Conduct 28- day and 56- day (AAAP and Prevention Level Z mixtures only) compressive strength testing of two acceptance cylinders according to PTM No. 604. If for any reason two testable acceptance cylinders are not available for compressive strength testing, obtain two cores of the representative concrete within 3 working days as directed, and at no additional cost to the Department. Conduct 28- day compres sive strength testing of the cores according to PTM No. 604. The Department will accept the lot of concrete if the average 28-day acceptance cylinder compressive strength test result is greater than or equal to the 28- day minimum mix design compressive strength specified in Table A and if the average 28-day QC compressive strength requirements specified in Section 704.1(d)4.b have been met. If the average 28-day acceptance cylinder compressive strength test result is less than the 28- day minimum mix design compressive strength specified in Table A, acceptance of the concrete lot will be based on the procedures as specified in Section 110.10.
sample for each type of concrete specified in Table B and a minimum of one verification test for every ten acceptance samples thereafter. Verification testing will consist of testing for temperature, air content, and compressive strength. Verification tests will be performed on concrete from the same sample used for acceptance testing. The Representative will obtain the temperature of the sample concurrently with the acceptance sample. Immediately after an acceptable air content test result for acceptance is obtained, the Representative will test the sample for air content according to AASHTO T 196 or T 152 using the same air meter . The Representative will mold two verification cylinders according to PTM No. 611. Standard cure the verification cylinders along with the acceptance cylinders according to PTM No. 611, Section 12 .1, for 28 days. The Representative will c onduct 28- day compressive strength testing of the verification cylinders according to PTM No. 604. Conduct the testing at the same time the acceptance cylinders are tested and using the same equipment. Verification test results will be compared to the associated acceptance test results and will not be used to determine acceptance of the lot. If there is a difference in test results of more than 5F for temperature, 1.0% for air content, or 500 pounds per square inch for compressive strength, the Representative will immediately review the testing procedures, equipment, and personnel used in the acceptance testing and implement corrective measures to ensure the tests are performed within the prescribed