Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures

Lightweight aggregate concrete (LWAC) has become increasingly popular due to its lightweight properties and high strength. This results in cost savings due to an overall decrease in dead load on the structure reducing the total amount of concrete used for the building. However, LWAC has its weaknes...

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Main Author: Quek, Ervin Jing Yi
Other Authors: Tan Kang Hai
Format: Final Year Project
Language:English
Published: Nanyang Technological University 2021
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Online Access:https://hdl.handle.net/10356/150089
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spelling sg-ntu-dr.10356-1500892021-05-22T12:35:26Z Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures Quek, Ervin Jing Yi Tan Kang Hai School of Civil and Environmental Engineering CKHTAN@ntu.edu.sg Engineering::Civil engineering Lightweight aggregate concrete (LWAC) has become increasingly popular due to its lightweight properties and high strength. This results in cost savings due to an overall decrease in dead load on the structure reducing the total amount of concrete used for the building. However, LWAC has its weaknesses. The increase in concrete strength is typically accompanied with the decrease in its fire resistance. This comes from the fact that the increase in strength usually comes from the increased density of the material causing lower fire resistance capabilities due to lower permeability. For LWAC, it usually has a brittleness issue and inferior bond behaviour as compared to Normal Weight Concrete (NWC). Steel fibres have been known to improve the strength of concrete and residual strength to a certain extent and will be introduced to improve the bond-slip behaviour of LWAC to address the issues mentioned. The percentage of steel fibres into the concrete mixture will be varied to discuss the effects on the bond-slip behaviour. This research aims to study the effects of steel fibre on the bond-slip behaviour of LWAC after exposure to various temperatures. A total of 32 experiments will be done on 100 mm and 200 mm diameter concrete specimens with a 13 mm steel reinforcing bar embedded in it. The variable parameters will be the concrete specimens’ diameter, temperature from ambient to 600 °C , and steel fibre content. Bond stress-slip curves of the experiments will be plotted and compared against the fib model code 2010 and subsequent failure mode of the experiment will be discussed. From this research works, it is found that temperature exposure may shift the failure mode from pull-out to splitting, in addition to deterioration of bond strength. The addition of steel fibre was observed to prevent the occurrence of splitting failure, as well as to improve the peak bond stress. Bachelor of Engineering (Civil) 2021-05-22T12:32:59Z 2021-05-22T12:32:59Z 2021 Final Year Project (FYP) Quek, E. J. Y. (2021). Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/150089 https://hdl.handle.net/10356/150089 en ST-21 application/pdf Nanyang Technological University
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Civil engineering
spellingShingle Engineering::Civil engineering
Quek, Ervin Jing Yi
Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
description Lightweight aggregate concrete (LWAC) has become increasingly popular due to its lightweight properties and high strength. This results in cost savings due to an overall decrease in dead load on the structure reducing the total amount of concrete used for the building. However, LWAC has its weaknesses. The increase in concrete strength is typically accompanied with the decrease in its fire resistance. This comes from the fact that the increase in strength usually comes from the increased density of the material causing lower fire resistance capabilities due to lower permeability. For LWAC, it usually has a brittleness issue and inferior bond behaviour as compared to Normal Weight Concrete (NWC). Steel fibres have been known to improve the strength of concrete and residual strength to a certain extent and will be introduced to improve the bond-slip behaviour of LWAC to address the issues mentioned. The percentage of steel fibres into the concrete mixture will be varied to discuss the effects on the bond-slip behaviour. This research aims to study the effects of steel fibre on the bond-slip behaviour of LWAC after exposure to various temperatures. A total of 32 experiments will be done on 100 mm and 200 mm diameter concrete specimens with a 13 mm steel reinforcing bar embedded in it. The variable parameters will be the concrete specimens’ diameter, temperature from ambient to 600 °C , and steel fibre content. Bond stress-slip curves of the experiments will be plotted and compared against the fib model code 2010 and subsequent failure mode of the experiment will be discussed. From this research works, it is found that temperature exposure may shift the failure mode from pull-out to splitting, in addition to deterioration of bond strength. The addition of steel fibre was observed to prevent the occurrence of splitting failure, as well as to improve the peak bond stress.
author2 Tan Kang Hai
author_facet Tan Kang Hai
Quek, Ervin Jing Yi
format Final Year Project
author Quek, Ervin Jing Yi
author_sort Quek, Ervin Jing Yi
title Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
title_short Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
title_full Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
title_fullStr Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
title_full_unstemmed Effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
title_sort effect of steel fibre on local pull-out behaviour of lightwight aggregate concrete in ambient and after exposure to elevated temperatures
publisher Nanyang Technological University
publishDate 2021
url https://hdl.handle.net/10356/150089
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