Download or read book Nondestructive Evaluation Techniques Using Impact generated Stress Waves in Concrete written by Won-Joon Song and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, non-destructive evaluation techniques using impact-generated stress waves for the measurement of longitudinal and the surface wave velocities and the surface wave transmission coefficient across a surface-breaking crack or a notch in concrete are developed.
Download or read book Impact echo written by Mary Sansalone and published by . This book was released on 1997 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Destructive Evaluation of Reinforced Concrete Structures written by Christiane Maierhofer and published by Elsevier. This book was released on 2010-07-27 with total page 631 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineers have a range of sophisticated techniques at their disposal to evaluate the condition of reinforced concrete structures and non-destructive evaluation plays a key part in assessing and prioritising where money should be spent on repair or replacement of structurally deficient reinforced concrete structures. Non-destructive evaluation of reinforced concrete structures, Volume 2: Non-destructive testing methods reviews the latest non-destructive testing techniques for reinforced concrete structures and how they are used.Part one discusses planning and implementing non-destructive testing of reinforced concrete structures with chapters on non-destructive testing methods for building diagnosis, development of automated NDE systems, structural health monitoring systems and data fusion. Part two reviews individual non-destructive testing techniques including wireless monitoring, electromagnetic and acoustic-elastic waves, laser-induced breakdown spectroscopy, acoustic emission evaluation, magnetic flux leakage, electrical resistivity, capacimetry, measuring the corrosion rate (polarization resistance) and the corrosion potential of reinforced concrete structures, ground penetrating radar, radar tomography, active thermography, nuclear magnetic resonance imaging, stress wave propagation, impact-echo, surface and guided wave techniques and ultrasonics. Part three covers case studies including inspection of concrete retaining walls using ground penetrating radar, acoustic emission and impact echo techniques and using ground penetrating radar to assess an eight-span post-tensioned viaduct.With its distinguished editor and international team of contributors, Non-destructive evaluation of reinforced concrete structures, Volume 2: Non-destructive testing methods is a standard reference for civil and structural engineers as well as those concerned with making decisions regarding the safety of reinforced concrete structures. - Reviews the latest non-destructive testing (NDT) techniques and how they are used in practice - Explores the process of planning a non-destructive program features strategies for the application of NDT testing - A specific section outlines significant advances in individual NDT techniques and features wireless monitoring and electromagnetic and acoustic-elastic wave technology
Download or read book Bridge Evaluation Repair and Rehabilitation written by A.S. Nowak and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Evaluation, repair and rehabilitation of bridges are increasingly important topics in the effort to deal with the deteriorating infrastructure. For example, in the United States about 40 percent of the nation's 570,000 bridges are classified, according to the Federal Highway Administra tion's (FHW A) criteria, as deficient and in need of rehabilitation and replacement. In other countries the situation is similar. FHW A estimates the cost of a bridge replacement and reha bilitation program at 50 billion dollars. The major factors that have contributed to the present situation are: the age, inadequate maintenance, increasing load spectra and environmental contamination. The deficient bridges are posted, repaired or replaced. The disposition of bridges involves clear economical and safety implications. To avoid high costs of replacement or repair, the evaluation must accurately reveal the present load carrying capacity of the struc ture and predict loads and any further changes in the capacity (deterioration) in the applicable time span. Accuracy of bridge evaluation can be improved by using the recent developments in bridge diagnostics, structural tests, material tests, structural analysis and probabilistic methods. There is a need for an international exchange of advanced experience to increase the research effi ciency. The Workshop is organized on the premise that the exchange of existing American and European experience in the area of bridge evaluation, repair and rehabilitation is beneficial for both parties involved.
Download or read book Non destructive Evaluation of Concrete Slabs Using the Impact Echo Methodology written by Andrew Joseph Golemba and published by . This book was released on 1999 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook on Nondestructive Testing of Concrete written by V. M. Malhotra and published by CRC Press. This book was released on 2004 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: Civil engineers will value this resource that examines the tools and techniques used to estimate the in-place strength on concrete, permeation properties that relate to potential durability, and the methods used to assess the internal condition of concrete and the corrosion activity of steel reinforcement.
