Buchinski case histories of the application of stresswave methods, such as impact echo, impulse response, and spectral analysis of surface waves, to evaluate conditions of concretelined tunnels and shafts are presented. Imaging methods of concrete structure based on impactecho test 239 the test mesh on the specimen is a 76 cm. Amethodforflaw detectioninconcreteusing transientstresswaves marysansalone nicholasj. Pdf the impactecho method is a technique for flaw detection in concrete. Alternatively three sensor configurations are available for use with the freedom data pc or nde 360. Impact echo is a method for nondestructive evaluation of concrete and masonry structures, based on the use of impact generated stress sound waves that propagate through a structure and are reflected by internal flaws and external surfaces. Test standards astm standard c8398a for measuring the pwave speed and thickness of concrete plates using the impact echo method aci 228. In echo methods a stress pulse is introduced into the test medium at an accessible surface by a transducer or by mechanical impact. Among these factors were the steel impactor size, accuracy related to the data acquisition, distance between the impact point and the transducer and the location of the test point. This article appeared in a journal published by elsevier. Impact echo test equipment configurations the ctg2 is a dedicated system used for impact echo concrete thickness measurement and concrete defect analysis exclusively.
The final report presents the results of an experimental and computational study on the recentlydeveloped aircoupled impact echo ie nondestructive testing ndt method, in which microphones replace the traditional physicallycoupled ie sensors. The principal components of a test system are a cylindrical handheld. Jun 04, 2012 test standards astm standard c8398a for measuring the pwave speed and thickness of concrete plates using the impact echo method aci 228. The testing equipment consists of an impact source and a receiver displacement or velocity transducer, or accelerometer. Impactecho mirador incorporates innovative techniques to create 2dimensional 2d and 3dimensional 3d visual representations of the results of impactecho tests obtained from a grid of closelyspaced test points. Top delamination test resu lts from the impact echo top, gpr middle and acoustic sounding va deck 0 4 8 12 bridge deck scanner summary impact echo scanning had the most resolution of top delaminations on concrete bridges ie identified bottom delaminations as well as profiling deck thickness echoes. Jan 12, 2017 nondestructive tests of thickness measurement for concrete. It also introduces the software, impact e, used with impact echo test systems made by impact echo instruments, llc. The impact echo results show that the density of the primary barrier ranged from 2. Vucon system impact echo system for field evaluation of. Departmentofcommerce nationalbureauofstandards nationalengineeringlaboratory centerforbuildingtechnology structuresdivision gaithersburg,md20899 september1986 u. Pundit pd8000, the wireless inspection solution with multichannel ultrasonic pulse echo technology, brings onsite structural concrete assessment and imaging to the next level when it comes to pragmatism and productivity. Ndt of thickness measurement for concrete fprimec solutions. Evaluation of a concrete building using impact echo.
Effectiveness of impact echo testing in detecting flaws in prestressed concrete slabs. Impact echo is the industry standard in nondestructive testing. Jun 09, 2018 this video animation, animated video explains the concept of impact echo test for concrete. In order to improve the impact echo method and to visually identify locations of reflectors, a new procedure has been developed by applying an imaging procedure to the data, as stack imaging of spectral amplitudes based on impact echo sibie. Oct 03, 2017 impact echo test non destructive testing. Impact echo mirador incorporates innovative techniques to create 2dimensional 2d and 3dimensional 3d visual representations of the results of impact echo tests obtained from a grid of closelyspaced test points. Experimental determination of detection limits of impact echo. Astm c83 15 standard test method for measuring the pwave.
Impact echo testing consists of measuring both the time record. Bem analysis of dynamic behavior of concrete in impact. Bem analysis of dynamic behavior of concrete in impactecho test. Concrete science conducted the impact echo testing on the suspect walls. Finally, the accuracy of the impactecho method for concrete pavement applications was studied. Pdf experimental determination of detection limits of. In each test, the impact source and the receiver were located at the upper. Experimental determination of detection limits of impact echo test method. For details about the impact echo principle and advantages please visit the docter page. A summary of the development of the impact echo method and a comprehensive treatment of impact echo testing are available and should be read by anyone planning on using the method 2,4. Concrete slabs containing ungrouted tendon ducts were tested by applying sibie procedure. Mirador software for impact echo germann test smart. It is based on the use of impact generated compression waves that travel through the structure and are reflected by internal flaws and.
