Download or read book Development of a Flexural Bond Strength Test to Determine Environmental Degradation of Carbon Fiber reinforced Polymer CFRP Composites Bonded to Concrete written by Amber Lee Gartner and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Testing will be done on epoxy and composite samples to determine the individual components effect in the beam specimen degradation. Flexural tests will continue to be performed on beams exposed for different periods to confirm the strength reduction trend with exposure time and temperature.
Download or read book Durability of Composites for Civil Structural Applications written by Institute of Materials, Minerals, and Mining and published by Woodhead Publishing. This book was released on 2007-07-25 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides practising engineers, decision makers and students with a useful and fundamental guide to the use of FRP composites within civil and structural engineering. A P Mouritz, RMIT, Australia.
Download or read book Strengthening and Rehabilitation of Civil Infrastructures Using Fibre Reinforced Polymer FRP Composites written by L C Hollaway and published by Elsevier. This book was released on 2008-07-18 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: The repair of deteriorated, damaged and substandard civil infrastructures has become one of the most important issues for the civil engineer worldwide. This important book discusses the use of externally-bonded fibre-reinforced polymer (FRP) composites to strengthen, rehabilitate and retrofit civil engineering structures, covering such aspects as material behaviour, structural design and quality assurance.The first three chapters of the book review structurally-deficient civil engineering infrastructure, including concrete, metallic, masonry and timber structures. FRP composites used in rehabilitation and surface preparation of the component materials are also reviewed. The next four chapters deal with the design of FRP systems for the flexural and shear strengthening of reinforced concrete (RC) beams and the strengthening of RC columns. The following two chapters examine the strengthening of metallic and masonry structures with FRP composites. The last four chapters of the book are devoted to practical considerations in the flexural strengthening of beams with unstressed and prestressed FRP plates, durability of externally bonded FRP composite systems, quality assurance and control, maintenance, repair, and case studies.With its distinguished editors and international team of contributors, Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites is a valuable reference guide for engineers, scientists and technical personnel in civil and structural engineering working on the rehabilitation and strengthening of the civil infrastructure. - Reviews the use of fibre-reinforced polymer (FRP) composites in structurally damaged and sub-standard civil engineering structures - Examines the role and benefits of fibre-reinforced polymer (FRP) composites in different types of structures such as masonry and metallic strengthening - Covers practical considerations including material behaviour, structural design and quality assurance
Download or read book Engineered Materials Abstracts written by and published by . This book was released on 1995 with total page 688 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber reinforced plastic FRP Reinforcement for Concrete Structures written by Antonio Nanni and published by Elsevier Publishing Company. This book was released on 1993 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber reinforced plastic (FRP) composites for prestressed and non-prestressed concrete reinforcement has developed into a technology with serious and substantial claims for the advancement of construction materials and methods. Research and development is now occurring worldwide. The 20 papers in this volume make a further contribution in advancing knowledge and acceptance of FRP composites for concrete reinforcement. The articles are divided into three parts. Part I introduces FRP reinforcement for concrete structures and describes general material properties and manufacturing meth.
Download or read book Calibration of Bond Durability Factor for Externally Bonded CFRP Systems in Concrete Structures written by Jovan Tatar and published by . This book was released on 2013 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: Use of carbon fiber-reinforced polymer (CFRP) composites in civil infrastructure has shown an increase in the past two decades. Externally bonded CFRP materials (wet-layup and laminate) have found their application in repair of damaged concrete structures, particularly bridges. Lack of understanding and confidence in the long-term performance of externally bonded FRP systems in concrete structures still inhibits the use of FRP composites to repair bridges. The most significant issue with externally bonded FRP composites is their susceptibility to degradation when exposed to moisture. One method to gage this sensitivity to moisture is to accelerate the effect of the moisture by exposing the material to high heat and moisture. This research utilized small-beam specimens to study FRP-concrete bond performance when subjected to accelerated conditioning environments (immersion in water and exposure to high humidity at elevated temperatures). Small beams with bonded CFRP reinforcement were conditioned and then tested to failure under three-point bending. The bond strength index was determined by dividing the average conditioned strength by the average control strength.
Download or read book Analysis and Performance of Fiber Composites written by Bhagwan D. Agarwal and published by Wiley-Interscience. This book was released on 1990-10-08 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Having fully established themselves as workable engineering materials, composite materials are now increasingly commonplace around the world. Serves as both a text and reference guide to the behavior of composite materials in different engineering applications. Revised for this Second Edition, the text includes a general discussion of composites as material, practical aspects of design and performance, and further analysis that will be helpful to those engaged in research on composites. Each chapter closes with references for further reading and a set of problems that will be useful in developing a better understanding of the subject.
