Download or read book Degradation of the Residual Strength of Concrete written by Syed Asad Ali Gillani and published by . This book was released on 2017 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is devoted to the study of the debonding of thin bonded cement-based overlays from the concrete substrate under mechanical loading. As repair materials, fiber-reinforced and rubbberized cement-based mortars are used. Under these conditions, assessment of durability of the repairs necessarily involves the study of the degradation of the bridging strength under fatigue loading. In this context, tensile fatigue tests controlled by crack mouth opening displacement (CMOD) are conducted on composite specimens in order to establish the degradation law of fiber-reinforced and/or rubberized mortar. The bridging strength decreases with the number of fatigue cycles for the same maximum crack width, whatever the nature of the composite. The maximum cyclic bridging strength degradation occurs in plain mortar. The cyclic bridging strength degradation for large pre-cracked widths is limited for mortar reinforced with metallic fibers. In case of rubberized mortar, cyclic bridging strength degradation is limited at less pre-cracked width values. A combine use of rubber aggregates and fibers in mortar appeared to be a suitable solution to limit the cyclic bridging strength degradation for a wide range of pre-cracked widths. It confers to the composite an interest for durable application such as cement-based thin bonded overlays. Taking into account the main cause of distress in thin bonded cement-based applications i.e. cracking and interface debonding, different surface preparation techniques were evaluated in this research. Among them, the sandblasting one is usually implemented in actual conditions. In order to investigate the structural performance, composite beams consisting of a thin repair layer on top of sandblasted substrates are subjected to three point bending tests (monotonic and fatigue). For monitoring the evolution of cracking in the repair layer and of debonding at interface, digital 3D image correlation technique is used. It emerges as a conclusion that the rubber aggregates incorporation in repair material is helpful to control micro-cracking, which results in the delay of the debonding initiation. Moreover, a fiber-reinforcement of repair material is also helpful to limit the interface debonding propagation by restraining opening of the crack. So, the dual-use of rubber aggregates and fibers in the repair material of thin bonded cement-based overlays can be a suitable solution to delay the debonding initiation and also to limit the interface debonding propagation. This shows that the synergetic effect provided by the combine use of rubber aggregates and fibers remains valid under fatigue loading also. The used rubber aggregates are obtained by grinding end-of-life tyres. In such conditions, the approach brings an added value, the recycling of this industrial by-product being also a contribution to the maintenance of a clean environment. Incidentally, this approach also helps towards the development of a circular economy.

Download or read book Degradation of the Residual Strength of Concrete written by Syed Asad Ali Gillani and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work is devoted to the study of the debonding of thin bonded cement-based overlays from the concrete substrate under mechanical loading. As repair materials, fiber-reinforced and rubbberized cement-based mortars are used. Under these conditions, assessment of durability of the repairs necessarily involves the study of the degradation of the bridging strength under fatigue loading. In this context, tensile fatigue tests controlled by crack mouth opening displacement (CMOD) are conducted on composite specimens in order to establish the degradation law of fiber-reinforced and/or rubberized mortar. The bridging strength decreases with the number of fatigue cycles for the same maximum crack width, whatever the nature of the composite. The maximum cyclic bridging strength degradation occurs in plain mortar. The cyclic bridging strength degradation for large pre-cracked widths is limited for mortar reinforced with metallic fibers. In case of rubberized mortar, cyclic bridging strength degradation is limited at less pre-cracked width values. A combine use of rubber aggregates and fibers in mortar appeared to be a suitable solution to limit the cyclic bridging strength degradation for a wide range of pre-cracked widths. It confers to the composite an interest for durable application such as cement-based thin bonded overlays. Taking into account the main cause of distress in thin bonded cement-based applications i.e. cracking and interface debonding, different surface preparation techniques were evaluated in this research. Among them, the sandblasting one is usually implemented in actual conditions. In order to investigate the structural performance, composite beams consisting of a thin repair layer on top of sandblasted substrates are subjected to three point bending tests (monotonic and fatigue). For monitoring the evolution of cracking in the repair layer and of debonding at interface, digital 3D image correlation technique is used. It emerges as a conclusion that the rubber aggregates incorporation in repair material is helpful to control micro-cracking, which results in the delay of the debonding initiation. Moreover, a fiber-reinforcement of repair material is also helpful to limit the interface debonding propagation by restraining opening of the crack. So, the dual-use of rubber aggregates and fibers in the repair material of thin bonded cement-based overlays can be a suitable solution to delay the debonding initiation and also to limit the interface debonding propagation. This shows that the synergetic effect provided by the combine use of rubber aggregates and fibers remains valid under fatigue loading also. The used rubber aggregates are obtained by grinding end-of-life tyres. In such conditions, the approach brings an added value, the recycling of this industrial by-product being also a contribution to the maintenance of a clean environment. Incidentally, this approach also helps towards the development of a circular economy.