In order to improve the impactecho method and to visually identify locations of reflectors, a new procedure has been developed by applying an imaging procedure to the data, as stack imaging of spectral amplitudes based on impactecho sibie. Imaging methods of concrete structure based on impactecho test. This report presents a study and accompanying laboratory work to investigate a recentlydeveloped aircoupled impactecho ie nondestructive testing ndt method, in which microphones replace the traditional physicallycoupled ie sensors. The impact echo test method is one of the most recent of the nondestructive testing methods used on concrete for the detection of damage. Pundit ultrasonic pulse velocity and pulse echo tomography. Impact is also a leading manufacturer of test sieves within the uk, impact has been supplying to engineering, mining, chemical, pharmaceutical, agricultural and food industries for over 20 years, and are proud to have a reputation for supplying quality products and excellent service. The impactecho test instruments and software described in.
Impact echo instruments is the world leader in developing and marketing impact echo technology for evaluating concrete and masonry structures, catering to construction managers, dot engineers, and forensic test consultants. The reflected wave is then recorded, processed and displayed. Pdf effectiveness of impact echo testing in detecting flaws in. The location of the hammer impact should be as close as possible to the shaft center. Stresswave nondestructive testing of tunnels and shafts larry d.
Impact echo test for concrete nondestructive testing. The impactecho test method is one of the most recent of the nondestructive testing methods used on concrete for the detection of damage. For details about the impactecho principle and advantages please visit the docter page. To develop an optimum testing system and verify the new method, two concrete plates were tested in the laboratory, one of which was a solid concrete slab. Civil engineering animated videos, civil engineering videos s. The impact echo scanning system by olson instruments is designed for a large area test of shallow voids, debondingdelamination, cracking, or honeycomb often found between an overlay on a bridge deck or surrounding dense rebar mats. In nondestructive testing of metals, the ultrasonic pulseecho upe technique has proven to be a reliable method for locating cracks and other internal defects. Impact echo is a method for nondestructive evaluation of concrete and masonry.
Advancements in evaluation of aircoupled impactecho test. The test is also described in astm c8304 2010, standard test method for measuring the pwave speed and the thickness of concrete plates using the impact echo method. Malcolmbaldrige,secretary nationalbureauofstandards. Imaging concrete structures using aircoupled impactecho. Concrete condition assessment using impactecho method and. Impactecho is a method for nondestructive testing of concrete and masonry structures, based on. Svh for a 6 mv beam, and calculated to be about 40 times higher for an 18 mv beam.
The impactecho test signals were classified in three types of signals, fully injected ducts, partially injected ducts and empty ducts. It is based on monitoring the surface motion resulting from a shortduration mechanical impact. Mar 26, 2016 the impact echo ie method is a popular nondestructive testing ndt technique widely used for measuring the thickness of platelike structures and for detecting certain defects inside concrete elements or structures. Test results from concrete slabs containing artificial delaminations and voids are reported, where an aircoupled impactecho scan is conducted over the entire. The thickness is calculated from this measured frequency and the pwave speed obtained from procedure a. Sonic echo sonic echo sssseeee data interpretation data interpretation data interpretation instruction manual for sonic echo data interpretation. Sonic echo sonic echo sssseeee data interpretation. The impact echo method is based on the use of impact generated stress waves that propagate through the material and are reflected by both the materials external surfaces and internal flaws. Finally, the accuracy of the impact echo method for concrete pavement applications was studied. The method overcomes many of the barriers associated with flaw detection in concrete based on ultrasonic methods. For more product info and pricing, give us a call today. Impact echo test nondestructive test of concrete youtube. Analysis of the frequency spectra of all the testing showed only the frequencies associated with the thickness of. The test is also described in astm c8304 2010, standard test method for measuring the pwave speed and the thickness of concrete plates using the impactecho method.
Impactecho test this procedure measures the frequency at which the pwave generated by a shortduration, point impact is reflected between the parallel opposite surfaces of a plate. Impact echo scanning impact echo test olson instruments. The impactecho ie method is a popular nondestructive testing ndt technique widely used for measuring the thickness of. Figure 1 impact echo test method more, depending on access conditions and the desired grid. In nondestructive testing of metals, the ultrasonic pulseecho upe technique. Standard test method for low strain impact integrity testing of deep foundations link to the astm standard compliance certificate pdf, 194kb confirms that our pet system, running pet version 3. The james vucon system uses the impact echo method to evaluate concrete and masonry structures. The test results were confirmed visually at six locations, two in each class, by inserting an endoscope through the holes of the top filling tubes.
