You have to find a chart that will indicate the weight per unit of measure for the appropriate rebar size. Than take that and multiply it by the the length of the rebar. For example, a #4 rebar weighs 0.668 lbs/ft. If you have 5 @ 20-00 pieces that is 0.
2.5.2. Gravimetric Weight Loss Method The gravimetric weight loss measurements were performed as per the ASTM standard. The surface cleaned steel rebars were taken for this study. The initial weight and dimension of the steel rebars were noted, then the steel rebars were immersed in chloride cont...