Download or read book Computational Modelling of Concrete Structures written by Nenad Bicanic and published by CRC Press. This book was released on 2014-03-04 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt: The EURO-C conference series (Split 1984, Zell am See 1990, Innsbruck 1994, Badgastein 1998, St Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St Anton am Alberg 2014) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete and

Download or read book Durability of Concrete Structures written by J. M. P. Q. Delgado and published by Springer Nature. This book was released on 2021-03-10 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a collection of recent research works, related to structural stability and durability, service life, reinforced concrete structures, recycled materials, and sustainability with endogenic materials. Intended as an overview of the current state of knowledge, the book will benefit scientists, students, practitioners, lecturers and other interested parties. At the same time, the topics covered are relevant to a variety of scientific and engineering disciplines, including civil, materials and mechanical engineering.

Download or read book Mechanisms of Chemical Degradation of Cement based Systems written by K.L. Scrivener and published by CRC Press. This book was released on 1997-04-17 with total page 474 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deterioration of cement-based materials is a continuing problem, as it results in the substantial shortening of the lives of conventional concrete structures. The main costs result from poor performance and the need for early repair. With more advanced applications, where very long service lives are essential, such as the storage of nuclear waste, an understanding of the degradation processes in order to predict long term performance is very important. this book forms the proceedings of the latest Symposia at the Materials Research Society Autumn meeting in Boston.

Download or read book Lateral Drift of Reinforced Concrete Frames with Stiffness and Strength Degradation Subjected to Strong Ground Motions written by Hasan Aydın Peköz and published by . This book was released on 2007 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sulfate Attack on Concrete written by J. Marchand and published by CRC Press. This book was released on 2001-10-11 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sulfate Attack on Concrete provides a comprehensive reference to this important subject. It covers: a short history of concrete deterioration due to sulfate attack, the origin of sulfates in concrete, the importance of appropriate concrete processing, forms and physical-chemical mechanisms of concrete deterioration due to sulfates, preventative mea

Download or read book Residual Strength of Fiber reinforced Concrete written by Roberta L. Marstellar and published by . This book was released on 1996 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Civil Engineering and Urban Research Volume 2 written by Hazem Samih Mohamed and published by CRC Press. This book was released on 2023-03-28 with total page 820 pages. Available in PDF, EPUB and Kindle. Book excerpt: Civil Engineering and Urban Research collects papers resulting from the conference on Civil, Architecture and Urban Engineering (ICCAUE 2022), Xining, China, 24–26 June 2022. The primary goal is to promote research and developmental activities in civil engineering, architecture and urban research. Moreover, it aims to promote scientific information interchange between scholars from the top universities, business associations, research centers and high-tech enterprises working all around the world. The conference conducts in-depth exchanges and discussions on relevant topics such as civil engineering and architecture, aiming to provide an academic and technical communication platform for scholars and engineers engaged in scientific research and engineering practice in the field of urban engineering, civil engineering and architecture design. By sharing the research status of scientific research achievements and cutting-edge technologies, it helps scholars and engineers all over the world comprehend the academic development trend and broaden research ideas. So as to strengthen international academic research, academic topics exchange and discussion, and promote the industrialization cooperation of academic achievements.

Download or read book Experimental Determination of the Residual Compressive Strength of Concrete Columns Subjected to Different Fire Durations and Load Ratios written by Anjaly Nair and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The superior thermal property of concrete associated to its great capability of thermally insulating the embedded reinforcing steel rebar is the main reason for the good behavior of reinforced concrete structural elements in fire condition, compared to other construction materials. However, at elevated temperatures, concrete still undergoes changes in its mechanical and thermal properties, which mainly cause degradation of strength and may lead to the failure of the structure. Retrofitting is a desirable alternative to rehabilitate post-fire concrete structures. However, in order to ensure safe reuse of fire-exposed buildings and to adopt proper retrofitting methods, it is essential to evaluate the residual strength capacity of fire-damaged reinforced concrete structural elements. The focus of this experimental research study is to investigate the fire performance of reinforced concrete columns exposed to elevated temperatures that followed CAN/ULC-S101 standard fire, and then evaluate their residual compressive strengths after fire exposure. In order to effectively study the fire performance of such columns, eight identical 200 x 200 x 1500mm high reinforced-concrete column test specimens were subjected to two different durations of standard fire exposure (1 hour and 2 hours) while being loaded with two different axial load ratios (20% and 40% of the column ultimate design axial compressive load capacity). In a subsequent stage and after complete cooling down, residual compressive strength capacity tests were performed on the fire-exposed columns. Experimental results showed that the residual compressive strength capacity dropped to almost 50% and 30% of its ambient temperature capacity for the columns exposed to 1- and 2-hour fire durations, respectively. It was also noticed that the applied load ratio has less effect on the column's residual compressive strength compared to that of the fire duration.

