Steel reinforcing bars are designed to absorb the stress and weight of concrete structures such as bridges and buildings. ASTM D615 is a testing standard that provides dimensional, chemical, and physical requirements for plain and deformed carbon steel bars manufactured for concrete reinforcement. Deformed bars include surface protrusions to prevent longitudinal movement after being placed in concrete, while plain bars are smooth sided. These products may be supplied in cut lengths or coils, and are engineered for the express purpose of building and construction. 

While ASTM A615 references ASTM A370 and ASTM E290 for tensile and bend testing respectively, this standard includes specific procedures relevant to performing these tests on plain and deformed bar. These tests are performed in order to determine physical properties such as strength, elongation, and satisfactory surface condition after bending. Notably, bars produced in accordance with ASTM A706/A706M are also considered to be in conformance to this standard. 

Procedure:The specimen is manufactured as per the specified measurements, and limits are specified to test its performance. The specimen is observed for any deformation and its chemical composition is determined. The tensile properties of the bars are studied. The tension and bent tests are performed. The results are verified by retesting the sample and presented as per international standards.

Data:The method covers the certification, sampling, testing, and inspection of the specimen within the set limits. 

ASTM A615/A615M tensile strength test and bending testing machine.   

Conclusion:

ASTM A615/A615M-20 test method is specifically important for the quality assurance and durability check of steel bars.