Journal articles: 'Impact-echo'

1

Schubert, Frank, and Bernd Köhler. "Ten Lectures on Impact-Echo." Journal of Nondestructive Evaluation 27, no. 1-3 (July 1, 2008): 5–21. http://dx.doi.org/10.1007/s10921-008-0036-2.

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2

Sansalone, M. J., and W. B. Streett. "Impact-Echo Condition Assessment of Structures." Structural Engineering International 6, no. 4 (November 1996): 282–84. http://dx.doi.org/10.2749/101686696780496238.

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3

Knodel, PC, Y. Lin, M. Sansalone, and NJ Carino. "Impact-Echo Response of Concrete Shafts." Geotechnical Testing Journal 14, no. 2 (1991): 121. http://dx.doi.org/10.1520/gtj10554j.

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4

Xinwei Wang, Xinwei Wang, Yan Zhou Yan Zhou, and Yuliang Liu Yuliang Liu. "Impact of echo broadening ef fect on active range-gated imaging." Chinese Optics Letters 10, no. 10 (2012): 101101–3. http://dx.doi.org/10.3788/col201210.101101.

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5

Cho, Mi Ra, Ki Bong Kim, Sung Ho Joh, and Tae Ho Kang. "Improvement of the Impact-Echo Method for the Higher Reliability in the Structural Integrity Assessment." Key Engineering Materials 321-323 (October 2006): 336–39. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.336.

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The impact-echo method, which is to evaluate the integrity of concrete and masonry structures nondestructively, is an excellent method in practical applications, and provides a high quality of structural integrity assessment. However, in the case of multi-layered systems in which each layer has different stiffness, the impact-echo method may lack reliability in thickness evaluation, which demands improvement of the impact-echo method. This study was first dedicated to the understanding of stress-wave propagation in the impact-echo test, and secondly, the reliability of the impact-echo method was investigated through the numerical simulation of the impact-echo test. The investigation included the research on influencing factors such as stiffness contrast between layers and receiver location. Finally, the research in this paper led to the development of the phase-difference response (PDR) method, based on the frequency response between two receivers deployed in a line with an impact source.

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Gucunski, Nenad, Greg Slabaugh, Zhe Wang, Tong Fang, and Ali Maher. "Impact Echo Data from Bridge Deck Testing." Transportation Research Record: Journal of the Transportation Research Board 2050, no. 1 (January 2008): 111–21. http://dx.doi.org/10.3141/2050-11.

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Maji, A. K., S. Paul, and M. L. Wang. "Improved Impact-Echo Technique by Signal Processing." Research in Nondestructive Evaluation 2, no. 1 (January 1990): 45–56. http://dx.doi.org/10.1080/09349849009409485.

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8

Yao, Fei, Guangyu Chen, and Jianhong Su. "Experimental Research and Numerical Simulation on Grouting Quality of Shield Tunnel Based on Impact Echo Method." Shock and Vibration 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/1025276.

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To identify shield grouting quality based on impact echo method, an impact echo test of segment-grouting (SG) test piece was carried out to explore effect of acoustic impedance of grouting layers and grouting defects on impact echo law. A finite element numerical simulation on the impact echo process was implemented. Test results and simulation results were compared. Results demonstrated that, under some working conditions, finite element simulation results and test results both agree with theoretical values. The acoustic impedance ratio of SG material influenced the echo characteristics significantly. But thickness frequency could not be detected under some working conditions because the reflected energy is weak. Frequency feature under grouting defects was more complicated than that under no grouting defects.

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9

Xiao, Yun Feng, Da Hai Zhang, and Li Liu. "Internal Imperfection Detection of Concrete Composite Component Using Ultrasonic Method and Impact-Echo Method." Advanced Materials Research 639-640 (January 2013): 1046–50. http://dx.doi.org/10.4028/www.scientific.net/amr.639-640.1046.

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The ultrasonic method and the impact-echo method are two kinds of nondestructive test method (NDT), which are widely used, not only for concrete component, but for masonry structures. However, it is hard to detect the flaw in the concrete composite component if only with one kind of detection method. In this study, the principle of ultrasonic method and impact-echo method are outlined. And an attempt of a new method is taken, that Ultrasonic method together with Impact-echo method is used in detecting the deflection in Concrete Composite Component. It is proved that the result of this new method is more accurate and stable than that of only using ultrasonic method or impact-echo method. Introduction Introduction

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Liu, Jing, Jun Xie, Xiao Yu He, Yu Shan He, and Jia Hui Zhong. "Detecting the Defects in Concrete Components with Impact-Echo Method." Applied Mechanics and Materials 577 (July 2014): 1114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.577.1114.

