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REPORT OF TESTS <br />Hardness ofReinforcing Steel Bar: <br />ID No.Bar Size Hardness. BRIN Conversion To Tensile Strength, PSI <br />1 11 193 <br />91,0002 9 248 <br />I j 9,000 <br />ASTM A 6 I 5 Grade 40 Tensile Strength Requirements:ASTM A 615 Grade 60 Tensile Strength Requirements:ASTM A 615 Grade 75 Tensile Strength Requirements <br />70,000 Min <br />90,000 Min <br />100,000 Min <br />NOTE 1: 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 of record 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 suuctural steel) and 3) hard (similar to Grade 60 reinforcing steel bar). In ]958 two additiona] 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 Thesetwo specifications were withdrawn in 1968 and replaced by ASTM A 615. 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 strength determination of the tested bars indicates that the I 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 />Metallurgical Engineer lut 1681 9% <br />4 'ALLURGS*4;7 <br />4120«-fr/urr44 Or©,-LA i.tr i <br />Raymond E. Greene, PE