What is the purpose of chain-of-custody for concrete specimens?

• A. To ensure samples are kept in a clean area only.
• B. To guarantee the accuracy of slump measurements.
• C. To ensure traceability of samples from pour to test results; label and log each specimen.
• D. To speed up the testing process.

Answer: (C)

Chain-of-custody for concrete specimens is about traceability from the moment a sample is created at the pour to the final test results. By assigning a unique identifier to each specimen, recording the mix design, batch, placement, time, and curing conditions, and logging every transfer or person who handles the sample, you can reliably show that the test results come from the exact material and sample that was produced and placed. This keeps the process accountable, prevents mix-ups or substitutions, and supports the integrity of the testing data.

Keeping samples in a clean area is good practice, but it doesn’t address the tracking and accountability that chain-of-custody provides. Slump measurement accuracy isn’t determined by custody records, and while proper handling can improve reliability, the main purpose here is ensuring traceability and integrity of the sample through to the test results.