Reinforcement, Rod Quality Check at Site

 

       Now a days Thermo-Mechanically Treated (TMT) bars are used on reinforced concrete. Before Placing or Buying we must check the quality of reinforcement there are some examination should be done before selecting steel bar for a construction site.

Examine:
1)      Weight Per Running Meter
2)      Bend Test
3)      Re bend Test

    1)      Weight Per Running Meter

-          Collect a 3 sample bundle rod.
-          Cut the sample of 1 meter length form each bundle.
-          Weight these sample rod and record on note.
-          Now calculate theoretical weight of rod which is given by
                W= (DxD)/162.27
                    Where, D= Dia of Rod in mm.
                      Unit=Kg/m
-          Compare sample rod weight and theoretical weight it should be same.

2)      Bend Test
-          Collect a sample of appropriate length not less than 1m.
-          Bend it for first 90, 135 & 180 Degree.

Bend Test

Check for crack at bent section. If crack occur than it get failed. Crack should not occur at 180 degree.

3)      Re bend Test
-          After bend test we can re bend the same sample which is used for bend test.
-          Again repeat same process for re bend that is 180, 135 & 90 Degree
 

Re Bend Test

Check for crack at bent section. If crack occur than it get failed. Crack should not occur at 90 degree