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Qualitative Evaluation Of Cfrp Concrete Bond Using Non Destructive And Destructive Testing Methods
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Book Synopsis Qualitative Evaluation of CFRP-concrete Bond Using Non-destructive and Destructive Testing Methods by : Ankita Anil Lad
Download or read book Qualitative Evaluation of CFRP-concrete Bond Using Non-destructive and Destructive Testing Methods written by Ankita Anil Lad and published by . This book was released on 2019 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: CFRP (Carbon Fiber Reinforced Polymer) laminates have been used as externally bonded reinforcements for retrofitting and structural strengthening of concrete structures. The adequacy of the CFRP bonding highly depends on the bond integrity between the concrete and CFRP laminates. Considering the reliability of this bonding technique, premature debonding of laminates from the concrete substrate is a major concern. The bond performance may be influenced directly by various parameters; some of the parameters like surface wetness, surface preparation, presence of voids in concrete substrate and overhead versus on the top installation of CFRP laminate have been discussed in this study. During the installation of the composite system, the bond can be comprised due to poor workmanship or unsuitable environmental conditions; improper cure or installation or surface preparation can cause voids, inclusions, debonds and delamination at the CFRP-substrate level. In this study, assessment of the CFRP-concrete bond for beams strengthened in flexure was carried out. Non-Destructive evaluation methods using Ground Penetrating RADAR, Ultrasound Tomography, Thermography and Schmidt hammer were applied to detect possible disbonds between CFRP-Concrete interfaces. Ground Penetration RADAR was effective in finding the sub-surface defects that affect the bond quality, infrared thermography and ultrasound tomography could detect both surface and subsurface delamination. Further, destructive techniques were executed to determine the type of failure in the CFRP retrofitted beams to correlate it with the quality of the bond. This study may serve as a valuable reference for optimization and inspection of CFRP-Concrete bond at the interface, using Non-destructive testing devices for practical applications.
Book Synopsis Practicality and Capability of NDT in Evaluating Long-term Durability of FRP Repairs on Concrete Bridges by :
Download or read book Practicality and Capability of NDT in Evaluating Long-term Durability of FRP Repairs on Concrete Bridges written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer (FRP) repairs on concrete structures have become popular, but their long-term durability remains in question. The objective of this research project is to investigate the efficiency, practicality, and capability of non-destructive testing in assessing the durability of FRP repairs applied on concrete bridges that have been in service for some years. Three bridges were chosen as the best available case studies: (1) the Safe Bridge with sprayed FRP in British Columbia, (2) the St-Étienne-de-Bolton Bridge with four different FRP wrap products in Quebec, and (3) the Leslie Street Bridge with wrap carbon fiber reinforced polymer in Ontario. These structures represent a wide variation in severity of environmental exposure, length of time in service, type of strengthening, and type of FRP product. They also encompass flexural and shear strengthening of beams and strengthening of columns. Two non-destructive evaluation techniques, active infrared thermography and impact-echo, were chosen as the most suitable methods of bond evaluation. The results of these non-destructive techniques were compared with the actual bond strength for accuracy and consistency. To measure the actual integrity of the bond, direct mechanical pull-off tests were performed as a complementary semi-destructive method. Initial indications are that infrared thermography enables investigation of vast areas in a reasonably time-efficient manner and provides reliable qualitative results. Impact-echo is found to be ineffective in evaluating the FRP bond, as the method is incapable of assaying the material close to the impact surface. The direct mechanical pull-off test was found to be relatively accurate in providing quantitative results in environmentally mild testing conditions. Use of the direct mechanical pull-off test, in a small sample, as substantiation of the infrared thermography, significantly increases the reliability of the non-destructive technique. In general, infrared.
