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Practicality And Capability Of Ndt In Evaluating Long Term Durability Of Frp Repairs On Concrete Bridges
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Book Synopsis Practicality and Capability of NDT in Evaluating Long-term Durability of FRP Repairs on Concrete Bridges by :
Download or read book Practicality and Capability of NDT in Evaluating Long-term Durability of FRP Repairs on Concrete Bridges written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer (FRP) repairs on concrete structures have become popular, but their long-term durability remains in question. The objective of this research project is to investigate the efficiency, practicality, and capability of non-destructive testing in assessing the durability of FRP repairs applied on concrete bridges that have been in service for some years. Three bridges were chosen as the best available case studies: (1) the Safe Bridge with sprayed FRP in British Columbia, (2) the St-Étienne-de-Bolton Bridge with four different FRP wrap products in Quebec, and (3) the Leslie Street Bridge with wrap carbon fiber reinforced polymer in Ontario. These structures represent a wide variation in severity of environmental exposure, length of time in service, type of strengthening, and type of FRP product. They also encompass flexural and shear strengthening of beams and strengthening of columns. Two non-destructive evaluation techniques, active infrared thermography and impact-echo, were chosen as the most suitable methods of bond evaluation. The results of these non-destructive techniques were compared with the actual bond strength for accuracy and consistency. To measure the actual integrity of the bond, direct mechanical pull-off tests were performed as a complementary semi-destructive method. Initial indications are that infrared thermography enables investigation of vast areas in a reasonably time-efficient manner and provides reliable qualitative results. Impact-echo is found to be ineffective in evaluating the FRP bond, as the method is incapable of assaying the material close to the impact surface. The direct mechanical pull-off test was found to be relatively accurate in providing quantitative results in environmentally mild testing conditions. Use of the direct mechanical pull-off test, in a small sample, as substantiation of the infrared thermography, significantly increases the reliability of the non-destructive technique. In general, infrared.
Book Synopsis Developments in Fiber-Reinforced Polymer (FRP) Composites for Civil Engineering by : Nasim Uddin
Download or read book Developments in Fiber-Reinforced Polymer (FRP) Composites for Civil Engineering written by Nasim Uddin and published by Elsevier. This book was released on 2013-05-15 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber-reinforced polymer (FRP) composite materials has had a dramatic impact on civil engineering techniques over the past three decades. FRPs are an ideal material for structural applications where high strength-to-weight and stiffness-to-weight ratios are required. Developments in fiber-reinforced polymer (FRP) composites for civil engineering outlines the latest developments in fiber-reinforced polymer (FRP) composites and their applications in civil engineering. Part one outlines the general developments of fiber-reinforced polymer (FRP) use, reviewing recent advancements in the design and processing techniques of composite materials. Part two outlines particular types of fiber-reinforced polymers and covers their use in a wide range of civil engineering and structural applications, including their use in disaster-resistant buildings, strengthening steel structures and bridge superstructures. With its distinguished editor and international team of contributors, Developments in fiber-reinforced polymer (FRP) composites for civil engineering is an essential text for researchers and engineers in the field of civil engineering and industries such as bridge and building construction. Outlines the latest developments in fiber-reinforced polymer composites and their applications in civil engineering Reviews recent advancements in the design and processing techniques of composite materials Covers the use of particular types of fiber-reinforced polymers in a wide range of civil engineering and structural applications
Book Synopsis Bonded Repair and Retrofit of Concrete Structures Using FRP Composites by : Amir Mirmiran
Download or read book Bonded Repair and Retrofit of Concrete Structures Using FRP Composites written by Amir Mirmiran and published by Transportation Research Board. This book was released on 2004 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The global response to COVID-19 has demonstrated the importance of vigilance and preparedness for infectious diseases, particularly influenza. There is a need for more effective influenza vaccines and modern manufacturing technologies that are adaptable and scalable to meet demand during a pandemic. The rapid development of COVID-19 vaccines has demonstrated what is possible with extensive data sharing, researchers who have the necessary resources and novel technologies to conduct and apply their research, rolling review by regulators, and public-private partnerships. As demonstrated throughout the response to COVID-19, the process of research and development of novel vaccines can be significantly optimized when stakeholders are provided with the resources and technologies needed to support their response. Vaccine Research and Development to Advance Pandemic and Seasonal Influenza Preparedness and Response focuses on how to leverage the knowledge gained from the COVID-19 pandemic to optimize vaccine research and development (R&D) to support the prevention and control of seasonal and pandemic influenza. The committee's findings address four dimensions of vaccine R&D: (1) basic and translational science, (2) clinical science, (3) manufacturing science, and (4) regulatory science.
