Under what condition should a batch be rejected?

• A. If the batch ticket matches the order and materials.
• B. If admixtures are added but not documented.
• C. If the batch does not meet the mix design or water addition limits and corrective action cannot be achieved.
• D. If ambient temperature is low.

Answer: (C)

The key idea is that a batch is only acceptable if it can meet the approved mix design and the specified water addition limits. If the batch cannot be brought into compliance with those design requirements and there’s no way to correct it to meet the specifications, it must be rejected. The mix design sets the exact proportions and allowable water content to achieve the desired strength and workability; going beyond those limits changes the material’s performance and durability. When corrective actions aren’t able to bring the batch into spec, the safest and proper action is to reject to protect the integrity of the concrete placed.

Other points, like the batch ticket matching the order and materials, show paperwork consistency but don’t guarantee the batch’s performance. Admixtures added without documentation indicate a process issue that needs investigation, but rejection hinges on whether the mix still meets design and water limits. Ambient temperature being low by itself doesn’t automatically require rejection; curing and placement plans would be addressed separately as needed.