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This month 9 papers of the International Symposium NDT-CE '95 focus on Ultrasonic Testing in Civil Engineering. The Table of Contents of Proceedings shows 195 papers on 1346 pages in vol. 2. The next NDT-CE '97 is will be APRIL 8-11 in Liverpool UK. For readers who can't attend, Dr. Martin Krause, a specialist in UT of CE will participate in the Ask the Expert Forum of our May Workshop.
NDT Method of each
International Symposium NDT-CE Berlin 1995: A concluding Review|
This paper aims to give an overview on the about 200 oral or poster presentations of the International Symposium on Non-Destructive Testing in Civil Engineering (NDT-CE) in Berlin Sept. 1995. According to this line the following overview is somewhat a catalogue raisonne or a guide through the subjects of the symposium, the problems and the objects which have to be tested. Last but not least it shows the present situation in non-destructive testing in civil engineering all over the world which is based on former developments.
By G. Schickert DGZfP, Berlin (D)
Non-Destructive testing in Civil Engineering from Contractors Point of View
Keynote: The goal an architect must strive for is threefold: safety, serviceability, due proportion. At HOCHTIEF! Measuring technology and especially non-destructive testing has been used extensively in the construction of nuclear power plants, because of the stringent and complete documentation of quality demanded here. The Paper gives Recommendations and Wishes for Future Developments.
By B. Haselwander, C. Flohrer HOCHTIEF AG, Frankfurt a.M. (D)
Non-destructive Testing of
Ground-Anchors of Bridge Structures |
The knowledge of the trouble-free service-ability of this tension-subjected elements is of safety and economic interest for administrative authorities and owners. For this purpose testing concepts were developed. Examples for possibilities of non-destructive ultrasonic testing of ground anchoring bolts in bridge constructions are shown. The evaluation of reflectors found during the tests was made in comparison to known reflectors in reference bolts of identical geometry and similar material.
By F. Langebrake, D. Fuchs, H. Nöller DMT-Institut für Förderung und Transport, Bochum (D)
Ultrasonic crosshole testing on large concrete
The Piles of a length up to 60 m and 2.10 m in diameter were examined by ultrasonic technology to check the quality of concrete. The ultrasonic crosshole testing was used for the first time as a criterion of testing at the piles of the multi-storey building. Use of this technology has gradually increased in Germany even though it has been used in the case of high-quality foundations and diaphragm walls for a long time all over the world.
By H. Gross, W. Brameshuber Bilfinger + Berger Bauaktiengesellschaft, Mannheim (D)
Applicability of ultrasonic frequency spectrum analysis to material tesing of gypsum, cement and
The paper presented here reports the improvements on Ultrasound-Pulse-Echo Testing gained with a special testing-system. It will describe the testing technique in use and shows a couple of measurements done using different testing parameters. The successes realized so far prove the facilities of the Pulse-Echo-Method on concrete. To get the full advantage more research and practical testing are needed.
By M. Jonas, J. Neisecke, Univerität Dortmund
Towards SAFT-Imaging in Ultrasonic Inspection of Concrete |
The contribution shows the use of ultrasonic SAFT-reconstruction and demonstrates the applicability to inspection of concrete. To explain why SAFT is especially suited for that purpose some of the propagation properties of ultrasonic waves in concrete are reviewed, and comparison is made between SAFT and conventional A- and B-scan techniques.
By M. Schickert MFPA at HAB, Weimar
|Detection of Thickness, Voids, Honeycombs and Tendons|
The development of non-destructive testing methods utilizing ultrasound pulse echo technique is the intention of a research project started in September 1992 at Technical University of Darmstadt in co-operation with Instrumentation Innovation Ltd. The targets of interest are the measurement of thickness of structures which are only accessible from one side, the detection of cracks, voids and honeycombing. A transducer array allows the performing of different averaging strategies.
By R. Jansohn, O. Kroggel, M.Ratmann TH Darmstadt
|Comparison of DIN/ISO 8047 (Entwurf) to Several Standards on Determination of Ultrasonic Pulse Velocity in Concrete|
Nondestructive testing methods based on longitudinal pulse velocity have become popular because of their simplicity and cost effectiveness. Eight standards for the performance of this test are analyzed in this paper. This work was partially sponsored by the U.S. - Slovak Science and Technology Program.
By S. Popovics, K. Komlos, J. Popovics
Combination of a Covermeter with a Radar System - an Improvement of Radar Application in Civil Engineering|
The paper describes a method of linking a distance-controlled covermeter with a radar system to an efficient non destructive testing method for exact location of prestressed elements under multiple rebar layers. The CM-Radar sensor can be used to detect whether a rebar is made of base or precious metals. This application can be used for the investigation of the slab constructions built in the last 40 years in the former GDR.
By M. Pöpel, C. Flohrer, Hochtief AG, Frankfurt a.M. (D)
Search Result: Ultrasonic and Concrete
10 Abstracts from FIZ-Technik Database Frankfurt. FIZ Technik is on the World Wide Web.
Virtual Library of "UT in Civil Engineering"|
We have updated The Virtual Library in the area of the theme of this month's issue of UTonline. A new Focus on Virtual Patents of "UT in Civil Engineering" is provided and you can access the abstracts of many Patents.
Comparison of Pulse-Echo-Methods for Testing Concrete |
This article was part of the November '96 UTonline issue.
| Search Results on NDTnet for "concrete" and "civil". |
Ultrasonic Applications Highlights - Part 3
For this edition of "the echo" Krautkramer has selected some interesting test reports. Echo 35 - edited by U. Huhn, W.-D. Kleinert, R. Krause, H. Neuhaus
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