Effectiveness Of Ultrasonic Pulse Velocity And Impact Echo Ndt Techniques To Assess The Quality Of Concrete

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Effectiveness of Ultrasonic Pulse Velocity and Impact-echo Ndt Techniques to Assess the Quality of Concrete

Author : Shibli Russel Mohiuddin Khan
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (975 download)

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Book Synopsis Effectiveness of Ultrasonic Pulse Velocity and Impact-echo Ndt Techniques to Assess the Quality of Concrete by : Shibli Russel Mohiuddin Khan

Download or read book Effectiveness of Ultrasonic Pulse Velocity and Impact-echo Ndt Techniques to Assess the Quality of Concrete written by Shibli Russel Mohiuddin Khan and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The deterioration of concrete in structure is a result of several internal or external degradation mechanism and which results in distress of the structure i.e. decrease in strength and integrity of the structure. the state of distress is often hidden from view and is only evident at a stage where there is significant reduction in strength of the structure. defects are open introduced during construction and are viewed during in services life. Some deterioration is viewed physically in the early age or during the services life of the structure in terms of spalling, surface crack, swelling and honeycombing. This deterioration collectively or individually results in reducing the load carrying capacity in terms of the distress of the structure. In this project, the common defects in the concrete structures and mapping techniques by nondestructive test are presented. Among the various techniques of the nondestructived tests, the Ultrasonic Pulse Velocity (UPV) and DOCtor's impact echo were chosen for their effectiveness. The UPV is used to estimate the concrete strength, detecting flaws such as voids and cracks and also to investigate the effects of smaller diameter bar in the concrete. In detecting various sizea of voids by the Impact-echo test techiniques a format was suggested to identify the from the frequency spectrum. In the bridge condition assessment by nondestructive test techniques most common problem encountered were correlationof cube crushing strength to the UPV values, in order to determine residual strength of the structure in different enviromental conditions. also the other defects such as cracks and voids in the concrete, which does not have any standard guideline to identify them by theabove NDT techniques to use in the bridge condition assessment. This project has dealt with large number of specimens between the actual condition and those of the values given by the NDT results. A number of beam specimens were also cast with known defects in the concrete in order to obtain and suggest standard investigation procedure. 108 standard cubes with different grades and enviromental conditions were cast. Also eight beams and a slab were casting having known common defects. From the strength- UPV correlation nine numbers of regression equations were suggested. A standard transducer spacing has been suggested for detecting crack depth of to 50 to 125mm range. The effect of bar sizes on UPV test results was also obtained. Reinforced concrete slabs or decks having bar diameter greater than 10mm diameter will be affect the reading of UPV. Based on the obtained resuls a computer database system for NDT has been made to accomodate and fulfill necessary requirements of knowledge base system. Hence this knowledge base system will be used for bridge condition assessment.

Impact-echo

Author : Mary Sansalone
Publisher :
ISBN 13 :
Total Pages : 344 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Impact-echo by : Mary Sansalone

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:

ASSESSMENT EVALUATION OF STRUCTURE USING ADVANCED UNDISTRUCTIVE METHODS

Author : Dr. Ashad Ullah Qureshi
Publisher : Concepts Books Publication
ISBN 13 :
Total Pages : 77 pages
Book Rating : 4.8/5 (369 download)

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Book Synopsis ASSESSMENT EVALUATION OF STRUCTURE USING ADVANCED UNDISTRUCTIVE METHODS by : Dr. Ashad Ullah Qureshi

Download or read book ASSESSMENT EVALUATION OF STRUCTURE USING ADVANCED UNDISTRUCTIVE METHODS written by Dr. Ashad Ullah Qureshi and published by Concepts Books Publication. This book was released on 2022-06-01 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reinforced and pre-stressed concrete are widely used for the construction of infrastructures such as bridges, industrial structures, buildings, etc. Most of the time, the quality of the concrete mix is assumed to be guaranteed but due to the congestion of reinforcement and the quality control exercised during placing and vibrating, honeycombs and voids are likely to be present in the hardened concrete. The presence of voids leads to the early deterioration of concrete and corrosion also sets in. The corrosion of reinforcement causes damage to the cover concrete and also section loss in the area of steel. In the case of pre-stressed concrete members, the corrosion leads to a catastrophic failure without any warning. Hence, it becomes necessary to evaluate the condition of concrete using Non Destructive Techniques (NDT) and Partially Destructive Techniques (PDT). The Ultrasonic Pulse Velocity (UPV) method which is widely adopted till now gives the relative quality and integrity of concrete and is based on the transit time. The rebound hammer gives the quality of concrete in the cover zone based on the rebound number.