Download or read book ACI Manual of Concrete Practice written by American Concrete Institute and published by . This book was released on 2002 with total page 1102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ACI 440 2R 17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures written by ACI Committee 440 and published by . This book was released on 2017-04-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Environmental Durability of Bond Behaviour Between Steel and Carbon Fibre Reinforced Polymer written by Tien Cuong Nguyen and published by . This book was released on 2012 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the last three decades, many studies have proven the effective use of CFRP composites in strengthening and retrofitting steel structures. However, one of the main restrictions to more widespread use of CFRP in strengthening and rehabilitating steel structures has been the uncertainty in the durability of steel/CFRP adhesively-bonded systems. This is especially true when such systems are exposed to outdoor environments. The data reporting this issue in the literature is currently limited and thus a systematic investigation of the effects of outdoor environments are required.The outdoor environments mainly include temperature, moisture and ultraviolet.Temperature is a detrimental factor to the adhesive layer between steel and CFRP because it may reach the glass transition temperature (Tg) of the adhesive,leading to a rapid reduction in the bond strength. Moisture, as another aspect of the durability, by diffusion through the adhesive or transport along the oxide/adhesive interface or absorption through the porous adherend, can penetrate to the interfaces between the adhesive and the steel adherend. Once moisture has penetrated into the steel /CFRP systems, degradation can occur due to two types of degradation: the degradation of the adhesive itself, and the degradation of the adhesive/adherend interface. In terms of ultraviolet, although the Earth's atmosphere filters out most of the total solar radiation, 6% of the total solar radiant flux is ultraviolet radiation and is able to reach the Earth's surface. Ultraviolet radiation has a wavelength between 290 and 400 nm, and the energy created by these wavelengths can dissociate the molecule bonds inivmost polymers, leading to the degradation of polymeric materials. The degradation may range from mere surface discoloration to extensive loss of mechanical properties. It should be also mentioned that combining these degrading factors together with loading may cause a significant degradation in mechanical properties of steel /CFRP systems.Double strap joints were chosen to investigate the performance of steel/CFRP composite systems subjected to environmental effects. When a double strap joint is tensioned, the strain in the carbon fibres must develop directly from the bond between the metal and the fibre. In this way, the fundamental behaviour of the metal-fibre bond, including the maximum strength and the effective bond length, can be investigated under static load.In the present research, the first aim was to investigate the effects of elevated temperatures on the mechanical characteristics of steel /CFRP double strap joints. It was found that due to elevated temperatures, the joint failure mode changed from cohesion to CFRP and adhesive interface debonding. Effective bond length was found to rapidly increase. Finally, joint strength and stiffness significantly decreased with temperature especially when temperature reached above the glass transition temperature (Tg) of the adhesive. Based on the ultimate load prediction model developed by Hart-Smith for double lapjoints and kinetic modeling of the mechanical degradation of the adhesive, a mechanism-based model is proposed to describe the change of effective bond length, stiffness and strength degradation for steel/CFRP double strap joints at elevated temperatures.In the next part of the research, time factor was taken into account. By applying different load levels, the time-to-failure of the joints was monitored and analyzed. It was found that when temperature was close to or higher than Tg,the joint failure was time dependent. Based on the proposed temperature andtime-dependent material property models, the time dependence failure time of steel /CFRP double strap joints was well described.Next, the effects of long term exposure to UV and associated temperatures were investigated. It was shown that UV exposure does not influence the tensile strength of CFRP composites. The tensile strength of the adhesive reduced slightly while modulus showed significant increase after long term exposure.Although the tensile modulus of adhesive exposed to only thermal environment also increased, it is considerably less than that induced by UV exposure.The UV exposure also led to a decrease in joint strength but an increase in stiffness,caused by the temperature effect rather than the UV rays.The next stage of the research investigated the effects of sea water and moisture.It was shown that sea water appeared to reduce the joint strength and stiffness both by 20% after 1 year of exposure, and the joints exposed to combinations of temperature and humidity in the environmental chamber showed little decrease in joint strength and stiffness after 1000 h of exposure. A model was developed to predict the strength and stiffness degradation of the joints in sea-water and the results compared well with the experimental results.Finally, the effects of sustained load and curing were examined. It was found that the effects of sustained load were significant which could catastrophically cause joint failure when it was combined with cyclic temperature and humidity.Elevated curing of the steel /CFRP bonded joint helped to improve the mechanical performance of the joints at elevated temperatures and increased the time-to-failure of the joints. Partial safety factors proposed in design guidelines for FRP composites under environmental effects were used to evaluate the experimental results obtained, suggesting a very critical degradation of joint mechanical properties due to the environmental effects investigated in this study.
