The plans, specifications, and special provisions identify the required tests for the aggregate. Test methods are defined in TxDOT’s . The sampling and testing locations and frequencies are in TxDOT’s Construction Contract Administration Manual (2002),

Item 6.1 of the Standard Specifications states, “All materials being used are subject to inspection or tests at any time during preparation or use. Any material which has been tested and accepted at the source of supply may be subjected to a check test after delivery, and all materials which, when re-tested, do not meet the requirements of the specifications will be rejected.”

The method and location of sampling materials should be consistent and uniform. The AE can retest accepted materials if the material shows visible changes, does not conform to specifications, or if further testing is called for by the specifications or Guide Schedule. Construction Materials and Pavements (CST M&P) contains additional material specific information on sampling and testing responsibilities.