Testing & Acceptance of Concrete

Frequency Of Testing
Samples for strength tests:
  • Once per day
  • Once for each 150 cubic yards placed
  • Once for each 5000 square feet of surface area placed
Minimum Number of Strength Tests:
  • Five strength tests from five randomly selected batches or from each batch if fewer than five batches.
  • If total quantity is less than 50 cubic yards, strength tests may be waived by building official.
Acceptable Criteria
Strength level satisfactory if BOTH of the following are met:
  • Average of three consecutive strength tests equal or exceed specified fc.
  • No single strength test below specified fc by more than 500 psi.
  • Strength Test = Average of two cylinder strengths
Special Inspector
  • Field personnel must be approved by the Chief Building Official.
  • Must report any unresolved discrepancies to the Chief Building Official within 24 hours of the incident.
  • Must submit reports to the Chief Building Official within 72 hours of each test.
  • Must utilize a testing lab approved by the Chief Building Official.