Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature

Fire-damaged reinforced concrete structure requires repair work to improve its serviceability and prevent structural failure. The intense fire exposure on the structure deteriorates its strength and durability. Fire-damaged concrete structure was normally repaired using the shotcrete and normal str...

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Format:	Thesis
Language:	English
Subjects:	Concrete beams Reinforced concrete Reinforced concrete construction Concrete Ultra High Performance Concrete (UHPC)
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/3/Declaration%20Form.jpg
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spelling	my-unimap-728802021-12-03T03:32:18Z Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature Mohd Zulham Affandi, Mohd Zahid Fire-damaged reinforced concrete structure requires repair work to improve its serviceability and prevent structural failure. The intense fire exposure on the structure deteriorates its strength and durability. Fire-damaged concrete structure was normally repaired using the shotcrete and normal strength concrete as practised previously. In experimental work, usage of fibre reinforced polymer (FRP) as repair material to retrofit or wrap around the fire-damaged concrete indicates improve strength but has lower effect on stiffness. This study used Ultra High Performance Concrete (UHPC) as repair material. UHPC composed of fine size aggregate, cement, silica fume and superplasticizer. Another composition of UHPC that also includes steel fibre is considered as ultra high performance fibre reinforced concrete (UHPFRC). This material has an excellent mechanical properties compared to high strength concrete and steel fibre in the UHPFRC enhances its ductility behaviour. Contrary to normal practise of curing regime for UHPC, this research adopted ambient temperature curing instead of high temperature curing. This is to ease the application of UHPC on site. The aim of this research is to repair fire-damaged reinforced beam concrete with 2 types of material which is UHPC and UHPFRC. UHPC which does not incorporate steel fibre in the mix was laid on compressive face of fire-damaged beam sample. UHPC is considered as economical compared to UHPFRC and aimed to repair fire-damaged beam as additional layer of compression. UHPFRC has steel fibre in the mix and is placed on tensile face of fire-damaged beam. UHPFRC is aimed to repair the fire-damaged sample as additional tensile layer of composite structure. Assessment is made based on flexural strength, peak load capacity, toughness and elastic stiffness to evaluate the suitability of UHPC as repair material. Repair of 400°C fire-damaged samples using UHPC fully regained its original peak load capacity and toughness. Repair of 400°C fire-damaged samples using UHPFRC fully regained its original flexural strength, peak load capacity and toughness. Repair of 600°C fire-damaged samples using UHPC and UHPFRC failed to fully rehabilitate its peak load capacity, flexural strength, elastic stiffness and toughness. In conclusion, UHPC of 20mm thickness is not viable as repair material for fire-damaged concrete. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72880 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/4/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/1/Page%201-24.pdf 045acec217eeedc04e726c93d2f5d789 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/2/Full%20text.pdf d27319046a967789e5923fe205b2b0c8 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/3/Declaration%20Form.jpg 6723455c9ade7f1b56223c271cf45715 Universiti Malaysia Perlis (UniMAP) Concrete beams Reinforced concrete Reinforced concrete construction Concrete Ultra High Performance Concrete (UHPC) School of Environmental Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Mohd Zulham Affandi, Mohd Zahid
topic	Concrete beams Reinforced concrete Reinforced concrete construction Concrete Ultra High Performance Concrete (UHPC)
spellingShingle	Concrete beams Reinforced concrete Reinforced concrete construction Concrete Ultra High Performance Concrete (UHPC) Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
description	Fire-damaged reinforced concrete structure requires repair work to improve its serviceability and prevent structural failure. The intense fire exposure on the structure deteriorates its strength and durability. Fire-damaged concrete structure was normally repaired using the shotcrete and normal strength concrete as practised previously. In experimental work, usage of fibre reinforced polymer (FRP) as repair material to retrofit or wrap around the fire-damaged concrete indicates improve strength but has lower effect on stiffness. This study used Ultra High Performance Concrete (UHPC) as repair material. UHPC composed of fine size aggregate, cement, silica fume and superplasticizer. Another composition of UHPC that also includes steel fibre is considered as ultra high performance fibre reinforced concrete (UHPFRC). This material has an excellent mechanical properties compared to high strength concrete and steel fibre in the UHPFRC enhances its ductility behaviour. Contrary to normal practise of curing regime for UHPC, this research adopted ambient temperature curing instead of high temperature curing. This is to ease the application of UHPC on site. The aim of this research is to repair fire-damaged reinforced beam concrete with 2 types of material which is UHPC and UHPFRC. UHPC which does not incorporate steel fibre in the mix was laid on compressive face of fire-damaged beam sample. UHPC is considered as economical compared to UHPFRC and aimed to repair fire-damaged beam as additional layer of compression. UHPFRC has steel fibre in the mix and is placed on tensile face of fire-damaged beam. UHPFRC is aimed to repair the fire-damaged sample as additional tensile layer of composite structure. Assessment is made based on flexural strength, peak load capacity, toughness and elastic stiffness to evaluate the suitability of UHPC as repair material. Repair of 400°C fire-damaged samples using UHPC fully regained its original peak load capacity and toughness. Repair of 400°C fire-damaged samples using UHPFRC fully regained its original flexural strength, peak load capacity and toughness. Repair of 600°C fire-damaged samples using UHPC and UHPFRC failed to fully rehabilitate its peak load capacity, flexural strength, elastic stiffness and toughness. In conclusion, UHPC of 20mm thickness is not viable as repair material for fire-damaged concrete.
format	Thesis
title	Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
title_short	Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
title_full	Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
title_fullStr	Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
title_full_unstemmed	Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
title_sort	study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Environmental Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/2/Full%20text.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72880/3/Declaration%20Form.jpg
_version_	1747836878179008512

Study on the potential of repair fire-damaged reinforced concrete beams using ultra high performance concrete with curing at ambient temperature

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