Download or read book Externally Bonded FRP Reinforcement for RC Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2001-01-01 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1996, the then CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. The Task Group consists of about 60 members, representing most European universities, research institutes and industrial companies working in the field of advanced composite reinforcement for concrete structures, as well as corresponding members from Canada, Japan and USA. Meetings are held twice a year and on the research level its work is supported by the EU TMR (European Union Training and Mobility of Researchers) Network "ConFibreCrete”. The work of fib TG 9.3 is performed by five working parties (WP): Material Testing and Characterization (MT&C) Reinforced Concrete (RC) Prestressed Concrete (PC) Externally Bonded Reinforcement (EBR) Marketing and Applications (M&A) This technical report constitutes the work conducted as of to date by the EBR party. This bulletin gives detailed design guidelines on the use of FRP EBR, the practical execution and the quality control, based on the current expertise and state-of-the-art knowledge of the task group members. It is regarded as a progress report since it is not the aim of this report to cover all aspects of RC strengthening with composites. Instead, it focuses on those aspects that form the majority of the design problems. several of the topics presented are subject of ongoing research and development, and the details of some modelling approaches may be subject to future revisions. as knowledge in this field is advancing rapidly, the work of the EBR WP will continue. Inspite of this limit in scope, considerable effort has been made to present a bulletin that is today’s state-of-art in the area of strengthening of concrete structures by means of externally bonded FRP reinforcement.
Download or read book Defects and Damage in Composite Materials and Structures written by Rikard Benton Heslehurst and published by CRC Press. This book was released on 2014-04-21 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: The advantages of composite materials include a high specific strength and stiffness, formability, and a comparative resistance to fatigue cracking and corrosion. However, not forsaking these advantages, composite materials are prone to a wide range of defects and damage that can significantly reduce the residual strength and stiffness of a structure or result in unfavorable load paths. Emphasizing defect identification and restitution, Defects and Damage in Composite Materials and Structures explains how defects and damage in composite materials and structures impact composite component performance. Providing ready access to an extensive, descriptive list of defects and damage types, this must-have reference: Examines defect criticality in composite structures Recommends repair actions to restore structural integrity Discusses failure modes and mechanisms of composites due to defects Reviews NDI processes for finding and identifying defects in composite materials Relating defect detection methods to defect type, the author merges his experience in the field of in-service activities for composite airframe maintenance and repair with indispensable reports and articles on defects and damage in advanced composite materials from the last 50 years.
Download or read book Durability of Fiber Reinforced Polymer FRP Composites for Construction written by and published by . This book was released on 1998 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Rain Forests written by Joanna Brundle and published by 'The Rosen Publishing Group, Inc'. This book was released on 2021-07-15 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wet and green and full of animal life, the world’s rain forests are very important to the overall health and well-being of our planet. However, they cover less than 5 percent of Earth’s surface, and many people don’t know much about them. In this book, readers will learn about all the different types of rain forests, where they’re located, and why they’re so important to our world. Full-color photos and maps show more about these interesting biomes, and fact boxes talk more about their intriguing inhabitants.
Download or read book Materials Design and Manufacturing for Sustainable Environment written by Santhakumar Mohan and published by Springer Nature. This book was released on 2021-02-06 with total page 909 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the select proceedings of the International Conference on Materials, Design and Manufacturing for Sustainable Environment (ICMDMSE 2020). The primary focus is on emerging materials and cutting-edge manufacturing technologies for sustainable environment. The book covers a wide range of topics such as advanced materials, vibration, tribology, finite element method (FEM), heat transfer, fluid mechanics, energy engineering, additive manufacturing, robotics and automation, automobile engineering, industry 4.0, MEMS and nanotechnology, optimization techniques, condition monitoring, and new paradigms in technology management. Contents of this book will be useful to students, researchers, and practitioners alike.
Download or read book Guide for the Design and Construction of Concrete Reinforced with Fiber Reinforced Polymer Bars written by ACI Committee 440 and published by . This book was released on 2003 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