Book Synopsis Long Term Monitoring of Mechanical Properties of Fiber Reinforced Polymer Repair Materials by : Rebecca Atadero
Download or read book Long Term Monitoring of Mechanical Properties of Fiber Reinforced Polymer Repair Materials written by Rebecca Atadero and published by . This book was released on 2013 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the years, Fiber Reinforced Polymer (FRP) composites have gained popularity in transportation infrastructure as a material able to restore and increase the capacity of existing concrete elements. Properties such as a high strength to weight ratio, non-corrosive nature, durability, and high malleability make FRP materials an appealing alternative in the reinforcement of these structural elements. However, there are still concerns regarding the long-term performance of these repairs. Numerous studies have been completed by means of accelerated aging in the lab. However, behavior of these materials under realistic field conditions has yet to be thoroughly researched. As a result, this project was created to assess the durability of an FRP repair in the Castlewood Canyon Bridge in Colorado. In addition, a laboratory study was conducted to determine the long-term behavior of concrete reinforced with FRP when exposed to various environmental conditions. The specific tasks in this project include data collection and testing plans for field assessment, on-site testing and sample collection, laboratory testing and data analysis, and testing program with a focus on the effects of deicers on FRP. A literature review was developed to consider other concerns that the Colorado Department of Transportation (CDOT) engineers may have on the subject.
Book Synopsis NDT Methods for Evaluating FRP-Concrete Bond Performance by : Kenneth Crawford
Download or read book NDT Methods for Evaluating FRP-Concrete Bond Performance written by Kenneth Crawford and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The long-term bond performance, 15+ years, of FRP-structural systems applied to reinforced-concrete structures is largely unknown and not widely tested. FRP-structural system performance is a function of FRP-concrete bond condition and is subject to deterioration over time. The purpose of this investigation is to test and validate the non-destructive testing impulse-excitation technique to evaluate bond condition of FRP systems applied to concrete structures, in particular concrete highway bridges. The objective is to identify changes in the FRP-concrete bond state by analyzing changes in impulse excitation (impact) frequencies and sinusoid waveforms. Hammer impact tests were performed on two FRP-retrofitted highway bridges in Missouri and a bonded FRP test plate in the laboratory. Signal analysis of recorded impact acoustic emissions was performed on frequencies and waveform damping ratios of bonded and de-bonded FRP material on two bridges and in the lab. The frequencies and sinusoidal waveforms of the bonded and de-bonded FRP material on the bridges had a high degree of correlation to those of the bonded/de-bonded laboratory FRP plate. This investigation confirms the impulse excitation technique to test FRP bond on concrete structures, which provides accurate data on the bonded versus de-bonded FRP-bond condition.
Book Synopsis Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements by : Abdul-Hamid Zureick
Download or read book Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements written by Abdul-Hamid Zureick and published by Transportation Research Board. This book was released on 2009 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 655: Recommended Guide Specification for the Design of Externally Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements examines a recommended guide specification for the design of externally bonded Fiber-Reinforced Polymer (FRP) systems for the repair and strengthening of concrete bridge elements. The report addresses the design requirements for members subjected to different loading conditions including flexure, shear and torsion, and combined axial force and flexure. The recommended guide specification is supplemented by design examples to illustrate its use for different FRP strengthening applications.
