Download or read book Bond Behavior of Prestressed Reinforcement in Beams Constructed with Self consolidating Concrete written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bond and Flexural Behaviour of Self Consolidating Concrete Beams Reinforced and Prestressed with FRP Bars written by Slamah Krem and published by . This book was released on 2013 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Self consolidating concrete (SCC) is widely used in the construction industry. SCC is a high performance concrete with high workability and consistency allowing it to flow under its own weight without vibration and making the construction of heavily congested structural elements and narrow sections easier. Fiber reinforced polymer (FRP) reinforcement, with its excellent mechanical properties and non-corrosive characteristic, is being used as a replacement for conventional steel reinforcement. In spite of the wide spread of SCC applications, bond and flexural behaviour of SCC beams reinforced or prestressed with FRP bars has not been fully studied. Furthermore, the ACI 440.1R-06 equation for determining the development length of FRP bars is based on Glass FRP (GFRP) bars and may not be applicable for Carbon FRP (CFRP) bars. This research program included an experimental and analytical study to investigate the flexural and bond behaviour of SCC beams reinforced with FRP bars and SCC beams prestressed with CFRP bars.

Download or read book Design Production and Placement of Self Consolidating Concrete written by Kamal Henri Khayat and published by Springer Science & Business Media. This book was released on 2010-08-12 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dear Colleagues, We are pleased to organize the Sixth International RILEM Symposium on SCC and the Fourth North-American Conference on the Design and Use of SCC, held on Sept 26-29, 2010 in Montreal, Quebec, Canada. The RILEM series of symposia started in 1999 in Stockholm, followed by Tokyo in 2001, Reykjavik in 2003, Chicago in 2005, and Ghent in 2007 with a steadily increasing number of papers, participants, and interest from across the globe. Due to the growing success of SCC, regional conferences have been organized, such as the North-American Conference on the Design and Use of SCC held in Chicago in 2002, 2005, and 2008; the International Symposium on Design, Performance and Use of SCC held nd in Changsa, China in 2005 and in Beijing, China in 2009; as well as the 2 International Conference on Advances in Concrete Technology in the Middle East: SCC held in Abu Dhabi in 2009. It can be concluded that these regional Conferences and Symposia were highly successful and reached a far more international audience than anticipated. Nearly 100 papers were submitted for these proceedings from which the International Scientific Committee selected 37 contributions covering a wide range of timely and original subjects from around the world. We would like to acknowledge the input of the International Scientific Committee for providing critical input to guarantee high quality of these peer-reviewed proceedings. We invite you to explore a wealth of information in the electronic proceedings.

Download or read book Time dependent Properties of Prestressed Concrete Beams Constructed with High strength Self consolidating Concrete written by Elizabeth Genevieve Gaynor and published by . This book was released on 2005 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Developments in International Bridge Engineering written by Polat Gülkan and published by Springer Nature. This book was released on 2021-04-27 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on current challenges in bridge engineering faced by professionals around the globe, giving a special emphasis to recently developed techniques and methods for bridge design, construction and monitoring. Based on extended and revised papers selected from outstanding presentation at the Istanbul Bridge Conference 2018, held from November 5 – 6, 2018, in Istanbul, Turkey, and by highlighting major bridge studies, spanning from numerical and modeling studies to the applications of new construction techniques and monitoring systems, this book is intended to promote high standards in modern bridge engineering. It offers a timely reference to both academics and professionals in this field.

Download or read book Bond Strength of Self consolidating Concrete for Prestressed Concrete Applications written by Amgad F. Girgis and published by . This book was released on 2004 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Strand Corrosion in Prestressed Concrete Structures written by Lei Wang and published by Springer Nature. This book was released on 2023-08-23 with total page 261 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is an open access book. This book focuses on the durability problems of existing prestressed concrete (PC) structures caused by strand corrosion, clarifies the mechanical behavior of corroded prestressing strands, corrosion-induced cracking, bond degradation, prestress loss and structural performance deterioration, and proposes the corresponding prediction models. Its aim is to provide the knowledge, tools, and methods to understand the deterioration phenomena of PC structures. We hope that this text may be useful for those who work in the field of civil engineering. It is suitable for teachers and students majoring in civil engineering in universities, and researchers in the field of civil engineering. It is also suitable for practitioners of design institutes, construction units, supervising units and traffic management departments.

