures σ3, as well as the mechanism of PFA solidified calcareous sand from a microscopic point of view. Useful empirical relationships among the governing parameters were established. A high-resolution field emission scanning electron microscope was used to study the internal pore and particles arrangement of PFA modified specimen. The experimental findings are crucial for improving the understanding of the fragility of calcareous sand and their improvement using an eco-friendly solution in the form of PFA.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/156042