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With the large-scale application of the prestressed concrete structure, the quality of the concrete component defects and pipeline grouting has increasingly become the focus of attention. The impact-echo scanner uses the nature of wave, which pass though different media at different velocities, to distinguish internal defects of concrete, pipe filling density and so on. In this paper, using the impact-echo method to detect the concrete block with prefabricated defects of shape, location, and size explores the effect of defect properties, parameter settings and detection environment to impact-echo preliminarily and also explores the relationship of pipeline filling status and impact-echo image. Based on this study, the article raised the problem met during this non-destructive testing methods applied to engineering, and accumulated a certain amount of available engineering data. The experiment results show that using the impact-echo method to identify the defects of concrete components and to test the quality of pipeline grouting is a more convenient and effective non-destructive testing method. Especially, with the radar method in the pipeline grouting quality inspection which complement each other to make up for the shortcomings the lightning wave in case of the metal medium total reflection phenomenon, cannot detect metal pipe grouting plumpness.

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11

Zhou, Chang Sheng, Ping Wang, Zhi Peng Hu, and Hao Zhu. "Numerical Simulation of Impact-Echo Method Identify the Depth of Honeycomb Damage in Unballasted Track." Applied Mechanics and Materials 584-586 (July 2014): 2060–67. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.2060.

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Through the honeycomb damage that is appear in unballasted track will affect the safe operation of high-speed train, accurate detection of honeycomb damage is very important. Impact-echo method is a non-destructive testing method. Based on the principle of impact echo, author using the finite element software ANSYS LS-DYNA3D to simulate the impact-echo, testing and verifying the feasibility and accuracy of impact-echo method in discerning unballasted track damage. By analyzing the calculated result of honeycomb damage in slab track and double-block ballastless track, it is shows that: according to back calculate the depth of damage base on the peak value in acceleration spectrum graph, the honeycomb damage in different depth can be accurate located.

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12

Alhawat, Musab, Amir Khan, and Ashraf Ashour. "Evaluation of Steel Corrosion in Concrete Structures Using Impact-Echo Method." Advanced Materials Research 1158 (April 2020): 147–64. http://dx.doi.org/10.4028/www.scientific.net/amr.1158.147.

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The impact-echo method is commonly used for detection of flaws in concrete elements based on the shift in the thickness frequency of a plate-like member. However, there is a need to develop this efficient technique for other applications. This paper investigates the feasibility of using the impact echo-method for identifying corrosion of steel reinforcement in concrete structures. For this purpose, 180 reinforced concrete cubes were cast and tested. The main parameters studied were the amount of recycled aggregate (i.e. 0%, 25%, 50% and 100%), nanosilica (1.5% and 3%) and the steel bar diameter (12 and 20mm). Different levels of corrosion were electrochemically induced by applying impressed voltage technique for 2, 5, 10 and 15 days. The impact-echo results were correlated against the actual corrosion levels obtained by the mass loss method. The experimental results showed that the response of impact echo in terms of frequency peaks is found to be sensitive to the high and moderate levels of corrosion. However, no clear trend was observed at the initial stage of corrosion. It is demonstrated that the impact-echo testing can be effectively used to qualitatively detect the damage caused by corrosion phenomenon in reinforced concrete structures.

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13

Carrico, Catherine, Tonja Woods, Robin A. Barry, Kevin Franke, and Christine McKibbin. "PROVIDER AND SYSTEM IMPACTS OF THE UW ECHO IN RURAL AND FRONTIER CARE TRANSITIONS." Innovation in Aging 3, Supplement_1 (November 2019): S294—S295. http://dx.doi.org/10.1093/geroni/igz038.1083.