Download or read book Self consolidating Concrete for Precast Prestressed Concrete Bridge Elements written by Kamal Khayat and published by Transportation Research Board. This book was released on 2009 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Download or read book PCI Journal written by and published by . This book was released on 2008 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bond Behaviour of Reinforcement in Self compacting Concrete Normal Concrete and Sand rich Concrete Under Monotonic and Cyclic Loading written by Dirk Weiße and published by . This book was released on 2005 with total page 233 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Durability and Behavior of Prestressed Concrete Beams written by E. C. Roshore and published by . This book was released on 1971 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bond Behavior of High Performance Reinforcing Bars for Concrete Structures written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Bond between the concrete and the reinforcing steel is a major factor affecting the performance of reinforced concrete structures. Advances in material science led to the production of High Performance Steel that has enhanced corrosion resistance and higher strength compared to conventional Grade 60 steel. Such material can lead to more economical design reducing the material requirements for a particular project and expanding its life span. The objective of this research is to study the bond behavior of High Performance reinforcing bars for concrete structures and to evaluate the effect of different parameters believed to affect the bond characteristics. Twenty-two large scale reinforced concrete splice beams were constructed using No. 8 and No. 11 reinforcing bars, having different cross-sections with varying concrete compressive strengths and development lengths. The beams were tested using four point bending setup to provide a constant moment region over the splice zone. Test results indicate that stresses up 90 ksi can be achieved in the No. 8 bars and up to 70 ksi in the No. 11 bars without confinement; however, it is recommended to use transverse reinforcement to confine the High Performance bars in order to ensure ductility. These stresses can be evaluated at failure using a simple proposed equation. Test results were used to extend the current ACI Committee 408 equations to better predict the stresses in the High Performance Steel.

