A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect

A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect

Corrosion in reinforcing steel is an important mechanism that reduces the service life of reinforced concrete (RC) structures exposed to the marine environment. It is essential to produce an advanced method that assists in making reliable predictions for the service life of RC structures to assist c...

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Main Author: Sabtu @ Othman, Hilyati
Format: Thesis
Language:English
English
English
Published: 2021
Subjects:
T Technology (General)
Online Access:http://eprints.uthm.edu.my/8422/1/24p%20HILYATI%20SABTU.pdf
http://eprints.uthm.edu.my/8422/2/HILYATI%20SABTU%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/8422/3/HILYATI%20SABTU%20WATERMARK.pdf
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spelling my-uthm-ep.84222023-02-26T07:19:07Z A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect 2021-11 Sabtu @ Othman, Hilyati T Technology (General) Corrosion in reinforcing steel is an important mechanism that reduces the service life of reinforced concrete (RC) structures exposed to the marine environment. It is essential to produce an advanced method that assists in making reliable predictions for the service life of RC structures to assist cost-effectiveness in life span of asset management. This thesis aims to develop a probabilistic-based model to predict the probability of damage in RC structures due to chloride-induced concrete cover cracking. The probabilistic model developed in this thesis considers modifying the existing crack propagation model previously developed by Mullard and Stewart (2011). This research improved the existing crack propagation model by conducting two series of accelerated corrosion tests based on bidirectional (two-way) RC slab specimens. The modified crack propagation model is proposed by considering the effects of reinforcement confinement and spacing of reinforcing bars. The key variables in the crack propagation model are spatial random variables. Partly due to the variability in the quality of workmanship, environmental and material. One of the required statistical parameter for spatial variables include the scale of fluctuation. Since the data for the scale of fluctuation is scarce, the second major finding from this study is to propose a new value of the scale of fluctuation for concrete compressive strength using the Curve fitting method and the Kriging method. Finally, the modified crack propagation model for predicting the crack propagation time was then developed, then the most reliable value for the scale of fluctuation of concrete compressive strength was determined. The modified crack propagation model and the new scale of fluctuation of concrete compressive strength are used to predict the service life of RC structures due to chloride-induced cracking. By modelling spatial variability and incorporation with the Monte Carlo simulation method, the probability of corrosion damage can be measured at any time during the service life of RC structures. 2021-11 Thesis http://eprints.uthm.edu.my/8422/ http://eprints.uthm.edu.my/8422/1/24p%20HILYATI%20SABTU.pdf text en public http://eprints.uthm.edu.my/8422/2/HILYATI%20SABTU%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/8422/3/HILYATI%20SABTU%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Awam dan Alam Bina
institution Universiti Tun Hussein Onn Malaysia
collection UTHM Institutional Repository
language English
English
English
topic T Technology (General)
spellingShingle T Technology (General)
Sabtu @ Othman, Hilyati
A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
description Corrosion in reinforcing steel is an important mechanism that reduces the service life of reinforced concrete (RC) structures exposed to the marine environment. It is essential to produce an advanced method that assists in making reliable predictions for the service life of RC structures to assist cost-effectiveness in life span of asset management. This thesis aims to develop a probabilistic-based model to predict the probability of damage in RC structures due to chloride-induced concrete cover cracking. The probabilistic model developed in this thesis considers modifying the existing crack propagation model previously developed by Mullard and Stewart (2011). This research improved the existing crack propagation model by conducting two series of accelerated corrosion tests based on bidirectional (two-way) RC slab specimens. The modified crack propagation model is proposed by considering the effects of reinforcement confinement and spacing of reinforcing bars. The key variables in the crack propagation model are spatial random variables. Partly due to the variability in the quality of workmanship, environmental and material. One of the required statistical parameter for spatial variables include the scale of fluctuation. Since the data for the scale of fluctuation is scarce, the second major finding from this study is to propose a new value of the scale of fluctuation for concrete compressive strength using the Curve fitting method and the Kriging method. Finally, the modified crack propagation model for predicting the crack propagation time was then developed, then the most reliable value for the scale of fluctuation of concrete compressive strength was determined. The modified crack propagation model and the new scale of fluctuation of concrete compressive strength are used to predict the service life of RC structures due to chloride-induced cracking. By modelling spatial variability and incorporation with the Monte Carlo simulation method, the probability of corrosion damage can be measured at any time during the service life of RC structures.
format Thesis
qualification_name Doctor of Philosophy (PhD.)
qualification_level Doctorate
author Sabtu @ Othman, Hilyati
author_facet Sabtu @ Othman, Hilyati
author_sort Sabtu @ Othman, Hilyati
title A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
title_short A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
title_full A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
title_fullStr A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
title_full_unstemmed A new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
title_sort new service life prediction of reinforced concrete structures due to chloride-induced cover cracking with the confinement effect
granting_institution Universiti Tun Hussein Onn Malaysia
granting_department Fakulti Kejuruteraan Awam dan Alam Bina
publishDate 2021
url http://eprints.uthm.edu.my/8422/1/24p%20HILYATI%20SABTU.pdf
http://eprints.uthm.edu.my/8422/2/HILYATI%20SABTU%20COPYRIGHT%20DECLARATION.pdf
http://eprints.uthm.edu.my/8422/3/HILYATI%20SABTU%20WATERMARK.pdf
_version_ 1776103341996113920

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