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178 of 234 <br />REPORT OF TESTS <br />Hardneu of Reinforcing Steel Bar: <br />ID Nol Bar Size Hardness. BHN Conversion To Tensile Strength. PSI <br />lA 11 227 107,000 <br />18 3 154 74,000 <br />2A 9 248 119,000 <br />2A-2 9 245 118,000 <br />2A-3 9 260 125.000 <br />Average =120,700 <br />2B 3 166 <br />ASTM A 615 Grade 40 Tensile Strength Requirements: <br />ASTM A 615 Grade 60 Tensile Strength Requirements: <br />ASTM A 615 Grade 75 Tenfile Strength Requiremen15 <br />82.000 <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 thal time the current most common rebar <br />controlling specifications of ASTM A 615 and ASTM A 706 did not yet exist. The existing reinforcing steel <br />standard of record was ASTM A 15-66 (latest upgrade 1/1/66). There were three steel grades covered by this <br />standard: 1) structural (most similar to A 36 structural steel), 2) intennediate (most dmilar to high strength low <br />alloy structural steel) and 3) hard (similar to Grade 60 reinforcing steel bar). Test samples 1 A and 2A most closely <br />compare to the hard grade and samples 1 B and 28 most closely compare to the intermediate grade. <br />NOTE 2: By current standards the tensile strength determination ofthe tested bars indicates that the I A sample <br />would comply with the grade 60 requirements ofthe ASTM A 615 Specification for reinforcing steel bars and 18 <br />sample might comply with either grade 60 or 75 of the ASTM A 615. The 2A and 2B samples comply with the 40 <br />grade of the ASTM A 615 Standard. <br />Respectfully Submitted, <br />b¥ fdhwAL E .Su-0 <br />Rayniond E. Greene, PE <br />Metallurgical Engineer <br />1681 )%...................