Download or read book Durability of Carbon Fibre Reinforced Polymer Concrete Bond Under Sustained Load in Harsh Environment written by Basim M. Mahdi Abbas and published by . This book was released on 2010 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon Fibre Reinforced Polymer (CFRP) has great potential in civil engineering applications. It is used extensively in extending the structural capacity or service life of aging structures. CFRP is one of the best alternatives to traditional retrofitting materials. It has a very high strength-to-weight ratio with good resistance to environmental effects. Together with the fibres, the adhesive and the substratum are the main constituents of the CFRP bonding systems. However, with high quality plated CFRP, the latter two components introduce some doubts about the system's performance. There is therefore a crucial research need to investigate the effects of environmental exposures on the system under loading conditions. In the present work, the effects of extreme environmental exposures on the bond properties between externally-applied carbon fibre reinforced polymer (CFRP) and concrete were investigated. Preloaded CFRP-concrete samples at various load intensities were exposed to several conditions. The exposure conditions were temperature cycles with humidity, constant temperature at increasing humidity, soaking in saline water at different temperatures, and different salt concentrations. Finally, actual extreme marine site environments including direct exposure to sunlight were explored. The change of bond characteristics between the externally-applied CFRP and concrete due to permanent loads, aging, and exposure conditions were used as measures of degradation effects. Other properties such as the development of the strain field with load, bond-slip relationships, detection of cracking intensity and location were evaluated using photogrammetry and acoustic emission techniques. Tensile pull-out and torsional shear strength were also explored. A Neural Network method was implemented for the prediction of bond strength and the expected failure of preloaded samples in different environments. The objective of the study was to understand the behaviour of preloaded concrete-CFRP bonding systems and evaluate the changes in the bond properties due to combinations of factors in harsh environments. It was found that high temperature and the combined aggressive site conditions were the major factors leading to sample failure.
Download or read book Composite Science and Technology written by S. M. Sapuan and published by . This book was released on 2011 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume is indexed by Thomson Reuters CPCI-S (WoS).This collection of more than 204 peer-reviewed papers on Composite Science and Technology covers: mechanics of composites, infrastructural composites, non-destructive evaluation and characterization of composites, fracture and fatigue of composites, numerical and mathematical modelling, ceramic matrices, composites, metal-matrix composites, composite manufacturing, polymer composites, smart materials and structures, nano-composites, bio-composites and structural health monitoring. This makes it a handy guide to the state-of-the-art of this field.
Download or read book Maintenance Safety Risk Management and Life Cycle Performance of Bridges written by Nigel Powers and published by CRC Press. This book was released on 2018-07-04 with total page 5447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Maintenance, Safety, Risk, Management and Life-Cycle Performance of Bridges contains lectures and papers presented at the Ninth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2018), held in Melbourne, Australia, 9-13 July 2018. This volume consists of a book of extended abstracts and a USB card containing the full papers of 393 contributions presented at IABMAS 2018, including the T.Y. Lin Lecture, 10 Keynote Lectures, and 382 technical papers from 40 countries. The contributions presented at IABMAS 2018 deal with the state of the art as well as emerging concepts and innovative applications related to the main aspects of bridge maintenance, safety, risk, management and life-cycle performance. Major topics include: new design methods, bridge codes, heavy vehicle and load models, bridge management systems, prediction of future traffic models, service life prediction, residual service life, sustainability and life-cycle assessments, maintenance strategies, bridge diagnostics, health monitoring, non-destructive testing, field testing, safety and serviceability, assessment and evaluation, damage identification, deterioration modelling, repair and retrofitting strategies, bridge reliability, fatigue and corrosion, extreme loads, advanced experimental simulations, and advanced computer simulations, among others. This volume provides both an up-to-date overview of the field of bridge engineering and significant contributions to the process of more rational decision-making on bridge maintenance, safety, risk, management and life-cycle performance of bridges for the purpose of enhancing the welfare of society. The Editors hope that these Proceedings will serve as a valuable reference to all concerned with bridge structure and infrastructure systems, including students, researchers and engineers from all areas of bridge engineering.
Download or read book Strengthening of Reinforced Concrete Structures written by L C Hollaway and published by Elsevier. This book was released on 1999-03-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into the possibility of using fibre reinforced polymer (FRP) materials in its place, providing a non-corrosive, more versatile strengthening system.This book presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforces polymer composite plates. It is based to a large extent on material developed or provided by the consortium which studied the technology of plate bonding to upgrade structural units using carbon fibre / polymer composite materials. The research and trial tests were undertaken as part of the ROBUST project, one of several ventures in the UK Government's DTI-LINK Structural Composites Programme.The book has been designed for practising structural and civil engineers seeking to understand the principles and design technology of plate bonding, and for final year undergraduate and postgraduate engineers studying the principles of highway and bridge engineering and structural engineering. - Detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforced polymer composites - Contains in-depth case histories
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 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 Glass Fibre Reinforced Polymer Composites written by Jalumedi Babu and published by Walter de Gruyter GmbH & Co KG. This book was released on 2020-05-05 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are engineered materials, made from two or more constituents with significantly different physical or chemical properties which remain separate on a macroscopic level within the finished structure. Due to their special mechanical and physical properties they have the potential to replace conventional materials.
