Development of Geopolymer Concrete for Precast Pipe Application

Dangol, Sumita

Development of Geopolymer Concrete for Precast Pipe Application

Dangol, Sumita

Permalink

Publication Type:: Thesis
Issue Date:: 2023

Open Access

Copyright Clearance Process

Recently Added
In Progress
Open Access

This item is open access.

Adobe PDF

Download thesisAdobe PDF (8 MB)

View statistics

Full metadata record

Field	Value	Language
dc.contributor.author	Dangol, Sumita
dc.date.accessioned	2023-09-05T23:28:12Z
dc.date.available	2023-09-05T23:28:12Z
dc.date.issued	2023
dc.identifier.uri	http://hdl.handle.net/10453/171924
dc.description	University of Technology Sydney. Faculty of Engineering and Information Technology.	en_US.UTF-8
dc.description.abstract	Recent development in material science has introduced geopolymer as an appropriate alternative to Ordinary Portland cement (OPC) that uses industrial by-products as its source material. Past studies on geopolymer concrete have demonstrated remarkable gain in early age strength and resistance against chemical reactivity by geopolymer concrete in relation to OPC. These properties of geopolymer can be capitalised in precast concrete pipes production. However, general use of geopolymer binder in infrastructure development is yet to be observed in the absence of proper design guidelines. This study recognizes the need to interpret structural response of geopolymer concrete pipes and therefore, investigate the load-deflection behaviour of geopolymer concrete pipes. In this study, material properties of two types of geopolymer concrete: general purpose and high strength geopolymer concrete alongside OPC concrete with a grade 50 MPa concrete mix has been examined, along with the bond-slip behaviour between the reinforcement bar and geopolymer concrete. A three-dimensional finite element model of reinforced concrete pipe was developed to analyse the load carrying capacity of reinforced and non-reinforced geopolymer concrete pipes under three-edge bearing test. Parametric study on load-deflection behaviour of geopolymer concrete pipe was carried out. The effect on loading capacity due to pre-existing crack of varying length, width and location was also explored to assist in damage assessment of pipe in construction and service practices. Based on the experimental investigation on mechanical properties and bond-slip behaviour, suitable relationship for flexural strength, tensile strength and modulus of elasticity for powder based geopolymer concrete is proposed. The bond-slip relation for powder based geopolymer concrete is proposed and used to further analyse the difference in finite element model with and without bond consideration. The numerical analysis results indicated geopolymer concrete compared to same grade OPC concrete achieved greater loading capacity in pipe structure due to higher tensile performance. It was found that geopolymer concrete pipes could meet the specified strength requirement for OPC concrete with up to 20% reduction in reinforcement area and increased concrete cover. Further comparing pipes with pre-existing cracks of different length, depth and location, the load bearing capacity in pipe was found to be affected more by the crack depth compared to crack length, while crack along the loading axis was found susceptible to pipe damage compared to cracks at other locations. The results obtained from the study can be utilised as guidelines for geopolymer concrete pipes design for their application in the construction industry.	en_US.UTF-8
dc.format	Thesis (PhD)
dc.language.iso	en_US	en_US.UTF-8
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/171924/1/thesis.pdf
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	© 2023 Sumita Dangol
dc.rights	au.edu.uts.lib/cph
dc.title	Development of Geopolymer Concrete for Precast Pipe Application	en_US.UTF-8
dc.type	Thesis
utslib.copyright.status	open_access	*

Abstract:

Recent development in material science has introduced geopolymer as an appropriate alternative to Ordinary Portland cement (OPC) that uses industrial by-products as its source material. Past studies on geopolymer concrete have demonstrated remarkable gain in early age strength and resistance against chemical reactivity by geopolymer concrete in relation to OPC. These properties of geopolymer can be capitalised in precast concrete pipes production. However, general use of geopolymer binder in infrastructure development is yet to be observed in the absence of proper design guidelines. This study recognizes the need to interpret structural response of geopolymer concrete pipes and therefore, investigate the load-deflection behaviour of geopolymer concrete pipes. In this study, material properties of two types of geopolymer concrete: general purpose and high strength geopolymer concrete alongside OPC concrete with a grade 50 MPa concrete mix has been examined, along with the bond-slip behaviour between the reinforcement bar and geopolymer concrete. A three-dimensional finite element model of reinforced concrete pipe was developed to analyse the load carrying capacity of reinforced and non-reinforced geopolymer concrete pipes under three-edge bearing test. Parametric study on load-deflection behaviour of geopolymer concrete pipe was carried out. The effect on loading capacity due to pre-existing crack of varying length, width and location was also explored to assist in damage assessment of pipe in construction and service practices. Based on the experimental investigation on mechanical properties and bond-slip behaviour, suitable relationship for flexural strength, tensile strength and modulus of elasticity for powder based geopolymer concrete is proposed. The bond-slip relation for powder based geopolymer concrete is proposed and used to further analyse the difference in finite element model with and without bond consideration. The numerical analysis results indicated geopolymer concrete compared to same grade OPC concrete achieved greater loading capacity in pipe structure due to higher tensile performance. It was found that geopolymer concrete pipes could meet the specified strength requirement for OPC concrete with up to 20% reduction in reinforcement area and increased concrete cover. Further comparing pipes with pre-existing cracks of different length, depth and location, the load bearing capacity in pipe was found to be affected more by the crack depth compared to crack length, while crack along the loading axis was found susceptible to pipe damage compared to cracks at other locations. The results obtained from the study can be utilised as guidelines for geopolymer concrete pipes design for their application in the construction industry.

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

http://hdl.handle.net/10453/171924