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DocuSign Envelope ID: 313DA256 -1EDE- 4396- A716- 4C53B809027E <br />JERRY M. PASSMORE CENTER ADDITION AND RENOVATION <br />HILLSBOROUGH, NORTH CAROLINA <br />2. Slump: ASTM C 143/C 143M; one test at point of placement for each composite sample, <br />but not less than one test for each day's pour of each concrete mixture. Perform <br />additional tests when concrete consistency appears to change. <br />3. Air Content: ASTM C 231, pressure method; one test for each composite sample, but not <br />less than one test for each day's pour of each concrete mixture. <br />4. Concrete Temperature: ASTM C 1064/C 1064M; one test hourly when air temperature is <br />40 deg F (4.4 deg C) and below and when it is 80 deg F (27 deg C) and above, and one <br />test for each composite sample. <br />5. Compression Test Specimens: ASTM C 31 /C 31M; cast and laboratory cure one set of <br />three standard cylinder specimens for each composite sample. <br />6. Compressive - Strength Tests: ASTM C 39/C 39M; test one specimen at seven days and <br />two specimens at 28 days. <br />a. A compressive - strength test shall be the average compressive strength from two <br />specimens obtained from same composite sample and tested at 28 days. <br />C. Strength of each concrete mixture will be satisfactory if average of any three consecutive <br />compressive - strength tests equals or exceeds specified compressive strength and no <br />compressive - strength test value falls below specified compressive strength by more than 500 psi <br />(3.4 MPa). <br />D. Test results shall be reported in writing to Architect, concrete manufacturer, and Contractor <br />within 48 hours of testing. Reports of compressive - strength tests shall contain Project <br />identification name and number, date of concrete placement, name of concrete testing and <br />inspecting agency, location of concrete batch in Work, design compressive strength at 28 days, <br />concrete mixture proportions and materials, compressive breaking strength, and type of break <br />for both 7- and 28 -day tests. <br />E. Nondestructive Testing: Impact hammer, sonoscope, or other nondestructive device may be <br />permitted by Architect but will not be used as sole basis for approval or rejection of concrete. <br />F. Additional Tests: Testing and inspecting agency shall make additional tests of concrete when <br />test results indicate that slump, air entrainment, compressive strengths, or other requirements <br />have not been met, as directed by Architect. <br />G. Concrete paving will be considered defective if it does not pass tests and inspections. <br />H. Additional testing and inspecting, at Contractor's expense, will be performed to determine <br />compliance of replaced or additional work with specified requirements. <br />I. Prepare test and inspection reports. <br />3.12 REPAIRS AND PROTECTION <br />A. Remove and replace concrete paving that is broken, damaged, or defective or that does not <br />comply with requirements in this Section. Remove work in complete sections from joint to <br />joint unless otherwise approved by Architect. <br />CONCRETE PAVING 321313 - 12 <br />