Attachment C - Biddding Specification 1-23-25

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THE CITY OF SUNNY ISLES BEACH PROJECT NO. 21-1011 BUILDING DEPARTMENT RELOCATION TO ANNEX Project No. 21-1011 November 2024 033000 Cast-in-Place Concrete-17 9. Additional Tests: Testing and inspecting agency shall make additional tests of concrete when test results indicate that slump, air entrainment, compressive strengths, or other requirements have not been met, as directed by Engineer. a. If compressive strength requirements are not met, steps shall be taken to increase average of subsequent strength test results. Engineer shall have right to order a change in proportions of mix for remaining work. Engineer shall also have right to require conditions of temperature and moisture necessary to secure required strength. b. If any strength test of laboratory-cured cylinders falls below specified compressive strength by more than 500 psi or if tests of field-cured cylinders indicate deficiencies in protection or curing, steps shall be taken to assure that the load-carrying capacity of structure is not jeopardized. c. If likelihood of low-strength concrete is confirmed and computations indicate that load-carrying capacity may have been significantly reduced, tests of cores drilled from area in question may be required in accordance with ASTM C 42. In such cases, three cores shall be taken for each strength test more than 500 psi below specified compressive strength. If concrete in structure will be dry under service condition, cores shall be air dried (temperature 60° to 80° F., relative humidity less than 60%) for 7 days before test and shall be tested dry. If concrete in structure will be more than superficially wet under service conditions, cores shall be immersed in water for at least 40 hours and be tested wet. d. Concrete in an area represented by core tests shall be considered structurally adequate if average of three cores is equal to at least 85% of specified compressive strength and if no single core is less than 75% of specified compressive strength. To check testing accuracy, locations represented by erratic core strengths may be retested. e. If criteria of paragraph (d) are not met, and if structural adequacy remains in doubt, the Engineer may order load tests as outlined in ACI 318 for questionable portion of structure or require other appropriate action. f. All costs associated with performing analytical investigations, core testing and load testing shall be paid for by Contractor. 10. Nondestructive Testing: Impact hammer, Sonoscope, or other nondestructive device may be permitted by Engineer but will not be used as sole basis for approval or rejection of concrete. 11. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.