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- since 1996 -

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Technical Discussions
James Gauthier
NDT Inspector, Operations Manager
GE Inspection Services, USA, Joined Nov 2007, 25

James Gauthier

NDT Inspector, Operations Manager
GE Inspection Services,
USA,
Joined Nov 2007
25
22:21 Jan-05-2010
Concrete Inspection (8ft thick/access one side only)

I am familiar with GPR systems and technology as we have a couple of these units. Good for approx. 3 ft as a rule of thumb (dependent on concrete type and condition). My question is "does anyone know of a way to inspect an 8ft thick concrete specimen that you only have access to one side?"


Impact Echo systems come to mind but I am unfamiliar with the depth capabilities of that particular system. (I think it is similar to the GPR)

Any thoughts?

Jamie

    
 
 
Martin Schickert
R & D,
Institute for Materials Research and Testing, Germany, Joined Jan 2000, 18

Martin Schickert

R & D,
Institute for Materials Research and Testing,
Germany,
Joined Jan 2000
18
10:40 Jan-06-2010
Re: Concrete Inspection (8ft thick/access one side only)
In Reply to James Gauthier at 22:21 Jan-05-2010 (Opening).

The largest thicknesses measured non-destructively I have heard of were in the range of 1.5 to 2 m. We haven't done such measurements ourselves.

Success would depend strongly on the concrete and its surface conditions on both sides. Possible techniques would be ultrasound and impact-echo, using the best equipment and all filtering and averaging possibilities available. To be able to discriminate between back wall echoes and other reflections, I would use line scanning (B-scan) or planar scanning, possibly followed by SAFT reconstruction in the ultrasonic case.

I would be surprised if thickness measurements larger 2.5 m in conrete could be done. If somebody has achieved this, he might drop a note.

Martin Schickert

    
 
 
Wieslaw Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 247

Wieslaw Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
247
23:50 Jan-07-2010
Re: Concrete Inspection (8ft thick/access one side only)
In Reply to Martin Schickert at 10:40 Jan-06-2010 .

Based on our experience I would suggest to use bursts with high amplitude and lock-in amplifier. And naturally also some method, that uses synthetic aperture - as already suggested.

    
 
 

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