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Abstract Background: The Project ECHO model utilizes a hub and spoke approach through which a team of experts co-mentors local providers in the management of complex cases while disseminating information about best practices and evidence-based care. Project ECHO is a promising model for improving patient care through transformation of the care delivery system. The UW ECHO in Rural and Frontier Care Transitions created an online community of practice comprised of local care coalitions dedicated to improving care transitions in Wyoming and Montana. This ECHO network provided a unique opportunity to support system- and provider-level implementation of best practices in care transitions. Methods: Semi-structured interviews were conducted with thirty ECHO attendees following participation in an ECHO session as either a participant or case presenter. Thematic analysis was used to analyze interview data. Results: Two overarching themes emerged 1) impact of the ECHO on the provider or healthcare team and 2) impact on the system. Participants indicated that the impact on the provider/healthcare team included an increased sense of community, increased awareness of community resources, increased knowledge of care transition strategies, and increased confidence in implementing best practices. Additionally, providers indicated increased utilization of community resources. Systemic impacts included increased involvement of interprofessional team members in patient care and utilization of ECHO recommendations to present systemic interventions and changes to colleagues, administration, and leadership. Conclusions: This ECHO network had a particularly strong impact on the provider and healthcare team as participants increased their knowledge, confidence, and use of best practices in care transitions.

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LEE, Sanghun, Takao ENDO, Toshiro KAMADA, and Sangjin KIM. "Application of Impact-Echo Method to Heterogeneous Materials." International Journal of the Society of Materials Engineering for Resources 20, no. 2 (2014): 170–74. http://dx.doi.org/10.5188/ijsmer.20.170.

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15

Gibson, Alexander, and John S. Popovics. "Lamb Wave Basis for Impact-Echo Method Analysis." Journal of Engineering Mechanics 131, no. 4 (April 2005): 438–43. http://dx.doi.org/10.1061/(asce)0733-9399(2005)131:4(438).

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16

Zhu, Jinying, and John S. Popovics. "Imaging Concrete Structures Using Air-Coupled Impact-Echo." Journal of Engineering Mechanics 133, no. 6 (June 2007): 628–40. http://dx.doi.org/10.1061/(asce)0733-9399(2007)133:6(628).

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17

Piotrowski, T., A. Garbacz, A. van der Wielen, L. Courard, and F. Nguyen. "Zur Beziehung zwischen Verbund Qualität und Impact-Echo Frequenzspektrum / On the Relation between Bond Quality and Impact-echo Frequency Spectrum." Restoration of Buildings and Monuments 16, no. 4-5 (October 1, 2010): 303–14. http://dx.doi.org/10.1515/rbm-2010-6388.

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18

Watanabe, Takeshi, Hirotoshi Fujigaki, Tomoki Shiotani, Chikanori Hashimoto, and Masayasu Ohtsu. "OS3-5-4 Effect of grout material on impact-echo in repaired concrete." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2007.6 (2007): _OS3–5–4–1—_OS3–5–4–4. http://dx.doi.org/10.1299/jsmeatem.2007.6._os3-5-4-1.

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19

Kong, Cun Zhi, Xiang Feng Xu, Jia Long Sun, Guang Zhi Qi, and Yuan Cao. "Application of Impact-Echo Method in Grouting Inspection in Ducts inside Prefabricated Box Girder." Applied Mechanics and Materials 505-506 (January 2014): 24–27. http://dx.doi.org/10.4028/www.scientific.net/amm.505-506.24.

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Based on basic principle of detection using impact-echo method, in combination with urgent demand of grouting quality inspection in ducts inside post tensioning type prefabricated box girder in bridge engineering, impact-echo method has been used for non-destructive detection of grouting compactness in pre-stressed ducts inside prefabricated box girder. Verification by beating away measuring points shows that the impact-echo method can accurately locate metal corrugated pipes and qualitatively judge grouting compactness inside prefabricated box girder ducts, to allow effective inspection of grouting quality in strands of pre-stressed ducts.

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20

Орешкович, Матіа, Іван Цвіткович, Предраг Брлек, Євгеній Клименко, Луція Кучіна, and Олена Крантовська. "Research of the bridge structure by impact-echo method." Сучасні технології та методи розрахунків у будівництві, no. 15 (June 25, 2021): 54–64. http://dx.doi.org/10.36910/6775-2410-6208-2021-5(15)-08.