Effectiveness of NDTs for the Detection of Concrete Deterioration

Author : Norsuzailina Mohamed Sutan
Publisher : LAP Lambert Academic Publishing
ISBN 13 : 9783847370741
Total Pages : 60 pages
Book Rating : 4.3/5 (77 download)

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Book Synopsis Effectiveness of NDTs for the Detection of Concrete Deterioration by : Norsuzailina Mohamed Sutan

Download or read book Effectiveness of NDTs for the Detection of Concrete Deterioration written by Norsuzailina Mohamed Sutan and published by LAP Lambert Academic Publishing. This book was released on 2012-02-08 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focused on effectiveness of NDTs for detection of concrete deterioration or defects. Tests were performed to evaluate the feasibility of using Impact-Echo Method and Ultrasonic Pulse Velocity Test in detecting defect and determining its depth during the early age concrete (between days 3 to day 28). Tests were performed on two RC Slabs Grade 30 and 40 at day 3,7,14 and 28 with a fabricated void at a known location. Tests were also performed to examine theoretically the relationship between the porosity of concrete at each stage and different strength with the accuracy of void depth detected. Both methods could detect defect in specimens during the early age. However, in the determination of depth of defect, Impact-Echo Test gave more accurate results. It is concluded that both methods can be used to assess the in-situ properties of concrete or as means for quality control on site since both tests could detect defects from day 3 and the accuracy ranges 55.75% to 99.05% from day 3 to day 28.

Use of the Impact-echo Method in Nondestructive Measurements of the Thickness of New Concrete Pavements

Author : Gerardo G. Clemeña
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (1 download)

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Book Synopsis Use of the Impact-echo Method in Nondestructive Measurements of the Thickness of New Concrete Pavements by : Gerardo G. Clemeña

Download or read book Use of the Impact-echo Method in Nondestructive Measurements of the Thickness of New Concrete Pavements written by Gerardo G. Clemeña and published by . This book was released on 1995 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nondestructive impact-echo (IE) method offers a simple means for introducing compressional stress waves into a concrete element or slab and measuring the resonance frequencies associated with the reflections of the waves from any internal voids and the bottom of the slab. It is relatively effective for detecting internal voids or delaminations in concrete, which is the application for which it was developed. It may also be possible to use the method for indirect measurement of the thickness of a slab if the wave propagation velocity in the concrete is known. This study was conducted to determine whether the IE method, by itself, could replace the use of coring for quality-assurance measurements of the thickness of concrete slabs in newly built pavements. The results from tests conducted on three pavemems indicated that the wave velocity varied so much, not only between pavements but also within a pavement, that unacceptable errors can result when an average velocity is determined (through limited coring) for a pavemem and subsequently assumed for the entire pavement. To reduce the error to an acceptable level, the wave velocity at any test location must be measured to within an acceptable accuracy by another independent method. In pursuit of this approach, an indirect-transmission procedure based on ultrasonic (UT) measurement was incorporated and tested. This combined IE/UT procedure was able to measure thickness with absolute errors of 5 mm in one pavement and 7 mm in another, at a 90% probability. These results can be considered encouraging since the current procedure requires that the length of a core reported to the nearest 3 mm be the average of several measurements around the core and, in some cores, these measurements can have a spread of as much as 13 mm. In addition, it is expected that these errors can be reduced easily with the use of a transducer with a smaller contact face that would be less sensitive to roughness on the surface of grooved concrete pavements.

Smart Cities—Opportunities and Challenges

Author : Sirajuddin Ahmed
Publisher : Springer Nature
ISBN 13 : 9811525455
Total Pages : 888 pages
Book Rating : 4.8/5 (115 download)

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Book Synopsis Smart Cities—Opportunities and Challenges by : Sirajuddin Ahmed

Download or read book Smart Cities—Opportunities and Challenges written by Sirajuddin Ahmed and published by Springer Nature. This book was released on 2020-04-20 with total page 888 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises select proceedings of the International Conference on Smart Cities: Opportunities and Challenges (ICSC 2019). The book contains chapters based on urban planning and design, policies and financial management, environment, energy, transportation, smart materials, sustainable development, information technologies, data management and urban sociology reflecting the major themes of the conference. The contents focus on current research towards improved governance and efficient management of infrastructure such as water, energy, transportation and housing for sustainable development, economic growth, and improved quality of life, especially for developing nations. This book will be useful for academicians, researchers, and policy makers interested in designing, developing, planning, managing, and maintaining smart cities.

