Failure characterization of the interface between concrete substrates and fiber reinforced concrete repairs
department or school: Applied Science, Faculty of
department or school: Civil Engineering, Department of
data provider: DSpace
degree campus: UBCV
creator: Kabiri Far, Bardia
issued: 2021-04-21T22:19:52Z
issued: 2021
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: Concrete structures are severely susceptible to degradation as a result of mechanical or environmental processes. In most cases, retrofit is the only available option because reconstruction of the deteriorated structure is neither a feasible nor financially practical option. The overall performance of a repaired structure is highly dependent on the properties of its interface, which is the weakest part of the system. Fiber reinforced concrete (FRC) is a recognized repair material, however, there are still some knowledge gaps including lack of comprehensive understanding of the synergistic effects of fiber addition and surface preparation on composite structure, long-term behavior and durability of interfaces, and lack of standard design equations for concrete-FRC interfaces. In this study, synergistic effects of different fibers at various volume ratios and surface preparation on failure mechanism, bond strength, and crack growth resistance of concrete-FRC interfaces is investigated under Mode-I loading regime. Based on experimental data, design equations are proposed for concrete-FRC interfaces under Mode-I. These models address tensile strength and crack growth resistance of concrete-FRC interfaces encompassing various variables including surface preparation, type of repair material, and ductility of substrate and repair layers. Furthermore, the micromechanical properties of concrete-FRC interfaces are studied and the impact of fiber addition and curing condition on microhardness, porosity, durability, and water absorption of composite structures is assessed using micro-indentation, scanning electron microscopy (SEM), and micro-computed x-ray tomography (CT-scanning) techniques. Results indicate that there is a strong relationship between surface treatment, fiber content, and composite mechanical behavior. Fiber addition and improved surface treatment enhance response of composite systems in Mode-I. Semi-empirical models exhibit saturating trend between mechanical…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/77888
note: FAILURE CHARACTERIZATION OF THE INTERFACE BETWEEN CONCRETE SUBSTRATES AND FIBER REINFORCED CONCRETE REPAIRS by Bardia Kabiri Far B.Sc., International University of Imam Khomeini, 2014 M.Sc., University of Bologna, 2016 A DISSERTATION SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF DOCTOR OF PHILOSOPHY in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Civil Engineering) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) April 2021 © Bardia Kabiri Far, 2021 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the dissertation entitled: Failure characterization of the interface between concrete substrates and fiber reinforced concrete repairs submitted by Bardia Kabiri Far in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Civil Engineering Examining Committee: Cristina Zanotti, Assistant Professor, Civil Engineering, UBC Supervisor Philip Evans, Professor, Wood Science, UBC Supervisory Committee Member Shahria Alam, Professor, School of Engineering, UBC Okanagan University Examiner Tom Troczynski, Professor, Materials Engineering, UBC University Examiner Additional Supervisory Committee Members: Mattia Bacca, Assistant Professor, Mechanical Engineering, UBC Supervisory Committee Member Nemkumar Banthia, Professor, Civil Engineering, UBC Supervisory Committee Member iii Abstract Concrete structures are severely susceptible to degradation as a result of mechanical or environmental processes. In most cases, retrofit is the only available option because reconstruction of the deteriorated structure is neither a feasible nor financially practical option. The overall performance of a repaired structure is highly dependent on the properties of its interface, which is the weakest part of the system. Fiber reinforced concrete (FRC) is a recognized repair material, however, there are still some knowledge gaps including lack of comprehensi…
has type: Thesis/Dissertation
date issued: 2021-05
is shown at: 10.14288/1.0396886
language: eng
degree discipline: Civil Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/77888