The mechanical properties and structural performance of hybrid fibre reinforced concrete composite

Fibres in concrete provide a mean of preventing crack growth. Short discontinuous fibres have the advantage of being uniformly mixed and dispersed throughout the concrete. In this research, the mechanical properties of hybrid fibre reinforced concrete composite (HyFRCC) were investigated by combinin...

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Main Author:	Othman, Faezah Asmahani
Format:	Thesis
Language:	English
Published:	2014
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/48935/25/FaezahAsmahaniOthmanMFKA2014.pdf
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id	my-utm-ep.48935
record_format	uketd_dc
spelling	my-utm-ep.489352020-07-08T02:50:26Z The mechanical properties and structural performance of hybrid fibre reinforced concrete composite 2014-08 Othman, Faezah Asmahani TA Engineering (General). Civil engineering (General) Fibres in concrete provide a mean of preventing crack growth. Short discontinuous fibres have the advantage of being uniformly mixed and dispersed throughout the concrete. In this research, the mechanical properties of hybrid fibre reinforced concrete composite (HyFRCC) were investigated by combining polypropylene fibre (PP) with steel fibre (ST). PP fibre is good in preventing micro cracks while steel fibre is reliable in preventing macro cracks in concrete. Specimens incorporated with ST and PP fibres were in the mix proportion of 100-0%, 75-25%, 50-50%, 25-75%, and 0-100% at volume fraction of 0.5%, 1.0%, and 1.5%. Compression test, flexural test, splitting tensile test, flexural toughness, and Young’s Modulus were carried out to determine the mechanical properties of HyFRCC. By combining these two fibres in concrete, the crack growth reduced where PP fibre was found to improve the tensile strain capacity, while ST fibre contributed to the improvement on the ultimate tensile strength. HyFRCC specimens also delayed the failure phenomena due to the different tensile strength of PP and ST fibres compared with the sudden failure experienced by plain concrete. The experimental test results found that HyFRCC with the combined mix proportion of 75% ST fibre + 25% PP fibre at volume fraction of 1.5% can be adjudged as the optimum percentage. This optimum percentage was then applied in reinforced concrete beams to study the structural performance in flexural of shear. In conclusion, HyFRCC beam is tougher and stronger compared with the control beam based on the load-deflection relationship. Crack pattern of HyFRCC beam shows that the crack width and crack spacing reduces compared with the control beam. The effect of combining ST and PP fibres in concrete enhances the tensile strength, the concrete strain hardening and flexural toughness. 2014-08 Thesis http://eprints.utm.my/id/eprint/48935/ http://eprints.utm.my/id/eprint/48935/25/FaezahAsmahaniOthmanMFKA2014.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:85476 masters 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) Othman, Faezah Asmahani The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
description	Fibres in concrete provide a mean of preventing crack growth. Short discontinuous fibres have the advantage of being uniformly mixed and dispersed throughout the concrete. In this research, the mechanical properties of hybrid fibre reinforced concrete composite (HyFRCC) were investigated by combining polypropylene fibre (PP) with steel fibre (ST). PP fibre is good in preventing micro cracks while steel fibre is reliable in preventing macro cracks in concrete. Specimens incorporated with ST and PP fibres were in the mix proportion of 100-0%, 75-25%, 50-50%, 25-75%, and 0-100% at volume fraction of 0.5%, 1.0%, and 1.5%. Compression test, flexural test, splitting tensile test, flexural toughness, and Young’s Modulus were carried out to determine the mechanical properties of HyFRCC. By combining these two fibres in concrete, the crack growth reduced where PP fibre was found to improve the tensile strain capacity, while ST fibre contributed to the improvement on the ultimate tensile strength. HyFRCC specimens also delayed the failure phenomena due to the different tensile strength of PP and ST fibres compared with the sudden failure experienced by plain concrete. The experimental test results found that HyFRCC with the combined mix proportion of 75% ST fibre + 25% PP fibre at volume fraction of 1.5% can be adjudged as the optimum percentage. This optimum percentage was then applied in reinforced concrete beams to study the structural performance in flexural of shear. In conclusion, HyFRCC beam is tougher and stronger compared with the control beam based on the load-deflection relationship. Crack pattern of HyFRCC beam shows that the crack width and crack spacing reduces compared with the control beam. The effect of combining ST and PP fibres in concrete enhances the tensile strength, the concrete strain hardening and flexural toughness.
format	Thesis
qualification_level	Master's degree
author	Othman, Faezah Asmahani
author_facet	Othman, Faezah Asmahani
author_sort	Othman, Faezah Asmahani
title	The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
title_short	The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
title_full	The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
title_fullStr	The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
title_full_unstemmed	The mechanical properties and structural performance of hybrid fibre reinforced concrete composite
title_sort	mechanical properties and structural performance of hybrid fibre reinforced concrete composite
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2014
url	http://eprints.utm.my/id/eprint/48935/25/FaezahAsmahaniOthmanMFKA2014.pdf
_version_	1747817506547957760

The mechanical properties and structural performance of hybrid fibre reinforced concrete composite

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