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This article reflects the results of studies of the operated bridge on the river Mozdernyak in the municipality of Kneginek (Croatia), which was subject to expert analysis of the needs of reconstruction. In the process of field research of the structures of the considered bridge, the Impact-Echo method was used and at the same time the peculiarities of the method of this method were investigated. In particular, on the basis of the Impact-Echo method, the construction of the old part of the studied bridge was checked, as well as the connection of this old part with the new part of the bridge was checked. Also, studies on the example of the construction of this bridge found that the acoustic properties of the wall components (brick, block and mortar) are quite similar, that in most cases masonry building elements respond to Echo-Impact as a solid block and this should be taken into account. This method allows you to detect cavities in several walls and assess their scale and impact on the strength of structures. The use of research equipment provided by the Impact-Echo method allowed to investigate the deposition of concrete in the lower and upper reinforcing zones of the bridge, as well as to determine the existing boundary between the layer of concrete and asphalt. Thus, the results of the research presented in the article allow to improve the methodology of research of bridge structures by the Impact-Echo method. In addition, expert opinions were made on the condition and prospects of operation of the bridge considered in this article - the bridge structure is in a satisfactory condition, which allows its operation. However, after some time it is recommended to repeat the research of the bridge using the method of the Beat-Echo method, with the continuation of the research areas to a new section of the bridge.

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21

Kim, Jeong-Su, Chang Joon Lee, and Sung Woo Shin. "Non-contact Impact-Echo Based Detection of Damages in Concrete Slabs Using Low Cost Air Pressure Sensors." Journal of the Korea institute for structural maintenance and inspection 15, no. 3 (May 30, 2011): 171–77. http://dx.doi.org/10.11112/jksmi.2011.15.3.171.

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22

Matysik, Michal, Iveta Plskova, and Zdenek Chobola. "Assessment of the impact-echo method for monitoring the long-standing frost resistance of ceramic tiles." Materiali in tehnologije 49, no. 4 (July 25, 2015): 639–43. http://dx.doi.org/10.17222/mit.2014.155.

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23

Lin, Yi Ching, Chun Kuei Yang, and Chia Chi Cheng. "Calibration of an Impact Device and Its Application to the Normalized Spectral Analysis of Impact-Echo Tests." Key Engineering Materials 321-323 (October 2006): 381–85. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.381.

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The objective of this paper is to introduce an impact device made by embedding a piezoelectric sensor into a steel sphere and to develop a calibration method for measuring the impact force. The force-time function of impact can be used to normalize the spectrum obtained from an impact-echo test. Furthermore, an approach was proposed to make the normalized spectrum dimensionless. A new technique based on the dimensionless normalized spectrum is developed to quantitatively evaluate the difference in acoustic impedance at the interface between two dissimilar materials. The impact-echo test results show that the dimensionless normalized spectrum is capable of identifying the degree of the difference in acoustic impedance at the interface between two dissimilar materials.

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24

Lho, Byeong-Cheol. "Accuracy Enhancement of Reflection Signals in Impact Echo Test." Journal of the Korea Concrete Institute 15, no. 6 (December 1, 2003): 924–29. http://dx.doi.org/10.4334/jkci.2003.15.6.924.

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25

Groschup, Robin, and Christian Grosse. "MEMS Microphone Array Sensor for Air-Coupled Impact-Echo." Sensors 15, no. 7 (June 25, 2015): 14932–45. http://dx.doi.org/10.3390/s150714932.

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26

Hlaváč, Z., O. Anton, and A. Garbacz. "Detection of Steel Bars in Concrete by Impact-Echo." Transactions on Transport Sciences 2, no. 3 (September 1, 2009): 122–27. http://dx.doi.org/10.5507/tots.2009.017.

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27

Medina, R., and M. Garrido. "Improving impact-echo method by using cross-spectral density." Journal of Sound and Vibration 304, no. 3-5 (July 2007): 769–78. http://dx.doi.org/10.1016/j.jsv.2007.03.019.

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28

Lu, Xiaobin, Fengling Ma, Allyn Luke, and Ronglu Wang. "Assessing frost resistance of concrete by impact-echo method." Magazine of Concrete Research 67, no. 6 (March 2015): 317–24. http://dx.doi.org/10.1680/macr.14.00051.

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29

Algernon, Daniel, and Herbert Wiggenhauser. "Impact Echo Data Analysis Based on Hilbert-Huang Transform." Transportation Research Record: Journal of the Transportation Research Board 2028, no. 1 (January 2007): 146–53. http://dx.doi.org/10.3141/2028-16.

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30

Dankel, Scott J., Takashi Abe, Robert W. Spitz, Ricardo Viana, Zachary W. Bell, Vickie Wong, Raksha N. Chatakondi, and Jeremy P. Loenneke. "Impact of Acute Fluid Retention on Ultrasound Echo Intensity." Journal of Clinical Densitometry 23, no. 1 (January 2020): 149–50. http://dx.doi.org/10.1016/j.jocd.2019.02.008.