Book Synopsis Nondestructive Testing of Materials and Structures by : Oral Büyüköztürk
Download or read book Nondestructive Testing of Materials and Structures written by Oral Büyüköztürk and published by Springer Science & Business Media. This book was released on 2012-09-09 with total page 1231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Condition assessment and characterization of materials and structures by means of nondestructive testing (NDT) methods is a priority need around the world to meet the challenges associated with the durability, maintenance, rehabilitation, retrofitting, renewal and health monitoring of new and existing infrastructures including historic monuments. Numerous NDT methods that make use of certain components of the electromagnetic and acoustic spectrum are currently in use to this effect with various levels of success and there is an intensive worldwide research effort aimed at improving the existing methods and developing new ones. The knowledge and information compiled in this book captures the current state of the art in NDT methods and their application to civil and other engineering materials and structures. Critical reviews and advanced interdisciplinary discussions by world-renowned researchers point to the capabilities and limitations of the currently used NDT methods and shed light on current and future research directions to overcome the challenges in their development and practical use. In this respect, the contents of this book will equally benefit practicing engineers and researchers who take part in characterization, assessment and health monitoring of materials and structures.
Book Synopsis Field Inspection of In-service FRP Bridge Decks by : Niket M. Telang
Download or read book Field Inspection of In-service FRP Bridge Decks written by Niket M. Telang and published by Transportation Research Board. This book was released on 2006 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluating FRP Repair Method for Cracked Prestressed Concrete Bridge Members Subjected to Repeated Loadings (phase 1) by : Calvin E Reed
Download or read book Evaluating FRP Repair Method for Cracked Prestressed Concrete Bridge Members Subjected to Repeated Loadings (phase 1) written by Calvin E Reed and published by . This book was released on 2005 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the details of a research study on the use of carbon fiber reinforced polymer (CFRP) sheets to repair and strengthen prestressed concrete bridge girders in flexure and shear. Five specimens that were removed from an overloaded bridge (Bridge #56) in Graham County, Kansas were tested.
Book Synopsis Long-term Durability of Fiber-reinforced Polymers (FRPS) and In-situ Monitoring of FRP Bridge Decks at O'Fallon Park Bridge by :
Download or read book Long-term Durability of Fiber-reinforced Polymers (FRPS) and In-situ Monitoring of FRP Bridge Decks at O'Fallon Park Bridge written by and published by . This book was released on 2004 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-Destructive Diagnostics of Concrete Floors by : Łukasz Sadowski
Download or read book Non-Destructive Diagnostics of Concrete Floors written by Łukasz Sadowski and published by CRC Press. This book was released on 2022-08-08 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete floors should be diagnosed in order to obtain the proper durability. Non-destructive testing (NDT) methods, which have numerous advantages and are very effective for in situ testing, are recommended for this purpose. Non-Destructive Diagnostics of Concrete Floors: Methods and Case Studies offers useful NDT methods, test methodologies, and case studies. This book contains classifications of NDT methods, examines their areas of usefulness in floor diagnostics, and explains the complementarity and reliability of NDT methods as well as the need to calibrate research equipment. It presents interesting case studies of concrete floors, such as dowelled floors, floors with a top layer made of stone slabs, industrial floors, industrial floors with a top layer of polyurethane-cement, layered floors, post-tensioned floors, and cement screeds. The authors have drawn on many years of experience in both academia and the practical diagnosis of concrete floors using NDT methods.
