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- since 1996 -

Hillger NDT GmbH
was founded in 1984 and develops special ultrasonic imaging systems for high-tech materials.
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Technical Discussions
Doug Irish
Doug Irish
08:33 Mar-12-2001
Ultrasonic testing of concrete

I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks


 
 Reply 
 
Jim Sabol
Jim Sabol
08:28 Mar-13-2001
Re: Ultrasonic testing of concrete
: I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks
. The USN 60 is not designed for this application. The frequency bandwidth is not low enough to ensure penetration of the concrete. More importantly, there is a basic limitation caused by the principles of ultrasonics. The interface between the bottom of the concrete and the underlayment will always appear as an air gap whether the underlayment is intact or missing because of erosion. We suggest ground penetrating radar as a better solution.



 
 Reply 
 
John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 280

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
280
01:43 Mar-23-2001
Re: Ultrasonic testing of concrete
UT is not the best solution for this. Try looking at Impact Echo device which is tailor made for this application. Try searching for Impact Echo or go to www.pacuk.co.uk


 
 Reply 
 
Michael Berke
Michael Berke
01:51 Mar-28-2001
Re: Ultrasonic testing of concrete
: I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks
.I suggest to try with KRAUTKRAMER USM 23LF, a high power (1200 Volts), low frequency (50 - 500 kHz)Ultrasonic Flaw Detector, specially designed for high attenuative or coarse grain material. M. Berke, Krautkramer - Germany



 
 Reply 
 
Dan Johnson
Dan Johnson
05:46 Mar-28-2001
Re: Ultrasonic testing of concrete
: : I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks

I suggest trying IMPACT ECHO TESTING, which works in the 1-60 kHz range, uses spherical impactors, and has been used in previous applications to determine the locations of such voids. This method corresponds to ASTM Standard C-1383-98 for measuring plate thickness. Dan E. Johnson, Physical Acoustics Corp., Princeton, NJ


 
 Reply 
 
oak
oak
02:40 Aug-29-2002
Re: Ultrasonic testing of concrete
: I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks
.i want testing by ultrasonics of concreat


 
 Reply 
 
oak
oak
02:45 Aug-29-2002
Re: Ultrasonic testing of concrete
: : : I am trying to determine if the Krautkramer USN 60 will test for voids, caused by erosion, in the underlayment of a large concrete floor.Thanks
.
: I suggest trying IMPACT ECHO TESTING, which works in the 1-60 kHz range, uses spherical impactors, and has been used in previous applications to determine the locations of such voids. This method corresponds to ASTM Standard C-1383-98 for measuring plate thickness. Dan E. Johnson, Physical Acoustics Corp., Princeton, NJ
.testing of concreat



 
 Reply 
 
Melissa Rubio
Melissa Rubio
08:23 Sep-09-2002
Re: Ultrasonic testing of concrete
I would like to know if anyne has used Matlab to form artificial neural networks to test flaws in concrete non destructively.
please if anyone can help please do


 
 Reply 
 
Naveen Nair
Engineering
Indian Institute of Technology Madras, India, Joined Sep 2002, 1

Naveen Nair

Engineering
Indian Institute of Technology Madras,
India,
Joined Sep 2002
1
09:12 Sep-09-2002
Re: Ultrasonic testing of concrete
: I would like to know if anyne has used Matlab to form artificial neural networks to test flaws in concrete non destructively.
: please if anyone can help please do
.

Yes it can be done. I have used MATLAB based and self developed code to do NDE of certain composites. I have not specifically worked on concrete, but I am assuming that composites is a good enough generalisation.
please do let me know if i can be of any help
Nair




 
 Reply 
 
Apostolos Tsimogiannis
Engineering, and R&D and NDT Inspector
ENVIROCOUSTICS SA, Greece, Joined Jan 2000, 2

Apostolos Tsimogiannis

Engineering, and R&D and NDT Inspector
ENVIROCOUSTICS SA,
Greece,
Joined Jan 2000
2
00:13 Sep-18-2002
Re: Ultrasonic testing of concrete
: : I would like to know if anyne has used Matlab to form artificial neural networks to test flaws in concrete non destructively.
: : please if anyone can help please do
: .
.

We have done research work for both crack-like flaw detection, sizing and properties characterization, both in building (affected from earthquakes etc) and on laboratory specimens (during hardening and compression tests). The techniques we used were Acoustic Emission, Acousto-Ultrasonics and Ultrasonic velocity.
For signal discrimination we used Noesis a software for data analysis with Pattern Recognition and Neural Networks.
You can read about this work in published papers.
for example :

WCNDT 2000 ROME : Damage Level Evaluation and Characterization by Acoustic Emission and Acousto-Ultrasonics in Concrete Under Compressive Loads ( http://www.ndt.net/article/wcndt00/papers/idn449/idn449.htm)

ECNDT 2002 BARCELONA : DETERMINATION OF CONCRETE STRENGTH AND WATER TO CEMENT RATIO BY USING PATTERN RECOGNITION TECHNIQUES ON ACOUSTO-ULTRASONIC SIGNALS

See also the links.

best regards

Apostolos Tsimogiannis



 
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