Download or read book Advances in Nondestructive Evaluation written by Seung-Seok Lee and published by . This book was released on 2004 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nondestructive Evaluation of Plain and Polymer Concrete written by Ehsan Mahmoudabadi and published by . This book was released on 2014 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nondestructive measurement of the concrete strength is an important topic of research. Among different nondestructive testing (NDT) methods the ultrasonic pulse velocity (UPV) technique is the most popular method for concrete strength estimation. The device which is commonly used for finding this property is called "PUNDIT". Many studies have been conducted to find the relationship between the concrete strength and its UPV (ultrasonic pulse velocity) using this device. The purpose of this study is to gain a better understanding of nondestructive evaluation of plain and polymer concretes to determine their properties using a new method. To achieve this goal, instead of using PUNDIT an alternative method has been used to generate the ultrasonic waves. The main difference of this new method in comparison to the earlier methods followed by other researchers is that in this method a linear chirp signal with different frequencies is transmitted through the material unlike the single frequency signal as PUNDIT does. This new method is applied to both plain and polymer concrete samples. While measuring concrete strengths by the UPV method almost all researchers have neglected the effect of applied stress or load on the concrete member. When the specimen is tested under stress, its behavior is quite different from when it is tested without any load. In this investigation attempts have been made to properly incorporate the effect of the applied load on the strength prediction of plain and polymer concrete specimens from the UPV generated values. After applying the load on the specimen in multiple steps - at 20%, 40%, 60% and 80% of its failure strength - the time of flight (TOF) was measured for every loading step. From regression analyses the best equations which can be used to find the applied stress on the structure from the velocity values have been derived. Under cyclic loadings pre-existing cracks inside both conventional concrete and polymer concrete may grow and cause catastrophic failure of the structure. Structural failure under cyclic loading is also known as the fatigue failure. Another aim of this study is to investigate the behavior of plain and polymer concretes under the cyclic loading or fatigue. The specimens used for this study were subjected to compressive loads for different numbers of cycles. The applied load was gradually increased. After the loading- unloading cycles, nonlinear impact resonance acoustic spectroscopy (NIRAS) test was carried out on the samples using instrumented impact hammer. The degree of nonlinearity in the concrete specimens was measured by recording the shift in the resonance frequency as the impact energy increased. Experimental results from the conventional plain concrete and polymer concrete specimens were compared to investigate which type of concrete exhibits more nonlinear behavior under fatigue.
Download or read book In Situ Nondestructive Testing of Concrete written by and published by . This book was released on 1984 with total page 844 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances and Developments in NDE Techniques for Concrete Structures written by John S. Popovics and published by ASCE Publications. This book was released on 2003-01-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Special issue of the Journal of Materials in Civil Engineering, May/June 2003, Volume 15, Issue 3. This special issue contains 11 papers presentingØØthe latest developments in the practical application of nondestructive evaluation (NDE) techniques to civil engineering materials and structures. Modern civil engineering structures incorporate complicated multimaterial components that require special monitoring through sophisticated NDE, which must be drawn from a range of physical phenomena. With a focus on cutting-edge techniques, several papers deal with nondestructive void and corrosion detection of embedded post-tensioned cables on concrete elements. Other papers present research findings on NDE techniques for steel cables, early-age and mature reinforced-concrete elements, and fiber-composite sheets, where ultrasound, magnetism, infrared thermography, acoustic emission, and radar phenomena are applied.
Download or read book Recent Advances in Nondestructive Evaluation Techniques for Material Science and Industries written by Chiaki Miyasaka and published by . This book was released on 2004 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Collection of New Studies Using Existing and Proposed Techniques and Instrumentation for Nondestructive Testing and Analysis of Concrete Materials and Structures written by Shane Darrel Boone and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of studies were performed using existing and newly proposed techniques and instrumentation to further the understanding of nondestructive testing of concrete. A new combined stress wave propagation method was developed that combined the existing methods of the spectral analysis of surface waves, impact echo, and free-free resonant column experimental and analysis techniques. The method was used to determine the stiffness profile and location of embedded voids in a concrete tunnel lining modeled as a three layer concrete slab. A new equation was proposed that predicted the level of damage of concrete samples based on the functions of the change in first mode longitudinal frequency and the absorption of energy during cyclic loading to failure. During this study, new instrumentation was developed that aided in the dynamic stiffness measurements during the cyclic loading. A comparison of the static and dynamic Youngs modulus was performed. It was found that the ratio of these two moduli depend on a concretes strength and damping properties as well as the age of the specimen. A new equation was proposed using these three properties to determine the ratio of static to dynamic Youngs modulus. An experimental program was performed on samples of high performance self-consolidating concrete (HPSCC). The HPSCC exceeded expected values of strength and stiffness over that of regular high performance concrete. Finally, a comparison of prestress losses in prestressed bridge girders fabricated using the HPSCC was conducted. Prestress losses were measured and calculated using the American Association of State Highway and Transportation Officials (AASHTO) LRFD 2004 and 2007 Specifications. It was determined that the AASHTO LRFD 2007 Specifications most accurately predict the measured prestress losses.