Download or read book Bond of Corroded Reinforcement in Partial Depth Repairs in Reinforced Concrete Elements written by Hisham Alabduljabbar and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The bond in a reinforcement concrete (RC) structure is represented by the force transfer between the reinforcing bar and the surrounding concrete. All the RC structures are designed to have a perfect bond between the reinforcing bar and the surrounding concrete. However, corrosion of the reinforcing bar in the RC members is one of the main reasons that affect the bond efficiency in RC member. The deterioration of bond in RC element leads to decrease the service life of the RC structure and may result in sudden failure. Most of the previous research focuses on repairing the corroded RC member with FRP wrapping without cleaning the corroded reinforcing bar. The present research investigated the bond behaviour of cleaned corroded reinforcing bar repaired with partial depth repair concrete, transverse reinforcement or fiber reinforced polymer (FRP) sheets. Thirty-six beam-end specimens and twenty-four lap splice beams were cast and tested under static loading. The beam-end dimensions were 600 mm in length, 500 mm in height and 250 mm in width and reinforced with 20M bar. The test variables considered for the beam-end specimens were: four corrosion levels (5%, 7.5%, 10% and 15% mass loss level) and compared with non-corroded bar. Also, four bonded lengths were studied (200 mm, 250 mm, 300 mm, and 350 mm). Moreover, four partial depth repair concrete were used (commercial prepackaged self-consolidating concrete (SCC1), another different commercial prepackaged self-consolidating concrete (SCC2), self-consolidating concrete that was mixed in place and had similar proportions to the monolithic mixes (SCC3) and normal concrete (NC) mix design was also cast in place and had exactly the same proportions as the monolithic mixes but was used as a partial depth repair). All of the partial depth repair concretes were compared with monolithic beam-end specimen. The lap splice beams dimensions were 2200 mm in length, 350 mm in height and 250 mm in width and reinforced with two 20M lap spliced bars in the tension zone of the constant moment region with 300 mm splice length. Also, the lap splice beams were reinforced with two 10M continuous bars in the compression zone. The test variables considered for the lap splice beams were: commercial prepackaged self-consolidating concrete extended with 50% of 13 mm coarse aggregate (SCC50) was used as the main partial depth repair. It should be mentioned that SCC50 was the same partial depth repair concrete (SCC2) used for the beam-end specimens. Also, Three lap splice beams repaired with commercial prepackaged self-consolidating concrete without coarse aggregate (SCC0) were also included to study the effect of coarse aggregate on bond behavior. The lap splice beams repaired with partial depth repair concrete were compared with monolithic lap splice beam. Moreover, two types of confinements were considered in the lap splice beams: transverse reinforcement and carbon fiber reinforced polymer (CFRP) sheets. Six lap spliced beams were confined with transverse reinforcement and six were wrapped with CFRP sheets. This research found that the average bond strength increased as the bar mass loss increased for all bonded lengths. As the bonded length increased, the average bond strength decreased and the corresponding bar slip increased. In the beam-end specimens, the average bond strength of monolithic beam-end specimens was higher than the average bond strength of all types of the partial depth repair regardless the compressive strength of concrete. That was mainly because of internal shear cracks at the interface between the partial depth repair and the substrate concrete. However, since there was not shear at the constant moment region in the lap splice beams, the lap splice beams repaired with partial depth repair concrete with similar properties of monolithic concrete and had higher concrete strength showed higher average bond strength than the monolithic lap splice beams. Although the partial depth repair concrete SCC0 had higher compressive strength than SCC50 and the monolithic concrete; it had the lowest average bond strength. That because the absence of the coarse aggregate in SCC0 led to a decreased splitting strength and reduced fracture energy; and so the average bond strength was decreased. All self-consolidating concrete (SCC) partial depth repairs showed better bonding than the normal concrete (NC) partial depth repair. The bond strength of beams repaired with FRP sheets was higher than that of the beams confined with transverse reinforcement. The transverse reinforcement increased the average bond strength and the corresponding slip by (15% - 29%) and (32% - 62%) compared to the unwrapped beams, respectively. However, the beams confined with FRP sheets showed an increase in the bond strength and the corresponding slip by (34 - 49%) and (56 - 260%) compared to the unconfined beams, respectively. A multiple linear regression analysis was conducted to predict the effect of mass loss level, bonded length and presence repair concrete on the average bond strength of beam-end specimens. Also, a model was calibrated to predict the average bond strength with increasing the mass loss level of the reinforcing bar of lap splice beams. Moreover, another model was used to allow the design engineers to estimate the bond stress distribution along the spliced reinforcing bars as the splitting crack propagated.

Download or read book Durability and Behavior of Prestressed Concrete Beams written by E. C. Roshore and published by . This book was released on 1967 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Concrete Textbook Volume 4 written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2010-06-01 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of the Structural Concrete Textbook is an extensive revision that reflects advances in knowledge and technology over the past decade. It was prepared in the intermediate period from the CEP-FIP Model Code 1990 (MC90) to fib Model Code for Concrete Structures 2010 (MC2010), and as such incorporates a significant amount of information that has been already finalized for MC2010, while keeping some material from MC90 that was not yet modified considerably. The objective of the textbook is to give detailed information on a wide range of concrete engineering from selection of appropriate structural system and also materials, through design and execution and finally behaviour in use. The revised fib Structural Concrete Textbook covers the following main topics: phases of design process, conceptual design, short and long term properties of conventional concrete (including creep, shrinkage, fatigue and temperature influences), special types of concretes (such as self compacting concrete, architectural concrete, fibre reinforced concrete, high and ultra high performance concrete), properties of reinforcing and prestressing materials, bond, tension stiffening, moment-curvature, confining effect, dowel action, aggregate interlock; structural analysis (with or without time dependent effects), definition of limit states, control of cracking and deformations, design for moment, shear or torsion, buckling, fatigue, anchorages, splices, detailing; design for durability (including service life design aspects, deterioration mechanisms, modelling of deterioration mechanisms, environmental influences, influences of design and execution on durability); fire design (including changes in material and structural properties, spalling, degree of deterioration), member design (linear members and slabs with reinforcement layout, deep beams); management, assessment, maintenance, repair (including, conservation strategies, risk management, types of interventions) as well as aspects of execution (quality assurance), formwork and curing. The updated textbook provides the basics of material and structural behaviour and the fundamental knowledge needed for the design, assessment or retrofitting of concrete structures. It will be essential reading material for graduate students in the field of structural concrete, and also assist designers and consultants in understanding the background to the rules they apply in their practice. Furthermore, it should prove particularly valuable to users of the new editions of Eurocode 2 for concrete buildings, bridges and container structures, which are based only partly on MC90 and partly on more recent knowledge which was not included in the 1999 edition of the textbook.

