How to check Quality of steel Bar at construction site
TOR steel is one of the grade of steel used in Concrete reinforced. It is a kind of high Adherence steel . Other Type of steel are used for less resistance concrete. Thermo -mechanically treated ( TMT) bars are a type of corrosion resistant steel reinforcing bar used in concrete construction
Testing of Tor Steel in Laboratory
- Chemical Analysis
- Elongation
- Ultimate Tensile Test
- 0.2% Proof stress / Yield Stress
Field Test
- Mass Per meter Run
- Bend Test
- Rebend Test
Mass Per meter Run
Cut the samples of 1 meter in length, minimum 4 number of bars from different bundles.Measure the length of cut bars by measuring it on at-least 4 sides and average out the length of bar. Weight the bar on weight scale and record it in register.Calculate the actual average weight per meter of bar for at-least 3 samples.Compare the result of it with theoretical weight given in IS 1786 .Check the variation in weight is within limit or not as per IS specification.
Bend Test
Bend test should be carried out as specified in IS 1599 and using mandrels of size specified in IS 1786 .Rebar sample should be bent at 180 degree as per procedure stated in IS 1599.
After bending the bar check the surface of bar opposite to bend side (which got tension, elongated due to bending) for cracks and rupture visible to a person with normal or corrected vision.If there is no sign of rupture and cracks, rebar meets the requirement of bend test.
Rebend Test
First bend the bar to including angle of 135 degree.Keep it in boiling water at 100 degree for 30 minutes.Then cool it down for some time.After cooling bent it back to including angle of 157.5 degree The rebar should not show any rupture or cracks to a person with normal or corrected vision.
Mandrel to use for Rebend test as specified in IS 1786