Defective grouting in Pretensioned Girders  

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The gamma-ray tomography technique developed by THASA is also a valuable tool for the study of the condition of grouting in PT girders and of corrosion in the strands.

 

 

 

 

 

 

 

 

 

 

Below we show an example of such a successful study performed at one of the largest bridges in Argentina (Work contracted by COWI International).

Plate 1 shows void in one of the two ducts while ducts seen in plate 8 are properly filled.  

Diagram shows location of the gammagraphies along one of the beams.