What is the recommended action when a truck mixer is not rotating adequately during transit?

• A. Stop loading, notify the producer/driver, inspect for mechanical issues, and ensure the concrete still conforms to spec or discontinue delivery
• B. Continue loading and monitor
• C. Stop loading and discard the batch without notification
• D. Notify the driver and keep loading if necessary

Answer: (A)

When a truck mixer isn’t rotating adequately, the top priority is to stop loading and address the problem before adding more material. Notify the producer and driver right away so they can inspect for mechanical issues with the drum drive, bearings, or motor and determine whether the mixer can be fixed quickly. Then verify whether the concrete already in the drum still conforms to spec; if it doesn’t, discontinue delivery to prevent sending nonconforming material. The reason is that proper mixing is essential for uniform paste, correct aggregate distribution, and the intended strength and durability of the concrete. Continuing to load or deliver under these conditions risks producing unusable concrete and creating safety and quality issues.