Book Synopsis Non-Destructive Evaluation of Reinforced Concrete Structures by : Christiane Maierhofer
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
Book Synopsis Quantitative Non-destructive Evaluation (NDE) of FRP Laminate-concrete Bond Strength by : Mina Riad
Download or read book Quantitative Non-destructive Evaluation (NDE) of FRP Laminate-concrete Bond Strength written by Mina Riad and published by . This book was released on 2019 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Repair and rehabilitation methods for civil infrastructure have become a topic of great interest to engineers. Fiber Reinforced Polymer (FRP) is considered as one of the most popular and practical solutions for strengthening and retrofitting of civil infrastructure. Several past studies indicated that significant increase in strength and stiffness can be achieved by using this technology. The FRP-concrete interface bond is critical in transferring stresses from the concrete surface to the FRP. However, the evaluation of the bond strength is still a challenging issue. To evaluate the bond strength using non-destructive techniques, 32 concrete beams strengthened with FRP using different parameters affecting the bond strength (surface roughness, voids, Epoxy type, Epoxy layers, FRP type, surface preparation, application direction and surface wetness) were tested. The experiment was conducted with the objective of determining the suitable non-destructive method to detect each of the parameters in study, determining the effect of each parameter in study on the bond strength between the concrete and the FRP and finally use finite element models to prepare a set of relationships graphs between each of the parameters in study and the bond strength. The test samples were scanned using ground generating radar (GPR), ultrasound tomography, Infrared camera and Schmidt hammer.
Download or read book ACI Materials Journal written by and published by . This book was released on 2003 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Evaluation of Concrete Strength Using Destructive and Non Destructive Testing Methods by : Paşa Kol
Download or read book Evaluation of Concrete Strength Using Destructive and Non Destructive Testing Methods written by Paşa Kol and published by . This book was released on 1996 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Application of Acousto-ultrasonic Technique in Evaluation of Bond Strength Between Composites and Concrete Substrates by : Stanley C. Stoll
Download or read book Application of Acousto-ultrasonic Technique in Evaluation of Bond Strength Between Composites and Concrete Substrates written by Stanley C. Stoll and published by . This book was released on 2009 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber reinforced polymer materials (composite FRP materials) to strengthen existing concrete structures continues to expand as our current infrastructure ages. However, one of the concerns when using FRP systems in this manner is the difficulty in determining the quality and strength of the bond between the concrete and FRP overlays. There appears to be a need for a reliable non-destructive testing (NDT) method that can directly determine the strength of this bond to ensure the structural performance of FRP-strengthened concrete systems. The goal of this research was to evaluate whether a non-destructive acoustoultrasonic parameters (AUP) evaluation method could be used to determine the shear strength of the bond between FRP systems and concrete substrates. Eighteen concrete beams were externally reinforced flexurally with carbon fiber reinforced polymers (CFRP) and glass fiber reinforced polymers (GFRP) and then non-destructively tested using the AUP procedures. The test beam specimens were then placed in a simply supported configuration and loaded to failure. Interfacial shear strengths obtained from the destructive testing were compared against AUP analysis results to determine if a correlation could be established. Both longitudinal and shear transducers were utilized to collect propagating stress waves; however, only the longitudinal transducer provided consistent correlations to interfacial shear strength values. The investigation concluded that the (AUP) analysis procedure can be used to determine the interfacial shear bond strength of both glass and carbon fiber reinforced concrete beam specimens with relatively good correlation to actual strength data.
Book Synopsis Handbook on Nondestructive Testing of Concrete by : V. M. Malhotra
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.