Book Synopsis Condition Assessment of (FRP) Fiber Reinforced Polymer Strengthening of Bridge Components by : Hemachand Pallempati
Download or read book Condition Assessment of (FRP) Fiber Reinforced Polymer Strengthening of Bridge Components written by Hemachand Pallempati and published by . This book was released on 2015 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber Reinforced Polymers (FRP) is a newly developed composite type of material which have many advantages over conventional materials (concrete and steel) like light weight, non-corrosive nature, design flexibility and quick installation. Due to its superior thermo-mechanical properties, it has emerged as one of the best economical method to strengthen and repair reinforced concrete bridges that were damaged each year due to various reasons like structural deterioration over time, fire accidents, corrosion of steel reinforcement and over height vehicle collision. This research aims to evaluate the long term performance of FRP strengthened bridge components with the help of Pull-Off tests. It will also recommend certain guidelines to be followed during the time of repair for the better performance of FRP. In this study a total of eight concrete bridges in the DFW area, that were damaged in the past and strengthened using Carbon Fiber Reinforced Polymer (CFRP) wrap were identified and later Pull-Off tests were performed on selected test locations of the bridge components as per the specifications of ASTM D7522/D7522M (2009) .After evaluation of the Pull-Off test results it was determined that the overall performance of FRP is good.
Book Synopsis Mechanics and Subcritical Cracking of FRP-concrete Interface by : Chao Zhang
Download or read book Mechanics and Subcritical Cracking of FRP-concrete Interface written by Chao Zhang and published by . This book was released on 2011 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: The need for safe, effective, and efficient methods to strengthen and upgrade our nation's infrastructures is clear. Strengthening Reinforced Concrete (RC) members using Fiber Reinforced Polymer (FRP) composites through external bonding has emerged as a viable technique to retrofit/repair deteriorated infrastructures. The interface between the FRP and concrete plays a critical role in this technique. This study proposes a life-cycle analytical framework on the integrity and long-term durability of the FRP-concrete interface through a combined analytical, numerical, and experimental approach. A novel three-parameter elastic foundation model (3PEF) is first established to provide a general tool to analyze and evaluate the design of the FRP strengthening system. This model correctly predicts the location where debonding can occur. To simulate the interface stress redistribution and creep deformations accumulated during service life due to the strong time dependent features of the adhesive layer, linear viscoelastic analytical solutions are then developed for the FRP-strengthened RC beams. Small cracks usually exist within the FRP-concrete interface, making fracture mechanics a more appropriate tool to evaluate the integrity of the FRP-concrete interface. Analytical solutions of energy release rate (ERR) and its phase angle at the tip of a crack along the FRP-concrete interface are obtained. Under the synergistic effects of the service loads and environments species, these small cracks can grow slowly even if the ERR at the crack tip is lower than the critical value. This slow-crack growth process is known as environment-assisted subcritical cracking. A series of subcritical cracking testing are conducted using a wedge-driven testing to gain the ability to accurately predict the long-term durability of the FRP-concrete interface. It has been found that water, deicing salt and alkaline solutions can substantially reduce the ERR at the crack tip needed to drive the subcritical crack growth along the epoxy-concrete interface. Once the small cracks grow to the critical length, critical debonding will occur, leading to the premature failure of the structure. A nonlinear fracture mechanics model using a Cohesive Zone Model (CZM) is finally developed to simulate this final failure phase of the FRP-concrete interface.