Download or read book Testing of Concrete in Structures written by John H. Bungey and published by CRC Press. This book was released on 2006-09-27 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a comprehensive overview of the techniques involved in testing concrete in structures, Testing of Concrete in Structures discusses both established techniques and new methods, showing potential for future development, and documenting them with illustrative examples. Topics have been expanded where significant advances have taken place in the field, for example integrity assessment, sub-surface radar, corrosion assessment and localized dynamic response tests. This fourth edition also covers the new trends in equipment and procedures, such as the continuation of general moves to automate test methods and developments in digital technology and the growing importance of performance monitoring, and includes new and updated references to standards. The non-specialist civil engineer involved in assessment, repair or maintenance of concrete structures will find this a thorough update.
Download or read book Handbook on Nondestructive Testing of Concrete written by V.M. Malhotra and published by CRC Press. This book was released on 2003-12-29 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: Civil and structural engineering consultants engaged in quality control or investigations of hardened concrete need a comprehensive resource that explains the methods of determining strength and other performance characteristics. Handbook on Nondestructive Testing of Concrete, Second Edition answers this demand by providing a thorough analys
Download or read book Advances in Non Destructive Evaluation written by Shyamsunder Mandayam and published by Springer Nature. This book was released on 2022-04-11 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises the proceedings of the Conference and Exhibition on Non Destructive Evaluation (NDE 2020). The contents of the volume encompass a vast spectrum from Conventional to Advanced NDE including novel methods, instrumentation, sensors, procedures, and data analytics as applied to all industry segments for quality control, periodic maintenance, life estimation, structural integrity and related areas. This book will be a useful reference for students, researchers and practitioners.
Download or read book Structural Renovation in Concrete written by Zongjin Li and published by CRC Press. This book was released on 2009-02-03 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanisms by which buildings and infrastructures degrade are complex, as are the procedures and methods for inspection and for rehabilitation. This book examines the various problems caused by non-uniform deformation changes, poor durability, and natural and human disasters such as earthquakes and fire. Attention is given to the causes and mechanisms of the deterioration. General procedures and commonly used techniques for inspection and evaluation of existing infrastructures are introduced. The desk study, destructive test, and non-destructive test are discussed – in particular the newly developed non-destructive methods for deterioration monitoring. The book then moves on to conventional renovation techniques such as patch and steel plate strengthening, which meet the requirements of normal practice. Special attention is paid to compatibility between repair materials and degraded materials. Fibrous composite materials are then introduced as a basis for innovative repair techniques, and different fibre and matrix properties are outlined, as are newly developed inorganic binders as a matrix for fibrous composites. Finally, advanced rehabilitation techniques using fibrous composite are described. Fundamental issues such as bonding and failure mechanisms are then discussed in detail. Fibrous composite strengthening techniques for beam, wall, column and slabs are covered, including shear strengthening, flexural strengthening, and fillet winding, as are codes of practice for retrofitting with fibrous composites. This caters to students and academics world-wide and serves as a "tool book" for concrete and structural engineering professionals.
Download or read book Mechanics of Elastic Waves and Ultrasonic Nondestructive Evaluation written by Tribikram Kundu and published by CRC Press. This book was released on 2019-07-09 with total page 390 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: This book presents necessary background knowledge on mechanics to understand and analyze elastic wave propagation in solids and fluids. This knowledge is necessary for elastic wave propagation modeling and for interpreting experimental data generated during ultrasonic nondestructive testing and evaluation (NDT&E). The book covers both linear and nonlinear analyses of ultrasonic NDT&E techniques. The materials presented here also include some exercise problems and solution manual. Therefore, this book can serve as a textbook or reference book for a graduate level course on elastic waves and/or ultrasonic nondestructive evaluation. It will be also useful for instructors who are interested in designing short courses on elastic wave propagation in solids or NDT&E. The materials covered in the first two chapters provide the fundamental knowledge on linear mechanics of deformable solids while Chapter 4 covers nonlinear mechanics. Thus, both linear and nonlinear ultrasonic techniques are covered here. Nonlinear ultrasonic techniques are becoming more popular in recent years for detecting very small defects and damages. However, this topic is hardly covered in currently available textbooks. Researchers mostly rely on published research papers and research monographs to learn about nonlinear ultrasonic techniques. Chapter 3 describes elastic wave propagation modeling techniques using DPSM. Chapter 5 is dedicated to an important and very active research field – acoustic source localization – that is essential for structural health monitoring and for localizing crack and other type of damage initiation regions. Features • Introduces Linear and Nonlinear ultrasonic techniques in a single book. • Commences with basic definitions of displacement, displacement gradient, traction and stress. • Provides step by step derivations of fundamental equations of mechanics as well as linear and nonlinear wave propagation analysis. • Discusses basic theory in addition to providing detailed NDE applications. • Provides extensive example and exercise problems along with an extensive solutions manual.
