How many test cylinders are required to be taken per day on a normal job?
The number is usually specified in terms of the number of cubic yards. ACI 301 requires 1 test (2 specimens) for every 100 cubic yards or fraction thereof placed in any one day. ACI 318 requires 1 test (2 specimens) per 150 cubic yards but at least one test per day. For mass concrete the common practice is to make 1 or 2 tests per shift. Tests may be made on standard-cured specimens, field-cured specimens or both, depending on the job requirements.