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we are specialised in the design, development and manufacture of Phased Array and Time-of-Flight Diffraction (ToFD) ultrasonic inspection systems.
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Technical Discussions
Weihua Mao
Weihua Mao
02:37 Mar-10-2002
Help Wanted: NDT for steel corrosion inside Concrete

Hello, Everyone!

Is there a NDT technique that can detect the steel corrosion under a concrete layer?
There is a steel plate underneath a concrete layer.
The thickness of the concrete is uniform (around 1 inch).
The thickness of the steel plate is about half an inch.
The potentail problem may be corrosion pots on the steel plate or even through holes.
It is only available to scan from the surface of the concrete.

Any suggestion is welcome.

Thanks in advance.

Weihua Mao



 
 Reply 
 
miveb
miveb
09:30 Mar-11-2002
Re: Help Wanted: NDT for steel corrosion inside Concrete
: Hello, Everyone!
.
: Is there a NDT technique that can detect the steel corrosion under a concrete layer?
: There is a steel plate underneath a concrete layer.
: The thickness of the concrete is uniform (around 1 inch).
: The thickness of the steel plate is about half an inch.
: The potentail problem may be corrosion pots on the steel plate or even through holes.
: It is only available to scan from the surface of the concrete.
.
: Any suggestion is welcome.
.
: Thanks in advance.
.
: Weihua Mao
.
hello:
You can try to use ultrasonic testing it's thickness if ultrasoinc can penetrate through them. Or you can phone us to discuss if you live in china too.
tel:010-62182490
addr:Central Iron & Steel Research Institute NDT laboratory.
linkman:Jianwei Zhang




 
 Reply 
 
Cameron Waters
Cameron Waters
00:23 Mar-12-2002
Re: Help Wanted: NDT for steel corrosion inside Concrete
Weihua,

pndt supply a pulsed eddy current system known as INCOTEST that would measure through up to approx 200mm of concrete to measure the carbon steel plate below.
Please contact me on the email above if you require any further assistance.

Regards,

Cameron Waters


: : Hello, Everyone!
: .
: : Is there a NDT technique that can detect the steel corrosion under a concrete layer?
: : There is a steel plate underneath a concrete layer.
: : The thickness of the concrete is uniform (around 1 inch).
: : The thickness of the steel plate is about half an inch.
: : The potentail problem may be corrosion pots on the steel plate or even through holes.
: : It is only available to scan from the surface of the concrete.
: .
: : Any suggestion is welcome.
: .
: : Thanks in advance.
: .
: : Weihua Mao
:


 
 Reply 
 
Shigenori YUYAMA
Director
Nippon Physical Acoustics Ltd., Japan, Joined Mar 2002, 2

Shigenori YUYAMA

Director
Nippon Physical Acoustics Ltd.,
Japan,
Joined Mar 2002
2
04:58 Mar-12-2002
Re: Help Wanted: NDT for steel corrosion inside Concrete
: Hello, Everyone!
.
: Is there a NDT technique that can detect the steel corrosion under a concrete layer?
: There is a steel plate underneath a concrete layer.
: The thickness of the concrete is uniform (around 1 inch).
: The thickness of the steel plate is about half an inch.
: The potentail problem may be corrosion pots on the steel plate or even through holes.
: It is only available to scan from the surface of the concrete.
.
: Any suggestion is welcome.
.
: Thanks in advance.
.
: Weihua Mao


Dear Everyone:

Acoustic emission(AE) is an ideal method to detect corrosion of steel inside concrete. Elastic waves (AE) is produced by corrosion of steels and can be detected by AE sensors attached on the concrete surface. Another mechansim that produces larger signals is local micro cracking that takes place along the interface between the steel and the concrete. Since the volume increses remakabley (sometimes 700 percen) in the corrosion processes (formation of oxicides on the steel surface), the concrete can be easily cracked and produces many elastic(AE) signals. These signals can be de detected at a distance of 2-5 meter with an appropriate AE sensor.

For more details, please refer to PACndt.com or pacjapan.com
.




 
 Reply 
 
Riccardo Scottini
Riccardo Scottini
05:40 Mar-12-2002
Re: Help Wanted: NDT for steel corrosion inside Concrete
Dear Mr Weihua Mao,

RTD-INCOTEST is the inspection system you are looking for.
This inspection technique is based on Pulsed Eddy Current and it is especially designed for corrosion detection in carbon and low alloy steel plates underneath insulation such as fireproofing (Ex sphere tanks supports “leg” and vessels skirts) without any insulation removal.
For any further information please contact me.
Best regards,
Riccardo Scottini



 
 Reply 
 
tareq
tareq
02:19 Jul-11-2002
Re: Help Wanted: NDT for steel corrosion inside Concrete
Is there a NDT technique that can detect the steel corrosion under a concrete layer?



 
 Reply 
 

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