In what scenario might a retest or replacement load be requested?

• A. If the load exceeds the truck's rated capacity, retest is required.
• B. If slump fails to meet project spec, a retest or replacement may be requested.
• C. If the batch has a perfect specification, retest is mandatory.
• D. If the plant wants to charge extra, retest is performed.

Answer: (B)

The need for a retest or replacement load arises when the test results show noncompliance with the project specifications, especially for slump. Slump measures how workable the concrete is, and if it falls outside the allowed range, the batch isn’t acceptable as is. A retest helps confirm whether the deviation is a sampling or testing anomaly, and if the slump remains out of spec, a replacement load is often requested to ensure the concrete going to the job meets the required properties. The other options don’t reflect a quality-control action tied to meeting project specs: exceeding truck capacity is a handling/weight issue, a batch with a perfect specification wouldn’t require retesting, and a plant wanting to charge extra isn’t a quality-control trigger.