Rebound Hammer Test and Non Destructive Testing of Concrete

Author : Chetan Singh
Publisher : Chetan Singh
ISBN 13 :
Total Pages : 127 pages
Book Rating : 4./5 ( download)

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Book Synopsis Rebound Hammer Test and Non Destructive Testing of Concrete by : Chetan Singh

Download or read book Rebound Hammer Test and Non Destructive Testing of Concrete written by Chetan Singh and published by Chetan Singh. This book was released on with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rebound Hammer Test and Non Destructive Testing (NDT) of Concrete are essential techniques used in the assessment of the quality, durability, and structural integrity of concrete structures. This book provides a guide to the principles, applications, and techniques involved in these methods. The ndt test for concrete book starts by introducing the basic properties of concrete, its construction process, and the reasons why testing is crucial. It then delves into the various methods of NDT, including Ultrasonic Pulse Velocity, Ground Penetrating Radar, and Impact Echo, among others. The focus of the book, however, is on the Rebound Hammer Test, which is one of the most widely used NDT methods for concrete. The rebound hammer test book discusses the theory behind the Rebound Hammer Test, how it works, and the factors that affect its accuracy. It provides detailed guidance on how to perform the test correctly and interpret the results. The book also covers the limitations of the test and its potential sources of error. In addition to the technical aspects of the Rebound Hammer Test and NDT, the book also covers the practical applications of these methods. It discusses how these techniques can be used to assess the quality and durability of concrete structures, identify defects and damage, and plan maintenance and repair activities. The NDT book includes a glossary of key terms and concepts, as well as a comprehensive set of frequently asked questions to help readers understand the material better. Overall, this book is an essential resource for engineers, technicians, and researchers working in the field of concrete construction and maintenance. It provides a thorough understanding of the Rebound Hammer Test and NDT, including the practical applications and limitations of these methods.

Insight

Author :
Publisher :
ISBN 13 :
Total Pages : 1016 pages
Book Rating : 4.E/5 ( download)

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Book Synopsis Insight by :

Download or read book Insight written by and published by . This book was released on 1997 with total page 1016 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nondestructive Measurements Using Mechanical Waves in Reinforced Concrete Structures

Author : Stephen R. Sharp
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (883 download)

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Book Synopsis Nondestructive Measurements Using Mechanical Waves in Reinforced Concrete Structures by : Stephen R. Sharp

Download or read book Nondestructive Measurements Using Mechanical Waves in Reinforced Concrete Structures written by Stephen R. Sharp and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study evaluated various techniques that use mechanical waves for the evaluation of critical concrete properties, such as proper consolidation of the concrete during placement and strength development; changes in modulus; and the detection of cracks, voids, and delaminated regions. The methods evaluated were ultrasonic shear-wave tomography, ultrasonic pulse velocity, crosshole sonic logging, sonic echo-impulse response, spectral analysis of surface waves, and the use of an impact echo scanner on pavements and bridge structures. Ultrasonic shear-wave tomography can be successfully used to determine the major distressed areas in pavements. Crosshole sonic logging can detect voids in drilled shafts and can indicate concrete performance and quality. Sonic echo-impulse response can reliably detect voids but is not always able to establish a precise location because of the potential variability in wave velocity. However, it can still provide useful thickness or depth information. In addition, detection of distress is limited by the embedded length-to-diameter ratios of the foundation element being examined. The use of ultrasonic pulse velocity can improve the accuracy of sonic echo-impulse response measurements by providing the actual velocity of the concrete being evaluated. Use of the impact echo scanner can provide delamination data for structures with smooth surfaces. In addition to detecting the condition of the concrete elements, these methods can be used to help determine compliance with end-result specifications. Quality control and acceptance using end-result specifications requires at least three test results to determine variability, which can be easily obtained using nondestructive test methods. The results regarding spectral analysis of surface waves were promising, but additional validation work is required to determine the abilities of this technique to assess asphalt-overlaid concrete decks. This study showed that nondestructive mechanical wave methods can be successfully used in determining concrete quality and the extent of distress in concrete structures. The study recommended that these methods be used by the Virginia Department of Transportation for condition assessment. The next step is to continue collecting data on pavements and bridge structures using these techniques.