Download or read book Hydraulic and Civil Engineering Technology VIII written by M. Yang and published by IOS Press. This book was released on 2023-12-21 with total page 1528 pages. Available in PDF, EPUB and Kindle. Book excerpt: All of us are dependent on a built environment constructed and maintained by civil and hydraulic engineers, and for those working in these fields, keeping up to date with the latest technological developments is vital for the safe and efficient design and operation of this infrastructure. This book presents the proceedings of HCET 2023, the 8th International Technical Conference on Frontiers of Hydraulic and Civil Engineering Technology, held from 25-27 September 2023 in Wuhan, China. HCET is an international conference which aims to enhance the development of hydraulic and civil engineering in China, with a focus on high-end, intelligent and green technologies. It seeks to do this by consolidating global wisdom and achievements and providing scientific support. HCET also offers an excellent opportunity for scientists, researchers and engineers from around the world to exchange their findings and discuss developments, establishing a basis for national and international collaboration. A total of 316 contributions were received for the 2023 edition, of which 187 were ultimately accepted after a rigorous review process and checks for quality and plagiarism. Topics covered include the research and development of concrete structure design and analysis; structural mechanics and structural engineering; building and future materials; hydraulic engineering; geological exploration and earthquake engineering; building technology; urban planning; road, bridge and traffic engineering; energy infrastructure; environmental engineering and advanced engineering technologies, and interdisciplinary sciences and applications. Covering a wide range of subjects related to hydraulic engineering and civil engineering technology and associated transdisciplinary sciences, the book will be of interest to all those working in the field.
Download or read book Fire Properties of Polymer Composite Materials written by A. P. Mouritz and published by Springer Science & Business Media. This book was released on 2007-01-30 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first to deal with the important topic of the fire behaviour of fibre reinforced polymer composite materials. The book covers all of the key issues on the behaviour of composites in a fire. Also covered are fire protection materials for composites, fire properties of nanocomposites, fire safety regulations and standards, fire test methods, and health hazards from burning composites.
Download or read book Nonconventional Concrete Technologies written by Committee on Nonconventional Concrete Technologies for Renewal of the Highway Infrastructure and published by National Academies Press. This book was released on 1997-04-08 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonconventional Concrete Technologies: Renewal of the Highway Infrastructure identifies research and development opportunities in innovative, nonconventional materials and processes that have the potential to accelerate the construction process, improve the durability of highway pavement and bridges, and enhance the serviceability and longevity of new construction under adverse conditions.
Download or read book Durability of Carbon Fiber Reinforced Polymer CFRP Repair strengthening Concrete Beams written by Jiangang Deng and published by ProQuest. This book was released on 2008 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon fiber-reinforced polymers (CFRP) have been widely used as externally epoxy-bonded reinforcement for repair and retrofit of existing concrete structures. As the use of CFRP in construction increases, it is essential to consider the long term behavior. In this study, concrete specimens with externally bonded CFRP composite systems were exposed to various accelerated ageing environments: different elevated temperature water immersion, varying relative humidity exposure, real-time solar exposure, pressurized hygrothermal exposure, and fatigue loading. Three-point loading test and direct tension test were used to evaluate the flexural and tensile strength of CFRP specimens. This research recommends that the durability strength reduction factor be defined as the ratio of the flexural strength of a test specimen after exposure for 60 days at 60C to the strength of a control specimen at the initiation of exposure. Test specimens, exposure environments, testing procedures, and field application environments are selected to assure uniform reporting, testing and application of durability strength reduction factors. Two exposure environments are recommended for design, wet and air. Water can diffuse through concrete and accumulate on the epoxy/concrete interface in a wet environment and is the default condition for design. An air environment precludes water accumulation but requires engineering design and validation to guarantee compliance. The resulting durability strength reduction factor may be used to (a) calculate the reduced strength for environmental exposure, (b) qualify a specific CFRP system, (c) compare durability reduction factors to those provided by system suppliers, and (d) confirm compliance with project specifications.
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:
Download or read book Time Dependent Behaviour of Concrete Structures written by Raymond Ian Gilbert and published by CRC Press. This book was released on 2010-09-15 with total page 447 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serviceability failures of concrete structures involving excessive cracking or deflection are relatively common, even in structures that comply with code requirements. This is often as a result of a failure to adequately account for the time-dependent deformations of concrete in the design of the structure. The serviceability provisions embodied in
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 Durability of Wet bond Between Hybrid FRP Laminate and Cast in place Concrete written by Li Li and published by . This book was released on 2007 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book International Congress on Polymers in Concrete ICPIC 2018 written by Mahmoud M. Reda Taha and published by Springer. This book was released on 2018-04-06 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume collects the proceedings from the International Congress of Polymers in Concrete 2018 (ICPIC), held under the theme “Polymers for Resilient and Sustainable Concrete Infrastructure.” ICPIC 2018 provides an opportunity for researchers and specialists working in the fields of polymers to exchange ideas and follow the latest progress in the use of polymers in concrete infrastructure. It also showcases the use of polymers and polymer concrete in sustainable and resilient development, and provides a platform for local and overseas suppliers, developers, manufacturers and contractors using polymers, polymer concrete and polymer composites in concrete structures to develop new business opportunities and follow the latest developments in the field. The International Congress of Polymers in Concrete is an international forum that has taken place every three years for the last 40 years with the objective of following progress in the field of polymers and their use in concrete and construction. Following 15 successful congresses held in London (1975), Austin (1978), Koriyama (1981), Darmstadt (1984), Brighton (1987), Shanghai (1990), Moscow (1992), Oostende (1995), Bologna (1998), Honolulu (2001), Berlin (2004), Chuncheon (2007), Funchal (2010), Shanghai (2013) and Singapore (2015), the 16th ICPIC will take place in Washington, DC, from April 29 to May 1st, 2018.
Download or read book Reinforced Concrete Design with FRP Composites written by Hota V.S. GangaRao and published by CRC Press. This book was released on 2006-11-20 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the use of composites has increased in many industrial, commercial, medical, and defense applications, there is a lack of technical literature that examines composites in conjunction with concrete construction. Fulfilling the need for a comprehensive, explicit guide, Reinforced Concrete Design with FRP Composites presents specific informat
