Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites

UHPFRCC is usually applied to rehabilitation bridge of dam, building and other structures. Good bond strength between old concrete substrate and a newly overlaid repair material is a very important factor in assuring the performance of concrete repairs. However, the properties of concrete would be a...

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Main Author:	Zainal, Nur Liyana
Format:	Thesis
Language:	English
Published:	2016
Subjects:	T Technology
Online Access:	http://eprints.usm.my/45774/1/Effects%20Of%20Exposure%20To%20Elevated%20Temperatures%20On%20The%20Bond%20Characteristics%20Between%20Normal%20Concrete%20Substrate%20And%20Ultra%20High%20Performance%20Fiber%20Reinforced%20Cementitious%20Composites.pdf
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spelling	my-usm-ep.457742020-10-22T03:03:17Z Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites 2016-08 Zainal, Nur Liyana T Technology TA1-2040 Engineering (General). Civil engineering (General) UHPFRCC is usually applied to rehabilitation bridge of dam, building and other structures. Good bond strength between old concrete substrate and a newly overlaid repair material is a very important factor in assuring the performance of concrete repairs. However, the properties of concrete would be affected when it is exposed to high temperature. The quality assurance of the bond strength requires methods that can quantify the bond strength as well as identify the failure mode. A newly patented class of green UHPFRCC known as green Universiti Sains Malaysia reinforced concrete (GUSMRC) was developed. This concrete contains 50% of the cement total volume by pozzolanic material, ultra-fine POFA (UPOFA). The objective of this study is to evaluate the interfacial bonding characteristics between old concrete and new repair material after the composite is exposed to elevated temperatures of 100⁰C, 200⁰C, 300⁰C, 400⁰C and 500⁰C. GUSMRC was applied as the new repair material on the normal concrete substrate and the surface has been prepared / roughened either by sand blasting (SB) or grinding (GR). In addition, changes on the mechanical properties of the monolithic samples of the repair material as well as the normal concrete substrate were also evaluated after the exposure to the elevated temperatures. The characteristic of interfacial bond were assessed using the slant shear, pull-off, splitting tensile, and flexural strength test to evaluate the influence of two types of surface roughness and to evaluate the effect after the exposure to elevated temperatures. The results showed that the new green concrete overlay achieved good bond strength with the NC. Sand blasting surface treatment showed the excellent bonding properties compared to grinding before and after the exposure to the elevated temperatures. Mostly all the failure modes showed failures at NC substrate and automatically proved that the bondings between two layers are strong. The critical loss of strength for GUSMRC was recorded at 400⁰C and 500⁰C. 2016-08 Thesis http://eprints.usm.my/45774/ http://eprints.usm.my/45774/1/Effects%20Of%20Exposure%20To%20Elevated%20Temperatures%20On%20The%20Bond%20Characteristics%20Between%20Normal%20Concrete%20Substrate%20And%20Ultra%20High%20Performance%20Fiber%20Reinforced%20Cementitious%20Composites.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Awam
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Zainal, Nur Liyana Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
description	UHPFRCC is usually applied to rehabilitation bridge of dam, building and other structures. Good bond strength between old concrete substrate and a newly overlaid repair material is a very important factor in assuring the performance of concrete repairs. However, the properties of concrete would be affected when it is exposed to high temperature. The quality assurance of the bond strength requires methods that can quantify the bond strength as well as identify the failure mode. A newly patented class of green UHPFRCC known as green Universiti Sains Malaysia reinforced concrete (GUSMRC) was developed. This concrete contains 50% of the cement total volume by pozzolanic material, ultra-fine POFA (UPOFA). The objective of this study is to evaluate the interfacial bonding characteristics between old concrete and new repair material after the composite is exposed to elevated temperatures of 100⁰C, 200⁰C, 300⁰C, 400⁰C and 500⁰C. GUSMRC was applied as the new repair material on the normal concrete substrate and the surface has been prepared / roughened either by sand blasting (SB) or grinding (GR). In addition, changes on the mechanical properties of the monolithic samples of the repair material as well as the normal concrete substrate were also evaluated after the exposure to the elevated temperatures. The characteristic of interfacial bond were assessed using the slant shear, pull-off, splitting tensile, and flexural strength test to evaluate the influence of two types of surface roughness and to evaluate the effect after the exposure to elevated temperatures. The results showed that the new green concrete overlay achieved good bond strength with the NC. Sand blasting surface treatment showed the excellent bonding properties compared to grinding before and after the exposure to the elevated temperatures. Mostly all the failure modes showed failures at NC substrate and automatically proved that the bondings between two layers are strong. The critical loss of strength for GUSMRC was recorded at 400⁰C and 500⁰C.
format	Thesis
qualification_level	Master's degree
author	Zainal, Nur Liyana
author_facet	Zainal, Nur Liyana
author_sort	Zainal, Nur Liyana
title	Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
title_short	Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
title_full	Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
title_fullStr	Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
title_full_unstemmed	Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites
title_sort	effects of exposure to elevated temperatures on the bond characteristics between normal concrete substrate and ultra high performance fiber reinforced cementitious composites
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Awam
publishDate	2016
url	http://eprints.usm.my/45774/1/Effects%20Of%20Exposure%20To%20Elevated%20Temperatures%20On%20The%20Bond%20Characteristics%20Between%20Normal%20Concrete%20Substrate%20And%20Ultra%20High%20Performance%20Fiber%20Reinforced%20Cementitious%20Composites.pdf
_version_	1747821563180220416

Effects Of Exposure To Elevated Temperatures On The Bond Characteristics Between Normal Concrete Substrate And Ultra High Performance Fiber Reinforced Cementitious Composites

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