ACI Manual of Concrete Practice

Author : American Concrete Institute
Publisher :
ISBN 13 :
Total Pages : 994 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis ACI Manual of Concrete Practice by : American Concrete Institute

Download or read book ACI Manual of Concrete Practice written by American Concrete Institute and published by . This book was released on 2002 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook on Nondestructive Testing of Concrete

Author : V. M. Malhotra
Publisher : CRC Press
ISBN 13 : 0803120990
Total Pages : 389 pages
Book Rating : 4.8/5 (31 download)

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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.

Selected Water Resources Abstracts

Author :
Publisher :
ISBN 13 :
Total Pages : 808 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Selected Water Resources Abstracts by :

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the 2nd International Conference on Nondestructive Testing of Concrete in the Infrastructure

Author : Society for Experimental Mechanics
Publisher :
ISBN 13 : 9780912053523
Total Pages : 308 pages
Book Rating : 4.0/5 (535 download)

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Book Synopsis Proceedings of the 2nd International Conference on Nondestructive Testing of Concrete in the Infrastructure by : Society for Experimental Mechanics

Download or read book Proceedings of the 2nd International Conference on Nondestructive Testing of Concrete in the Infrastructure written by Society for Experimental Mechanics and published by . This book was released on 1996 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Evaluation of the Soniscope for Nondestructive Testing of Portland-cement Concrete Pavements

Author : George M. Pace
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (359 download)

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Book Synopsis Evaluation of the Soniscope for Nondestructive Testing of Portland-cement Concrete Pavements by : George M. Pace

Download or read book Evaluation of the Soniscope for Nondestructive Testing of Portland-cement Concrete Pavements written by George M. Pace and published by . This book was released on 1966 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the results obtained from the soniscope instrument for use in the nondestructive testing of portland-cement concrete pavements. Essentially, the instrument was tested to determine if consistent velocity measurements could be obtained with the transducers in a position vertical on the prestressed, reinforced, and plain concrete pavements. Also, of interest during the investigation was the maximum distance through portland-cement concrete for which consistent velocity measurements could be obtained. (Author).

Concrete International

Author :
Publisher :
ISBN 13 :
Total Pages : 624 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Concrete International by :

Download or read book Concrete International written by and published by . This book was released on 1995 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt:

ACI 228. 2R-13 Report on Nondestructive Test Methods for Concrete in Structures

Author : American Concrete Institute
Publisher :
ISBN 13 : 9780870318207
Total Pages : 82 pages
Book Rating : 4.3/5 (182 download)

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Book Synopsis ACI 228. 2R-13 Report on Nondestructive Test Methods for Concrete in Structures by : American Concrete Institute

Download or read book ACI 228. 2R-13 Report on Nondestructive Test Methods for Concrete in Structures written by American Concrete Institute and published by . This book was released on 2013 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: "A review is presented of nondestructive test (NDT) methods for evaluating the condition of concrete and steel reinforcement in structures. Methods discussed include visual inspection, stress-wave, nuclear, measurement of fluid transport properties, magnetic and electrical, infrared thermography, and ground-penetrating radar. The principle of each method is discussed and the typical instrumentation described. Testing procedures are summarized and the data analysis methods explained. The advantages and limitations of the methods are highlighted. This report concludes with a discussion of planning a NDT program. General information is provided for those faced with the tast of evaluating the condition of a concrete structure and who are considering the applicability of NDT methods to aid in that evaluation."--p. 1.

Testing Concrete. Determination of Ultrasonic Pulse Velocity

Author : British Standards Institute Staff
Publisher :
ISBN 13 : 9780580445842
Total Pages : 18 pages
Book Rating : 4.4/5 (458 download)

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Book Synopsis Testing Concrete. Determination of Ultrasonic Pulse Velocity by : British Standards Institute Staff

Download or read book Testing Concrete. Determination of Ultrasonic Pulse Velocity written by British Standards Institute Staff and published by . This book was released on 2004-10-13 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concretes, Reinforced concrete, Prestressed concrete, Cement and concrete technology, Ultrasonic testing, Sonic testing, Non-destructive testing, Ultrasonics, Velocity measurement, Test equipment, Accuracy, Transducers, Error correction, Testing conditions, Modulus of elasticity, Poisson ratio, Strength of materials, Correlation methods, Reinforcement, Flaw detection