The impactecho ie method is a popular nondestructive testing ndt technique widely used for measuring the thickness of platelike structures and for detecting certain defects inside concrete elements or structures. The impact echo method is a technique for flaw detection in concrete. The thickness is calculated from this measured frequency and. In selecting an effective test method, special attention should be given to the limitations of the method for field investigation. It is based on the use of impactgenerated compression waves that travel through the structure and are reflected by internal flaws and. Concrete condition assessment using impactecho method. Compared with most methods, the method utilizes and extremely advanced technology and seems to have extensive possibilities for the user. The technique, which is referred to as the impactecho method, involves introducing transient stress waves into a test object by mechanical point impact and. Longterm bridge performance ltbp program protocols, version 1. The purpose of this paper is to provide an overview of the technique and to discuss the important parameters. Impactecho instruments is the world leader in developing and marketing impactecho technology for evaluating concrete and masonry structures, catering to construction managers, dot engineers, and forensic test consultants. The impactecho method is a technique for flaw detection in concrete. Stresswave nondestructive testing of tunnels and shafts.
Analysis of the frequency spectra of all the testing showed only the frequencies associated with the thickness of the walls. Impactecho is a method for nondestructive evaluation of concrete and masonry. Impactecho is a method for nondestructive evaluation of concrete and masonry structures, based on the use of impactgenerated stress sound waves that propagate through a structure and are reflected by internal flaws and external surfaces. Imaging methods of concrete structure based on impact. This video animation, animated video explains the concept of impactecho test for concrete. A summary of the development of the impactecho method and a comprehensive treatment of impactecho testing are available and should be read by anyone planning on using the method 2,4. Standard test method for low strain impact integrity. Geoviews impact echo testing equipment can test concrete from 1.
This report presents a study and accompanying laboratory work to investigate a recentlydeveloped aircoupled impact echo ie nondestructive testing ndt method, in which microphones replace the traditional physicallycoupled ie sensors. Concrete science conducted the impactecho testing on the suspect walls. Different ndt methods are used for different applications. Astm c83 15 standard test method for measuring the p. The test results showed a wide variation in the response spectra for the columns with exterior honeycombing. Alternatively three sensor configurations are available for use with the freedom data pc. The final report presents the results of an experimental and computational study on the recentlydeveloped aircoupled impactecho ie nondestructive testing ndt method, in which microphones replace the traditional physicallycoupled ie sensors.
In each test, the impact source and the receiver were located at the upper right and lower left corners of a grid, respectively. Delaminations in anchor block walls germann test smart. Impact echo concrete thickness concrete xray geoview. It is known that impactecho test method ha s certain limitations in respect to size and. It also introduces the software, impacte, used with impactecho test systems made by impactecho instruments, llc. Departmentofcommerce nationalbureauofstandards nationalengineeringlaboratory centerforbuildingtechnology structuresdivision gaithersburg,md20899 september1986. A solenoid is used to create a high frequency compressional wave that reflects off the bottom of the structure or from a flaw within the structure. Recent use of the pipe scanner prototype system has shown that rapid testing is possible, but that changes to the transducers may be required if testing is to be done under the wide range of surface. If a transmitter is used, the method is called pulseecho. If a transmitter is used, the method is called pulse echo. Astmc83 standard test method for measuring the pwave. Standard test method for low strain impact integrity testing of deep foundations1 this standard is issued under the. C83 04 standard test method for measuring the pwave speed and the thickness of concrete plates using the impactecho method, concrete plate, impactecho, nondestructive testing, pwave speed, thickness measurement.
Astm c83 04 standard test method for measuring the p. Standard test method for low strain impact integrity testing. Evaluation of aircoupled impactecho test method institute. The maximum measured dose rate from radiation survey on this wall was 0. Guidebook on nondestructive testing of concrete structures.
449 351 843 1026 1524 1577 1211 898 1473 180 1136 87 771 812 789 924 1068 258 800 264 748 1482 974 1550 1509 203 513 1026 413 561 1593 673 934 262 396 84 1417 1449 1308 544 1412