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Technical Discussions
MRyzhevs@mta-esa.org
MRyzhevs@mta-esa.org
05:44 Jun-27-2003
NDT in concrete tunnel of New York City

My name is Michail Ryzhevskiy. I am a Tunnel Engineer. I am not specialist
in the field of NDT, but I heard a lot about the capacity of these methods.
Right now I am working on the most ambitions projects in New York City. We
design new subway line in Manhattan. One great part of this project is the
rehabilitation of existing tunnel passed under the ocean to connect Queens
to Manhattan. To identify the defects in this tunnel I have proposed
Ultrasonic Method in which, I believe, you are expert. Existing tunnel has
the concrete tunnel lining about 0.8-1.2 m thickness. The tunnel is leaking.
In the tunnel a lot of water inflow. In many places the water rusted,
because of the corrosion steel inside the concrete structure. The purposes
to apply the Ultrasonic method are: identify cracks in concrete, voids
behind the concrete, joints in the surrounding tunnel rock, corrosion of
steel elements, real thickness of tunnel lining.

Could you be so kind as advice me if it is possible with the Ultrasonic
technology, and how much time it will take, let say for 1m length of the
tunnel (diameter 5.6m), and approximate cost of application this method
(from you experience).

Thank you in advance for you expert advice.

Michael Ryzhevkiy



 
 Reply 
 
Jamie Gauthier
Jamie Gauthier
07:01 Jun-27-2003
Re: NDT in concrete tunnel of New York City



 
 Reply 
 
Massimo Schinelli
Massimo Schinelli
09:10 Jun-28-2003
Re: NDT in concrete tunnel of New York City
According to our experience in many European concrete tunnels the use of the ultrasonic method is not the best way to asses the actual condition of the concrete lining.
A very useful technique is instead ground penetrating radar, especially if the survey is perform with more than one antenna (with different frequencies).
On the other hand ultrasonic method could be more suitable to analyse very small and localised portions of the lining where the radar survey has found particular defects or problems.
Should you need any further information please do not hesitate to contact me.

Massimo Schinelli
SCHINELLI CONSULTING
Viale Resegone, 15/D
20020 ARESE (Mi) Italy
Tel. +39 02 93581617
Fax +39 02 93588922


 
 Reply 
 
Franc Buijsen
Franc Buijsen
00:16 Jun-30-2003
Re: NDT in concrete tunnel of New York City
: My name is Michail Ryzhevskiy. I am a Tunnel Engineer. I am not specialist
: in the field of NDT, but I heard a lot about the capacity of these methods.
: Right now I am working on the most ambitions projects in New York City. We
: design new subway line in Manhattan. One great part of this project is the
: rehabilitation of existing tunnel passed under the ocean to connect Queens
: to Manhattan. To identify the defects in this tunnel I have proposed
: Ultrasonic Method in which, I believe, you are expert. Existing tunnel has
: the concrete tunnel lining about 0.8-1.2 m thickness. The tunnel is leaking.
: In the tunnel a lot of water inflow. In many places the water rusted,
: because of the corrosion steel inside the concrete structure. The purposes
: to apply the Ultrasonic method are: identify cracks in concrete, voids
: behind the concrete, joints in the surrounding tunnel rock, corrosion of
: steel elements, real thickness of tunnel lining.
.
: Could you be sokind as advice me if it is possible with the Ultrasonic
: technology, and how much time it will take, let say for 1m length of the
: tunnel (diameter 5.6m), and approximate cost of application this method
: (from you experience).
.
: Thank you in advance for you expert advice.
.
: Michael Ryzhevkiy

Dear sir,

I suggest you to contact a company called ANDEC in Toronto Canada. They have some experts on concrete testing. You can reach them at: +1 416 213 8000

Regards

Franc
Servicing europe ndt


.



 
 Reply 
 
Kavitha
Kavitha
06:31 Jul-06-2003
Re: NDT in concrete tunnel of New York City
Sir,
I'm working on IE for concrete tunnela and pipes. I've come across some references abo GPR for concrete tunnels, but I've not found any article or journal papers which gives details about GPR used specifically for detecting defects in concrete tunnel. All I've seen is GPR being used for detecting the location of concrete tunnels or objects as such buried in the ground. Can you give me details of any journal papers or case-studies for this.

Thaking you in advance,
Kavitha

: There are several methods that could be used to identify the flaws you mentioned in the concrete lining of the tunnel. Some of these methods are:
.
: GPR-Ground Penetrating Radar - An excellent method for determining problems in the concrete. Also gives an excellent image (digital) of the indications that are found. This method also will identify rebar, tension cables, power and data conduit, etc.
.
: Ultrasonics- Using the appropriate transducers - Some indications can be located in concrete.
.
: As for identifying problems in the structural steel behind the concrete liner, more information on access to it would be required to pick the best method.
.
: If you have any questions that you would like to discuss in detail, such as productivity, cost, etc, please email me with a number to call you.
.
: Best Regards,
.
: Jamie Gauthier
: IRISNDT Corp.
: Manager, Advanced NDT Technologies
: Tel: 780-437-2022
: Cell: 780-699-0503
: Fax: 780-430-6022
.