Book Synopsis Assessment of Defect Criticality and Non-destructive Monitoring in CFRP-rehabilitated Civil Structures by : Henning Kaiser
Download or read book Assessment of Defect Criticality and Non-destructive Monitoring in CFRP-rehabilitated Civil Structures written by Henning Kaiser and published by . This book was released on 2002 with total page 614 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Non-Destructive Evaluation (NDE) of Polymer Matrix Composites by : Vistasp M. Karbhari
Download or read book Non-Destructive Evaluation (NDE) of Polymer Matrix Composites written by Vistasp M. Karbhari and published by Elsevier. This book was released on 2013-06-30 with total page 729 pages. Available in PDF, EPUB and Kindle. Book excerpt: The increased use of polymer matrix composites in structural applications has led to the growing need for a very high level of quality control and testing of products to ensure and monitor performance over time. Non-destructive evaluation (NDE) of polymer matrix composites explores a range of NDE techniques and the use of these techniques in a variety of application areas.Part one provides an overview of a range of NDE and NDT techniques including eddy current testing, shearography, ultrasonics, acoustic emission, and dielectrics. Part two highlights the use of NDE techniques for adhesively bonded applications. Part three focuses on NDE techniques for aerospace applications including the evaluation of aerospace composites for impact damage and flaw characterisation. Finally, the use of traditional and emerging NDE techniques in civil and marine applications is explored in part four.With its distinguished editor and international team of expert contributors, Non-destructive evaluation (NDE) of polymer matrix composites is a technical resource for researchers and engineers using polymer matrix composites, professionals requiring an understanding of non-destructive evaluation techniques, and academics interested in this field. - Explores a range of NDE and NDT techniques and considers future trends - Examines in detail NDE techniques for adhesively bonded applications - Discusses NDE techniques in aerospace applications including detecting impact damage, ultrasonic techniques and structural health monitoring
Book Synopsis Evaluation of CFRP/concrete Bond Under Shear and Tension by : John Spain
Download or read book Evaluation of CFRP/concrete Bond Under Shear and Tension written by John Spain and published by . This book was released on 1997 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Infrared Thermography by : Raghu Prakash
Download or read book Infrared Thermography written by Raghu Prakash and published by BoD – Books on Demand. This book was released on 2012-03-14 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared Thermography (IRT) is commonly as a NDE tool to identify damages and provide remedial action. The fields of application are vast, such as, materials science, life sciences and applied engineering. This book offers a collection of ten chapters with three major sections - relating to application of infrared thermography to study problems in materials science, agriculture, veterinary and sports fields as well as in engineering applications. Both mathematical modeling and experimental aspects of IRT are evenly discussed in this book. It is our sincere hope that the book meets the requirements of researchers in the domain and inspires more researchers to study IRT.
Book Synopsis Combining Non-destructive Tests to Improve the Reliability of Evaluating Concrete Quality by : Afra Al Asri Mohammed Obied Dhaheri
Download or read book Combining Non-destructive Tests to Improve the Reliability of Evaluating Concrete Quality written by Afra Al Asri Mohammed Obied Dhaheri and published by . This book was released on 2017 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Non-destructive tests (NDT) are commonly used in construction to evaluate concrete quality for both existing structures and during construction. The reliability of these tests have been questioned. This thesis is concerned with evaluating concrete strength and durability using different non-destructive tests (NDT). Also, it focuses on applying different combination of NDT to predict the concrete strength and durability using regression models. The main objective of the study was to investigate how to improve the reliability of nondestructive tests NDT to evaluate the concrete quality by combining more than one NDT test for concrete mixtures commonly used in Al Ain city, United Arab Emirates. The concrete quality was evaluated by measuring strength and durability. Different tests were conducted like ultrasonic pulse velocity (UPV), surface rebound number (Rn) and core test for predicting the concrete strength, while surface resistivity (SR) was used to predict the durability. NDT were combined using regression models to predict the concrete strength and durability. The study developed several models to combine UPV and Rn to predict compressive strength based on individual results obtained from each test, choose the best model, and compare the predicted values to actual results. Several models were developed to combine UPV and SR to predict concrete durability assessed by the rapid chloride permeability test (RCPT). The developed models were examined to choose the superior one and evaluate the predicted values to the actual results. The developed models are expected to improve the reliability of predicting the concrete quality, strength and durability for concrete structures in Al Ain city. Also, it is expected to improve quality control in concrete production by using fast, cost-efficient and reliable NDT method.
Book Synopsis Non Destructive Testing Methods for Integrity Determination of Concrete Structures by :
Download or read book Non Destructive Testing Methods for Integrity Determination of Concrete Structures written by and published by . This book was released on 2003 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nondestructive Test Methods for Evaluation of Concrete in Structures by : ACI Committee 228--Nondestructive Testing of Concrete
Download or read book Nondestructive Test Methods for Evaluation of Concrete in Structures written by ACI Committee 228--Nondestructive Testing of Concrete and published by . This book was released on 1998 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Durability of Composites for Civil Structural Applications by : Institute of Materials, Minerals, and Mining
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 Thermosense ... written by and published by . This book was released on 2007 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
