Concrete detoriation and reinforcement corrosion occur due to many reasons. These two factors weaken the structural strength and result in the premature failiure of the structures situated in aggressive environments. The condition of the concrete as well as rebar embeded in it has to be assesed befor taking up any remedial or repair stratergy. Several electrochemical non-destructive techniques are vailable for this purpose. Some of them lead to indirect conclusions and some lead to partial quantification of corrosion. Radiographic technique is one of the promising non-destructive methods for determining the porostity of concrete, voids in the cement grout, rusting of mild steel, rusting of prestressing steel and snapping of prestressing wires. Laboratory and field experiments were carried out on model slabs, beams and concrete structures to study the various aspects of concrete corrosion. A 6 Mev high energy equipment was used for this purpose. Concrete thickness upto 30 cm was radiographed. Suitable safety measures were undertaken while carrying out the above work. The data obtained during this radiographic work and x-ray photographs were analysed as per requisites of photogrametric data analysis and results are presented in this paper. This pioneering work has yielded very intresting and usefull results regarding the quality of concrete and grouting, condition of prestressed wires and other non-prestressed steel
