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DocuSign Envelope ID:07A4359F-6D47-4987-B1F1-BF667ACBB3BA <br /> a. One test for each composite sample, but not less than one test for each day's pour <br /> of each concrete mixture. <br /> 4. Concrete Temperature: ASTM C 1 064/C 1 064M: <br /> a. One test hourly when air temperature is 40 deg F and below or 80 deg F and <br /> above, and one test for each composite sample. <br /> 5. Unit Weight: ASTM C567/C567M fresh unit weight of structural lightweight concrete. <br /> a. One test for each composite sample, but not less than one test for each day's pour <br /> of each concrete mixture. <br /> 6. Compression Test Specimens: ASTM C31/C31M: <br /> a. Cast and laboratory cure two sets of three 6-inch by 12-inch or 4-inch by 8-inch <br /> cylinder specimens for each composite sample. <br /> 7. Compressive-Strength Tests: ASTM C39/C39M. <br /> a. Test one set of two laboratory-cured specimens at seven days and one set of two <br /> specimens at 7 days. <br /> b. Test one set of two laboratory-cured specimens at seven days and one set of two <br /> specimens at 28 days. <br /> C. A compressive-strength test to be the average compressive strength from a set of <br /> two specimens obtained from same composite sample and tested at age indicated. <br /> 8. When strength of field-cured cylinders is less than 85 percent of companion laboratory- <br /> cured cylinders, Contractor to evaluate operations and provide corrective procedures for <br /> protecting and curing in-place concrete. <br /> 9. Strength of each concrete mixture will be satisfactory if every average of any three <br /> consecutive compressive-strength tests equals or exceeds specified compressive strength, <br /> and no compressive-strength test value falls below specified compressive strength by <br /> more than 500 psi if specified compressive strength is 5000 psi, or no compressive <br /> strength test value is less than 10 percent of specified compressive strength if specified <br /> compressive strength is greater than 5000 psi. <br /> 10. Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may <br /> be permitted by Architect but will not be used as sole basis for approval or rejection of <br /> concrete. <br /> 11. Additional Tests: <br /> a. Testing and inspecting agency to make additional tests of concrete when test <br /> results indicate that slump, air entrainment, compressive strengths, or other <br /> requirements have not been met, as directed by Architect. <br /> b. Testing and inspecting agency may conduct tests to determine adequacy of <br /> concrete by cored cylinders complying with ASTM C42/C42M or by other <br /> methods as directed by Architect. <br /> Orange County Solid Waste Drainage Repairs DAA 2200365/TRC 017055.0000.0000 <br /> Drainage Repair Project November 2023 <br /> Orange County, NC 033000-18/19 <br />