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166 of 234 <br />REPORT OF TESTS <br />Hardness ofReinforcing Steel Bar: <br />m No. ' Bar Size Hardness. BHN Conversion To Tensile Strength, PSI <br />1 11 193 91,0002 9 248 ]19,000 <br />ASTM A 615 Grade 40 Tensile Strength Requirements: <br />ASTM A 615 Grade 60 Tensile Strength Requirements: <br />ASTM A 615 Grade 75 Tensile Strength Requirements <br />70,000 Min <br />90,000 Min <br />100,000 Min <br />-NOTE L It was stated that this structure was built in the year 1966. At that time the current most common rebarcontrolling specifications of ASTM A 615 and ASTM A 706 did not yet exist. The existing reinforcing steelstandard ofrecord was ASTM A 15-66 (latest upgrade 1/1/66). There were three steel grades covered by thisstandard: 1) structural (most similar to A 36 structural steel), 2) intermediate (most similar to high strength lowalloy structural steel) and 3) hard (similar to Grade 60 reinforcing steel bar). In 1958 two additional standards werefirst published, ASTM A 431 which covered grade 75 bars and ASTM A 432 which covered grade 60 steel. ThesetWO SpecificationS were withdrawn in 1968 and replaced by ASTM A615. Sample 1 would have complied with theASTM A 432 Standard and sample 2 would very likely have complied with the ASTM A 431 Standard. <br />NOTE 2: By current standards the tensile strenglh determination ofthe tested bars indicates that the 1 samplewould comply with the grade 60 requirements of the ASTM A 615 Specification for reinforcing steel bars and 2sample might comply with either grade 60 or 75 of the ASTM A 615. <br />Respectfully Submitted, <br />by Reea)M,rnOL 9 .,40£ 2.n ;, <br />Raymon& E. Greene, PE <br />Metallurgical Engineer <br />4tfi[CALFOB