Testing & Acceptance of Concrete

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.