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- since 1996 -
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Technical Discussions
Velu Perumal
Consultant, Research
National University of Singapore ,Singapore, Singapore, Joined Jun 2003, 1

Velu Perumal

Consultant, Research
National University of Singapore ,Singapore,
Singapore,
Joined Jun 2003
1
05:39 Aug-26-2003
Detecting thermal crack by NDT methods

Dear All,
I am working on thermal cracks on concrete.I would like to measure thermal stress and strains,crack precisely.Ofcourse surface cracks we can measure any methods. But thermal cracks are haapened internally.Can i measure thermal cracks using any one of current NDT methods.We already conducted thermal shock experiment (Circular Ring Specimen) using AE. Currently we have Acoustic Emmission(AE),UPV & Impact echo.please give your valuable suggestions


    
 
 Reply 
 
Bastiaan Janssen
NDT Inspector, Managing Xray micro-Tomography
NRG, Netherlands, Joined Jul 2003, 4

Bastiaan Janssen

NDT Inspector, Managing Xray micro-Tomography
NRG,
Netherlands,
Joined Jul 2003
4
03:13 Aug-27-2003
Re: Detecting thermal crack by NDT methods
Dear Velu Perumal,

Depending on size of test samples, erg. drilled core cylinders, I would suggest micro tomography,.Using x-ray or gamma ray's and a focal spot for the radiation source, this results in magnified projections wich can be reconstructed, using using many pictures form differend angeles, into a 3D-dataset. We have obtained internal crack visualisations of concrete cylinders diameter 5 cm, with a resolution of 1/10 m; Depending on x-ray energy, source spotsize and sample diameter...

Best regards.
(On holliday until october)
http://www.nrg-nl.com/product/ppt/tomo/index.html

----------- Start Original Message -----------
: Dear All,
: I am working on thermal cracks on concrete.I would like to measure thermal stress and strains,crack precisely.Ofcourse surface cracks we can measure any methods. But thermal cracks are haapened internally.Can i measure thermal cracks using any one of current NDT methods.We already conducted thermal shock experiment (Circular Ring Specimen) using AE. Currently we have Acoustic Emmission(AE),UPV & Impact echo.please give your valuable suggestions
------------ End Original Message ------------




    
 
 Reply 
 
R.Malathy, Senior Lecturer in Civil Engineering, Kongu Engineering college, Peru
R.Malathy, Senior Lecturer in Civil Engineering, Kongu Engineering college, Peru
09:32 Feb-26-2004
Re: Detecting thermal crack by NDT methods
Dear Sir,

We have TICO ultrasonic Pulse velocity tester. How to measure the thermal cracks.


    
 
 Reply 
 
zuhudruba
zuhudruba
03:17 Apr-08-2005
Re: Detecting thermal crack by NDT methods
----------- Start Original Message -----------
: Dear All,
: I am working on thermal cracks on concrete.I would like to measure thermal stress and strains,crack precisely.Ofcourse surface cracks we can measure any methods. But thermal cracks are haapened internally.Can i measure thermal cracks using any one of current NDT methods.We already conducted thermal shock experiment (Circular Ring Specimen) using AE. Currently we have Acoustic Emmission(AE),UPV & Impact echo.please give your valuable suggestions
------------ End Original Message ------------




    
 
 Reply 
 
TERD
TERD
08:21 Jul-03-2005
Re: Detecting thermal crack by NDT methods
----------- Start Original Message -----------
: Dear Velu Perumal,
: Depending on size of test samples, erg. drilled core cylinders, I would suggest micro tomography,.Using x-ray or gamma ray's and a focal spot for the radiation source, this results in magnified projections wich can be reconstructed, using using many pictures form differend angeles, into a 3D-dataset. We have obtained internal crack visualisations of concrete cylinders diameter 5 cm, with a resolution of 1/10 m; Depending on x-ray energy, source spotsize and sample diameter...
: Best regards.
: (On holliday until october)
: http://www.nrg-nl.com/product/ppt/tomo/index.html
: : Dear All,
: : I am working on thermal cracks on concrete.I would like to measure thermal stress and strains,crack precisely.Ofcourse surface cracks we can measure any methods. But thermal cracks are haapened internally.Can i measure thermal cracks using any one of current NDT methods.We already conducted thermal shock experiment (Circular Ring Specimen) using AE. Currently we have Acoustic Emmission(AE),UPV & Impact echo.please give your valuable suggestions
------------ End Original Message ------------




    
 
 Reply 
 

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