If the slump is too high for the intended placement, what corrective steps might be taken?

• A. Use a retest or replacement load only.
• B. Reorder the batch to correct slump during transit.
• C. Adjust the mix within permit allowances, or reject/untangle and request a retest or replacement load per spec.
• D. Do nothing and proceed.

Answer: (C)

When the slump is too high, the mix is more flowable than required, which can lead to segregation and finishability issues. The appropriate action is to bring the batch into the specified range by adjustments that are permitted by the project’s specifications. This means modifying the mix within permit allowances—such as adjusting water content or admixture dosages, or adding cementitious materials as approved—so the workability meets the design. If those adjustments can’t bring the slump into spec, you should reject or untangle the current load and request a retest or a replacement load per the specification. This ensures the concrete will perform as intended in placement and curing. Reordering the batch or doing nothing would not address the nonconforming slump and could lead to placement problems.