Download or read book Alternative Materials for the Reinforcement and Prestressing of Concrete written by J.L. Clarke and published by CRC Press. This book was released on 1993-09-16 with total page 219 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of steel reinforcement in concrete is a major problem, with serious implications for structural integrity and durability particularly for bridges and marine structures. This new book provides a thorough overview of recent developments and applications in this area.

Download or read book Concrete Solutions written by Michael Grantham and published by CRC Press. This book was released on 2009-06-10 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete repair continues to be a subject of major interest to engineers and technologists worldwide. The concrete repair budget for the UK alone currently runs at some UKP 220 per annum. Some estimates have indicated that, worldwide, in 2010 the expenditure for maintenance and repair work will represent about 85% of the total expenditure in the construction field. It has been forecast that, in the same year in the USA, 50 billion dollars will be spent just for the restoration of deteriorated bridges and viaducts. An understanding of the latest techniques in repair and testing and inspection is thus crucial to the international construction industry. This book, with contributions from 34 countries, brings together the best in research, practical application, strategy and theory relating to concrete repair, testing and inspection, fire damage, composites and electro-chemical repair.

Download or read book Reliability Based Analysis and Design of Structures and Infrastructure written by Ehsan Noroozinejad Farsangi and published by CRC Press. This book was released on 2021-09-27 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increasing demand on improving the resiliency of modern structures and infrastructure requires ever more critical and complex designs. Therefore, the need for accurate and efficient approaches to assess uncertainties in loads, geometry, material properties, manufacturing processes, and operational environments has increased significantly. Reliability-based techniques help develop more accurate initial guidance for robust design and help to identify the sources of significant uncertainty in structural systems. Reliability-Based Analysis and Design of Structures and Infrastructure presents an overview of the methods of classical reliability analysis and design most associated with structural reliability. It also introduces more modern methods and advancements, and emphasizes the most useful methods and techniques used in reliability and risk studies, while elaborating their practical applications and limitations rather than detailed derivations. Features: Provides a practical and comprehensive overview of reliability and risk analysis and design techniques. Introduces resilient and smart structures/infrastructure that will lead to more reliable and sustainable societies. Considers loss elimination, risk management and life-cycle asset management as related to infrastructure projects. Introduces probability theory, statistical methods, and reliability analysis methods. Reliability-Based Analysis and Design of Structures and Infrastructure is suitable for researchers and practicing engineers, as well as upper-level students taking related courses in structural reliability analysis and design.

Download or read book RICE HUSK ASH INFLUENCE IN CEMENT CONCRETE written by Dr. Chandan Kumar Patnaikuni & Dr. Malleswara Rao Palli and published by Lulu Publication. This book was released on 2021-06-14 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt: INTRODUCTION In the pursuit of developing new comforts and luxuries the greedy modern man is unintentionally got entangled into several environmental problems. Once the solar energy arrives on the earth, the earth’s surface heats up and begins to emit terrestrial radiation back into the atmosphere. As carbon dioxide, water vapour, methane, nitrous oxide, ozone, chlorofluorocarbons (CFC’s) and some other minor gases are nearly opaque, they obstruct or trap the outgoing terrestrial radiation or heat and makes the globe warmer than it be otherwise [John Houghton, 1997].

Download or read book Concrete Solutions 2011 written by Michael Grantham and published by CRC Press. This book was released on 2011-09-08 with total page 870 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Concrete Solutions series of International Conferences on Concrete Repair began in 2003, with a conference held in St. Malo, France in association with INSA Rennes, followed by the second conference in 2006 ( with INSA again, at St. Malo, France), and the third conference in 2009 (in Padova and Venice, in association with the University of Pado

Download or read book Advances in Civil Engineering and Building Materials written by Shuenn-Yih Chang and published by CRC Press. This book was released on 2012-10-31 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Civil Engineering and Building Materials presents the state-of-the-art development in: - Structural Engineering - Road & Bridge Engineering - Geotechnical Engineering - Architecture & Urban Planning - Transportation Engineering - Hydraulic Engineering - Engineering Management - Computational Mechanics - Construction Technology - Building Materials - Environmental Engineering - Computer Simulation - CAD/CAE Emphasis was given to basic methodologies, scientific development and engineering applications. Advances in Civil Engineering and Building Materials will be useful to professionals, academics, and Ph.D. students interested in the above mentioned areas.

Download or read book Fatigue of Materials III written by Raghavan Srinivasan and published by Springer. This book was released on 2016-12-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented in the third international symposium titled Fatigue of Materials: Advances and Emergences in Understanding held during the Materials Science and Technology 2014 meeting. The book contains contributions from engineers, technologists, and scientists from academia, research laboratories, and industries. The papers are divided into six topical areas: Session 1: Aluminum Alloys Session 2: Ferrous Materials I Session 3: Ferrous Materials II Session 4: Composite Materials Session 5: Advanced Materials Session 6: Modeling The papers cover a broad spectrum of topics that represent the truly diverse nature of the subject of fatigue as it relates to the world of materials.