Frequency Of Testing
Samples for strength tests:
- Once per day
- Once for every 150 cubic yards placed
- Once for every 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 the 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 (Strength Test = Average of two cylinder strengths)
- No single strength test below specified fc by more than 500 psi.
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.