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31

Kee, Seong-Hoon, and Nenad Gucunski. "Interpretation of Flexural Vibration Modes from Impact-Echo Testing." Journal of Infrastructure Systems 22, no. 3 (September 2016): 04016009. http://dx.doi.org/10.1061/(asce)is.1943-555x.0000291.

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32

Aggelis, D. G., T. Shiotani, and K. Kasai. "Evaluation of grouting in tunnel lining using impact-echo." Tunnelling and Underground Space Technology 23, no. 6 (November 2008): 629–37. http://dx.doi.org/10.1016/j.tust.2007.12.001.

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33

Popovics, John S. "Effects of Poisson's Ratio on Impact-Echo Test Analysis." Journal of Engineering Mechanics 123, no. 8 (August 1997): 843–51. http://dx.doi.org/10.1061/(asce)0733-9399(1997)123:8(843).

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34

Yusuf, Nadia, Nisreen Al-Banawi, and Hajjah Abdel Rahman Al-Imam. "The Social Media As Echo Chamber: The Digital Impact." Journal of Business & Economics Research (JBER) 12, no. 1 (December 31, 2013): 1. http://dx.doi.org/10.19030/jber.v12i1.8369.

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The media serve as the channels used to deliver information or research data for any purpose. With media and technology combined, if today a person is sitting in one corner of the world, he or she can send knowledge and words to an unimaginable number of people without fear of being interrupted or argued with. This paper explores the impact of media technology in our lives. The advent of the social media is playing a role in all facets of our lives. Its overriding existence with free search engines has changed the trends in education, economics, politics, and our day-to-day routine. Here we highlight how the quest of technology in the form of social media has been an important aspect of getting this world expressed in terms of bytes. The social media include web-based technology that has changed communication into a more interactive dialogue. The social media have completely transformed the way we connect or reconnect with old friends and acquaintances, entertain ourselves, pursue our hobbies, shop, relax, and look for jobs. The social media are the primary communication medium today for a new generation of digitally aware consumers.

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35

Schoefs, Franck, and Odile Abraham. "Probabilistic Evaluation to Improve Design of Impact–Echo Sources." Transportation Research Record: Journal of the Transportation Research Board 2313, no. 1 (January 2012): 109–15. http://dx.doi.org/10.3141/2313-12.

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36

Epasto, Gabriella, E. Proverbio, and V. Venturi. "Evaluation of fire-damaged concrete using impact-echo method." Materials and Structures 43, no. 1-2 (February 18, 2009): 235–45. http://dx.doi.org/10.1617/s11527-009-9484-0.

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37

Zhou, H., T. Izumi, and H. Uchikado. "1P1-F7 Wall Tiles Test Using Impact-echo Technique." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2001 (2001): 25. http://dx.doi.org/10.1299/jsmermd.2001.25_6.

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Buechler, Dennis E., and Steven J. Goodman. "Echo Size and Asymmetry: Impact on NEXRAD Storm Identification." Journal of Applied Meteorology 29, no. 9 (September 1990): 962–69. http://dx.doi.org/10.1175/1520-0450(1990)029<0962:esaaio>2.0.co;2.

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Ni, Sheng-Huoo, and Ji-Lung Li. "HHT-Based CEEMD to Improve an Impact Echo Test." Journal of Testing and Evaluation 47, no. 4 (August 9, 2018): 20170263. http://dx.doi.org/10.1520/jte20170263.

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40

Lin, Yiching, Chiafeng Chang, Shih-Fang Kuo, and Han-Chieh Liou. "A simple device for detecting impact time in impact-echo testing of concrete." NDT & E International 37, no. 1 (January 2004): 1–8. http://dx.doi.org/10.1016/j.ndteint.2003.08.004.

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Mori, Kazuya, Kenichiro Nishi, and Tatsuya Iwamoto. "OS11-1-5 Imaging of Time- Domain Displacement Signals Based on the Impact-Echo Method." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011.10 (2011): _OS11–1–5—. http://dx.doi.org/10.1299/jsmeatem.2011.10._os11-1-5-.

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Plšková, Iveta, Michal Matysík, and Zdeněk Chobola. "Monitoring of Thermal Damage Evolution in Concrete Parts by Acoustic NDT Methods." Key Engineering Materials 808 (June 2019): 159–64. http://dx.doi.org/10.4028/www.scientific.net/kem.808.159.

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The paper presents the results of the experimental work which was focused on the use of the Impact-echo method for testing of concrete specimens damaged by high-temperature. The test specimens were heated to 600 and 800 °C for sixty, one hundred twenty and three hundred minutes. After heating, the samples were continuously cooled to room temperature and tested by Impact-echo method.