Download or read book Behavior of Prestressed Concrete Beams with CFRP Strands written by and published by . This book was released on 2016 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high cost of repairing reinforced or prestressed concrete structures due to steel corrosion has driven engineers to look for solutions. Much research has been conducted over the last two decades to evaluate the use of Fiber Reinforced Polymers (FRPs) in concrete structures. Structural engineering researchers have been testing FRP to determine their usability instead of steel for strengthening existing reinforced concrete structures, reinforcing new concrete members, and for prestressed concrete applications. The high strength-to-weight ratio of FRP materials, especially Carbon FRP (CFRP), and their non-corrosive nature are probably the most attractive features of FRPs. In this study, an experimental program was conducted to investigate the flexural behavior of prestressed concrete beams pre-tensioned with CFRP strands. The bond characteristics were examined by means of experimentally measuring transfer length, flexural bond length, and bond stress profiles. A total of four rectangular beams pre-tensioned with one 0.5-in. diameter CFRP strand were fabricated and tested under cyclic loading for five cycles, followed by a monotonically increasing load until failure. In investigating bond properties, the experimental results were compared to the equations available in the literature. The results from the four flexural tests showed that the main problem of CFRP strands, in addition to their liner-elastic tensile behavior, was lack of adequate bonding between FRP and concrete. Poor bonding resulted in early failure due to slippage between FRPs and concrete. As a result, a new technique was developed in order to solve the bonding issues and improve the flexural response of CFRP prestressed concrete beams. The new technique involved anchoring the CFRP strands at the ends of the concrete beams using a new "steel tube" anchorage system. It was concluded that the new technique solved the bond problem and improved the flexural capacity by about 46%. A computer model was created to predict the behavior of prestressed beams pre-tensioned with CFRP. The predicted behavior was compared to the experimental results. Finally, the experimental results were compared to the behavior of prestressed concrete beams pre-tensioned with steel strands as generated by the computer model. The CFRP beams showed higher strength but lower ductility.

Download or read book Evaluating the Bond Performance of Self consolidating Concrete in Prestressing Applications written by Robert J. Peterman and published by . This book was released on 2011 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results from strand end-slip measurements and load tests on 73 pretensioned members that were fabricated at six different PCI producer member plants. Sixty-seven of these beams utilized standard production concrete mixes and placement techniques. As such, the data presented in this report are believed to be representative of standard industry practice between 2005 and 2008. This study revealed that the top-bar effect for pretensioned strands is primarily the result of a small amount of concrete above the strand, rather than a large amount of concrete below the steel. Accordingly, the findings of this investigation indicate that the current design assumptions for bond in pretensioned members are largely un-conservative for members with strands located near the top (as-cast) surface. This phenomenon can result in extremely large transfer lengths for strands located within a few inches of the top surface, including those in shallow members. In addition, the top-cast strand effect typically becomes more pronounced when concrete fluidity is increased. However, these same findings also revealed that the current design assumptions for bond were generally satisfied when strands were located deeper in the members. This was true for both flowable concrete and self-consolidating concrete mixtures.