The reason for using two steel bars is to make it possible to measure corrosion
potential (presented elsewhere) and corrosion mass loss using the same specimen.
The bar emerging out from the two sides is used for the corrosion potential measurement
only since the two edges are not embedded into the concrete and are
not under chloride attack. Therefore, in order to find the mass loss using the same
specimen a separate steel bar was embedded completely into the concrete. This was
done to obtain more reliable and accurate results. Uniform chloride content has
been used as corrosion initiator considering the corrosion cell as a fused anode
cathode micro-cell system. The oxygen concentration available for corrosion at
the surface of rebar embedded in concrete was limited by varying water to cement
ratios, cover depths and pre admixed chloride concentrations as shown in Table 2.