Author :American Association of State Highway and Transportation Officials Publisher : ISBN 13 :9781560518075 Total Pages :0 pages Book Rating :4.5/5 (18 download)
Book Synopsis Guide Specifications for Design of Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements by : American Association of State Highway and Transportation Officials
Download or read book Guide Specifications for Design of Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements written by American Association of State Highway and Transportation Officials and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "These guide specifications are intended for use in the repair and strengthening of reinforced and prestressed concrete highway bridge elements using externally bonded fiber-reinforced polymer (FRP) composite systems. The guide specifications have been updated to better align with ACI 440 strain approaches, and major updates include the following: flanged sections in flexure, prestressed concrete sections, inclusion of factors to account for environmental exposure conditions, near surface mounted (NSM) FRP designs, design of end anchors, detailing of laps and splices, updated approach to FRP concrete interface strain, and inclusion of design examples for shear and flexural strengthening, and confinement. These updated guide specifications also contain detailed design examples, reflecting the latest research and lessons learned from actual field deployments."--Publisher website
Book Synopsis The Economic Impact of Implementing Nondestructive Testing of Reinforced Concrete Bridge Decks in Indiana by : Benjamin Taylor
Download or read book The Economic Impact of Implementing Nondestructive Testing of Reinforced Concrete Bridge Decks in Indiana written by Benjamin Taylor and published by . This book was released on 2016-12-31 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The deck is among the most expensive components of a bridge over its lifetime because of the frequent and costly maintenance and rehabilitation required. Currently, the Indiana Department of Transportation (INDOT) performs visual inspections of a bridge deck as the principal means of determining its condition, which enables the inspector to definitively document the surface condition while the unseen condition below the deck surface is left to the inspector's expert judgement. To compensate for this lack of data, INDOT supplements visual inspections with programmatic scheduling for major work actions, which is very effective for INDOT but costly. In this continuing era of funding shortfalls, INDOT commissioned this study to investigate nondestructive testing (NDT) methods to fill their data gap to inform its work action decision. The NDT methods have been shown to accurately locate corrosion and delamination and are a cost-effective alternative. A project level comparison between the NDT methods was performed to show which method, as well as which combination of methods, were the best choices from a cost perspective. A project level analysis of 30 bridge decks was performed, and those costs were compared to the costs of the current INDOT programmatic schedules. Finally, the analysis was expanded to the network level, which included the entire bridge inventory in Indiana. The results of this study indicate that implementing the NDT methods is cost-effective for INDOT at both the project and network levels.
Book Synopsis Guide Specifications for Design of Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements by :
Download or read book Guide Specifications for Design of Bonded FRP Systems for Repair and Strengthening of Concrete Bridge Elements written by and published by . This book was released on 2012 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: These guide specifications are intended for the repair and strengthening of reinforced and pre-stressed highway bridge structures using externally bonded fiber-reinforced polymer (FRP) composite systems. They supplement the AASHTO LRFD Bridge Design Specifications.
Book Synopsis Characterization and Modeling of Long-term Behavior of Frp-to-concrete Interface in Aggressive Environments by : Shahrooz Amidi
Download or read book Characterization and Modeling of Long-term Behavior of Frp-to-concrete Interface in Aggressive Environments written by Shahrooz Amidi and published by . This book was released on 2015 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced plastics (FRP) composites have emerged as one the foremost structural materials in retrofit/rehabilitation of concrete structural members in last decades. The long-term durability of the FRP-to-concrete interface in aggressive environments places a critical role in the success of this technique. A comprehensive program using both the analytical and experimental approaches has been carried out in this study to examine the integrity and long-term durability of the FRP-to-concrete interface in presence of aggressive environments. Novel analytical solutions based on three-parameter elastic/viscoelastic foundation models have been developed for adhesively bonded joints first in this study to gain better understanding of stress transfer through FRP-to-concrete interface. These models overcome drawbacks in existing models by satisfying all boundary conditions and producing different peel stress distributions along two adhesive-adherend interfaces, making it possible to accurately predict the location of debonding initiation. These models have been verified with finite element analysis and experimental observations. Comprehensive experimental programs have been carried out to evaluate the deterioration of the FRP-to-concrete induced by moisture. In the first part, a novel environment-assisted subcritical debonding method using a wedge driving test has been proposed to examine the synergistic effect of the mechanical loads and environmental conditions on the deterioration of the FRP-to concrete interface. The deterioration of the interface induced by water has also been evaluated through measuring the residual fracture toughness of the FRP-to-concrete interface conditioned in water through two different ways. It has been found that conditioning method can have significant effect on the testing results. A novel wedge-split test has been proposed and carried out to directly measure the traction-separation law of the epoxy-concrete interfaces under mode I loading, which is not available in the literature. The potential of using silane coupling agent to improve the durability of the FRP-to-concrete interface has also been examined in the experimental program. Testing results confirm that the residual fracture toughness of the FRP-to-concrete interface attacked by moisture can be significantly increased by silane treatment.