 
 Reply 
 
Larry D. Olson
Larry D. Olson
01:21 Jul-08-2003
Re: NDT in concrete tunnel of New York City
: My name is Michail Ryzhevskiy. I am a Tunnel Engineer. I am not specialist
: in the field of NDT, but I heard a lot about the capacity of these methods.
: Right now I am working on the most ambitions projects in New York City. We
: design new subway line in Manhattan. One great part of this project is the
: rehabilitation of existing tunnel passed under the ocean to connect Queens
: to Manhattan. To identify the defects in this tunnel I have proposed
: Ultrasonic Method in which, I believe, you are expert. Existing tunnel has
: the concrete tunnel lining about 0.8-1.2 m thickness. The tunnel is leaking.
: In the tunnel a lot of water inflow. In many places the water rusted,
: because of the corrosion steel inside the concrete structure. The purposes
: to apply the Ultrasonic method are: identify cracks in concrete, voids
: behind the concrete, joints in the surrounding tunnel rock, corrosion of
: steel elements, real thickness of tunnel lining.
.
: Could you be sokind as advice me if it is possible with the Ultrasonic
: technology, and how much time it will take, let say for 1m length of the
: tunnel (diameter 5.6m), and approximate cost of application this method
: (from you experience).
.
: Thank you in advance for you expert advice.
.
: Michael Ryzhevkiy
.
Dear Sir,

We have conducted a number of tunnel investigations using NDT methods including Ground Penetrating Radar, Impact Echo, Spectral Analysis of Surface Waves, Slab Impulse Response. We also use Galvapulse technology for corrosion surveys in addition to half-cell surveys. Two of the tunnels we have worked on are located in New York City. You can see these methods at www.olsonengineering.com and see many of the instruments at www.olsoninstruments.com . I would be pleased to discuss these further with you. Our firm specializes in NDE consulting and instruments for civil engineering applications. Personally, I am one of the ASCE course instructors on Structural Condition Assessment of Existing Structures. I look forward to your reply.

Larry D. Olson, PE
Olson Engineering, Inc.
tel 303-423-1212
e-mail - ldolson@olsonengineering.com


 
 Reply 
 
C. L. Barnes
R & D
Dalhousie University, Canada, Joined May 2002, 6

C. L. Barnes

R & D
Dalhousie University,
Canada,
Joined May 2002
6
02:24 Jul-11-2003
Re: NDT in concrete tunnel of New York City
I have been using GPR to assess bridge decks for corrosion related damage for eight years now. In my experience, GPR has not been very useful for directly detecting thin cracks and delaminations. However, it is very useful in detecting regions of relatively higher moisture and chloride ion concentrations in the concrete, which are typically associated with the presence of corrosion induced delaminations. Larger voids can be imaged with GPR,
but it depends on the depth at which they are located and the frequencies you are scanning with. It is a very useful method for imaging the internal reinforcement in the structure and measuring layer thickness (when calibrated with core data).

Stress wave based methods such as impact-echo or slab impulse-response tests tend to work very well for directly detecting and locating delaminations, voids, honeycombing, debonding from substrate, etc. in concrete walls and tunnel linings. I can provide you with some contact information if you email me back with a request (christopher.barnes@dal.ca).

Best regards,

Christopher L. Barnes, M.A.Sc., P.Eng.

--------------
: Sir,
: I'm working on IE for concrete tunnela and pipes. I've come across some references abo GPR for concrete tunnels, but I've not found any article or journal papers which gives details about GPR used specifically for detecting defects in concrete tunnel. All I've seen is GPR being used for detecting the location of concrete tunnels or objects as such buried in the ground. Can you give me details of any journal papers or case-studies for this.
.
: Thaking you in advance,
: Kavitha
.
: : There are several methods that could be used to identify the flaws you mentioned in the concrete lining of the tunnel. Some of these methods are:
: .
: : GPR-Ground Penetrating Radar - An excellent method for determining problems in the concrete. Also gives an excellent image (digital) of the indications that are found. This method also will identify rebar, tension cables, power and data conduit, etc.
: .
: : Ultrasonics- Using the appropriate transducers - Some indications can be located in concrete.
: .
: : As for identifying problems in the structural steel behind the concrete liner, more information on access to it would be required to pick the best method.
: .
: : If you have any questions that you would like to discuss in detail, such as productivity, cost, etc, please email me with a number to call you.
: .
: : Best Regards,
: .
: : Jamie Gauthier
: : IRISNDT Corp.
: : Manager, Advanced NDT Technologies
: : Tel: 780-437-2022
: : Cell: 780-699-0503
: : Fax: 780-430-6022
: .
.



 
 Reply 
 
M. J. Patek
M. J. Patek
04:05 Jul-16-2003
Re: NDT in concrete tunnel of New York City
: You may find an answer at the following location.
WWW.impact-echo.com.

Good Luck
mjp


 
 Reply 
 
A.B.HEMALATHA
A.B.HEMALATHA
09:51 Jan-06-2005
Re: NDT in concrete tunnel of New York City
: There are several methods that could be used to identify the flaws you mentioned in the concrete lining of the tunnel. Some of these methods are:
.
: GPR-Ground Penetrating Radar - An excellent method for determining problems in the concrete. Also gives an excellent image (digital) of the indications that are found. This method also will identify rebar, tension cables, power and data conduit, etc.
.
: Ultrasonics- Using the appropriate transducers - Some indications can be located in concrete.
.
: As for identifying problems in the structural steel behind the concrete liner, more information on access to it would be required to pick the best method.
.
: If you have any questions that you would like to discuss in detail, such as productivity, cost, etc, please email me with a number to call you.
.
: Best Regards,
.
: Jamie Gauthier
: IRISNDT Corp.
: Manager, Advanced NDT Technologies
: Tel: 780-437-2022
: Cell: 780-699-0503
: Fax: 780-430-6022
.
sir,
i am going to do project in non destructive testing.the testing should be in lab.can u suggest some testing concept


 
 Reply 
 

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