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Plšková, Iveta, Michal Matysík, Libor Topolář, and Petr Hrubý. "NDT Monitoring of Alkali-Activated Material Carbonation." Key Engineering Materials 868 (October 2020): 45–50. http://dx.doi.org/10.4028/www.scientific.net/kem.868.45.

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Production of Portland cement is relatively environmentally demanding (high CO2 emissions, extraction of raw materials for its production). Alkali-activated materials are an alternative to conventional Portland cement in the production of concrete. For alkali-activated binder concretes, their ability to withstand corrosive environments and their ability to protect steel reinforcement must be assessed. It is also necessary to know the suitability of non-destructive methods for monitoring the degradation process of these concretes. The paper deals with the carbonation monitoring of concrete with alkali-activated binder (slag) by the impact-echo method. Slag activated by sodium hydroxide (NaOH) was used as a binder. The specimens were tested by the non-destructive method (Impact-echo, ultrasound velocity). We focused on the shift of the dominant frequency obtained by the Impact-echo method.

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Yao, Fei, and Abula Abulikemu. "Effect of impact source on detection quality in impact echo testing of sleeve grouting." Materials Testing 62, no. 9 (September 7, 2020): 927–35. http://dx.doi.org/10.3139/120.111566.

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Matysík, Michal, Iveta Plšková, and Zdeněk Chobola. "Estimation of Impact-Echo Method for the Assessment of Long-Term Frost Resistance of Ceramic Tiles." Advanced Materials Research 1000 (August 2014): 285–88. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.285.

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The aim of this paper is to evaluate the possibility of using the Impact-echo method for assessment of extremely long period of frost resistance of ceramic tiles. Sets of ceramic tiles of the Ia class to EN 14 411 B standard made by manufacture RACOs have been analyzed. The ceramic tiles under investigation have been subjected to 500 freeze-thaw-cycle based degradation in compliance with the relevant EN ISO 10545-12 standard. To verify the correctness of the Impact-echo method results, additional physical properties of the ceramic tiles under test have been measured. To analyze the specimen surface condition, we also used Olympus LEXT 3100 confocal scanning microscope. It has been proved that the acoustic method Impact-echo is a sensitive indicator of the structure condition and can be applied to the ceramic cladding element frost resistance and service life prediction assessment.

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46

Kim, Dong Soo, Nam Ryong Kim, and Won Seok Seo. "Time-Frequency Analysis for Impact Echo-SASW (IE-SASW) Method." Key Engineering Materials 270-273 (August 2004): 1529–34. http://dx.doi.org/10.4028/www.scientific.net/kem.270-273.1529.

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47

Igual, Jorge, Addisson Salazar, Gonzalo Safont, and Luis Vergara. "Semi-Supervised Bayesian Classification of Materials with Impact-Echo Signals." Sensors 15, no. 5 (May 19, 2015): 11528–50. http://dx.doi.org/10.3390/s150511528.

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48

Šamárková, Kristýna, Zdeněk Chobola, Daniela Štefková, and Ivo Kusák. "Impact-Echo Methods to Assessment Corrosion of Reinforced Concrete Structures." Applied Mechanics and Materials 627 (September 2014): 268–71. http://dx.doi.org/10.4028/www.scientific.net/amm.627.268.

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The aim of this paper is to evaluate the corrosion of reinforced concrete structure. To assess the state of corrosion we used frequency signal analysis, where we observed the changes in dominant frequencies and growth of damping factor λ. Tension pulse was produced in axis of the rod at one end and detected in axis at opposite end of rod. Diameter of steel rod was 8 mm. The article presents the results of measurements obtained during 24 months controlled degradation in aqueous NaCl solution.

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Çam, Ertuğrul, Sadettin Orhan, and Murat Lüy. "An analysis of cracked beam structure using impact echo method." NDT & E International 38, no. 5 (July 2005): 368–73. http://dx.doi.org/10.1016/j.ndteint.2004.10.009.

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Hsiao, Chiamen, Chia-Chi Cheng, Tzunghao Liou, and Yuanting Juang. "Detecting flaws in concrete blocks using the impact-echo method." NDT & E International 41, no. 2 (March 2008): 98–107. http://dx.doi.org/10.1016/j.ndteint.2007.08.008.

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Journal articles on the topic 'Impact-echo'

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