Behaviour of repaired composite steel pipeline using epoxy grout as infill material

The use of Fibre Reinforced Polymer (FRP) composites together with infill grout has been proven effective for repairing damaged steel pipelines. The common understanding of the role of grout is to fill the damaged section and to transfer loads from damaged pipeline to composite wrap. The properties...

Full description

Saved in:

Bibliographic Details
Main Author:	Lim, Kar Sing
Format:	Thesis
Language:	English
Published:	2017
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/84136/1/LimKarSingPFKA2017.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-utm-ep.84136
record_format	uketd_dc
spelling	my-utm-ep.841362019-12-16T01:56:31Z Behaviour of repaired composite steel pipeline using epoxy grout as infill material 2017-01 Lim, Kar Sing TA Engineering (General). Civil engineering (General) The use of Fibre Reinforced Polymer (FRP) composites together with infill grout has been proven effective for repairing damaged steel pipelines. The common understanding of the role of grout is to fill the damaged section and to transfer loads from damaged pipeline to composite wrap. The properties of grouts are important parameters used in numerical simulation or theoretical prediction on the behaviour of a repair system. However, relatively limited information on the behaviour and role of grout in composite repair system has restricted efforts to explore the contribution of grouts as a secondary load bearing component. Therefore, this study aimed to investigate the performance and behaviour of epoxy grouts in terms of load transfer mechanism and load bearing capacity of pipeline composite repair system through detailed material characterization, hydrostatic burst test and finite element analysis (FEA). Selected mechanical and thermal tests were carried out on ten different grouts, steel pipe coupon and FRP composite wrap. Four hydrostatic burst tests were conducted on non-defect steel pipe, defective steel pipe and two composite repaired steel pipes. FEA was then utilized to enrich the information of grout in terms of load transfer mechanism and load bearing capacity. The finite element (FE) models were developed to simulate all hydrostatic burst tests for sensitivity analysis purposes. Results revealed that Grout A with highest silica sand filler content exhibits the highest modulus under all loading conditions. In terms of strength, Grout A shows the best performance under compressive load but the lowest resistance under tensile, flexural and lap shear load. Modified grout with no filler content, Grout A (1:0), shows contradictory properties and behaviour. In studying the effect of different grouts on overall performance of composite repaired steel pipe, Grout A and Grout A (1:0) were used to repair two steel pipe segments. Both grouts have increased the burst pressure of the steel pipe by about 23% and 26%, respectively. All FE models were found to be capable of predicting the behaviour and burst pressure of experimental test with margin of error less than 8%. The grout has experienced relatively high tensile stress when compared with the compressive stress. The highest tensile stress of grout was found at hoop direction while the highest compressive stress was recorded at radial direction. In addition, sensitivity analysis revealed that repair using Grout B resulted in 8% decrease of burst pressure, while grout with high tensile modulus and strength increased the burst pressure by 11%. Thus, based on the experimental test and numerical analysis, it is proven that the role of grout is not limited to transferring load and filling the defect, as it also provides additional reinforcement. It was also confirmed that different properties of grout affect the overall performance of repair. For a low tensile strength grout, an increase of modulus shows little difference of burst pressure, while for high tensile strength grout, a similar increase in modulus has led to a considerable increment in burst pressure. The finding in this study is significant as it provides comprehensive understanding of the role and contribution of grout in composite repaired steel pipeline. This can serve as an initial step towards optimizing the current design, such as minimizing the usage of composite layers and subsequently design repair without composite layers. 2017-01 Thesis http://eprints.utm.my/id/eprint/84136/ http://eprints.utm.my/id/eprint/84136/1/LimKarSingPFKA2017.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:126052 phd doctoral Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Lim, Kar Sing Behaviour of repaired composite steel pipeline using epoxy grout as infill material
description	The use of Fibre Reinforced Polymer (FRP) composites together with infill grout has been proven effective for repairing damaged steel pipelines. The common understanding of the role of grout is to fill the damaged section and to transfer loads from damaged pipeline to composite wrap. The properties of grouts are important parameters used in numerical simulation or theoretical prediction on the behaviour of a repair system. However, relatively limited information on the behaviour and role of grout in composite repair system has restricted efforts to explore the contribution of grouts as a secondary load bearing component. Therefore, this study aimed to investigate the performance and behaviour of epoxy grouts in terms of load transfer mechanism and load bearing capacity of pipeline composite repair system through detailed material characterization, hydrostatic burst test and finite element analysis (FEA). Selected mechanical and thermal tests were carried out on ten different grouts, steel pipe coupon and FRP composite wrap. Four hydrostatic burst tests were conducted on non-defect steel pipe, defective steel pipe and two composite repaired steel pipes. FEA was then utilized to enrich the information of grout in terms of load transfer mechanism and load bearing capacity. The finite element (FE) models were developed to simulate all hydrostatic burst tests for sensitivity analysis purposes. Results revealed that Grout A with highest silica sand filler content exhibits the highest modulus under all loading conditions. In terms of strength, Grout A shows the best performance under compressive load but the lowest resistance under tensile, flexural and lap shear load. Modified grout with no filler content, Grout A (1:0), shows contradictory properties and behaviour. In studying the effect of different grouts on overall performance of composite repaired steel pipe, Grout A and Grout A (1:0) were used to repair two steel pipe segments. Both grouts have increased the burst pressure of the steel pipe by about 23% and 26%, respectively. All FE models were found to be capable of predicting the behaviour and burst pressure of experimental test with margin of error less than 8%. The grout has experienced relatively high tensile stress when compared with the compressive stress. The highest tensile stress of grout was found at hoop direction while the highest compressive stress was recorded at radial direction. In addition, sensitivity analysis revealed that repair using Grout B resulted in 8% decrease of burst pressure, while grout with high tensile modulus and strength increased the burst pressure by 11%. Thus, based on the experimental test and numerical analysis, it is proven that the role of grout is not limited to transferring load and filling the defect, as it also provides additional reinforcement. It was also confirmed that different properties of grout affect the overall performance of repair. For a low tensile strength grout, an increase of modulus shows little difference of burst pressure, while for high tensile strength grout, a similar increase in modulus has led to a considerable increment in burst pressure. The finding in this study is significant as it provides comprehensive understanding of the role and contribution of grout in composite repaired steel pipeline. This can serve as an initial step towards optimizing the current design, such as minimizing the usage of composite layers and subsequently design repair without composite layers.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Lim, Kar Sing
author_facet	Lim, Kar Sing
author_sort	Lim, Kar Sing
title	Behaviour of repaired composite steel pipeline using epoxy grout as infill material
title_short	Behaviour of repaired composite steel pipeline using epoxy grout as infill material
title_full	Behaviour of repaired composite steel pipeline using epoxy grout as infill material
title_fullStr	Behaviour of repaired composite steel pipeline using epoxy grout as infill material
title_full_unstemmed	Behaviour of repaired composite steel pipeline using epoxy grout as infill material
title_sort	behaviour of repaired composite steel pipeline using epoxy grout as infill material
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2017
url	http://eprints.utm.my/id/eprint/84136/1/LimKarSingPFKA2017.pdf
_version_	1747818439302447104

Behaviour of repaired composite steel pipeline using epoxy grout as infill material

Similar Items