The slump tolerance range is determined from which source?

• A. Batch ticket
• B. Batch plant specification
• C. Discharge of the mixer
• D. Field test results

Answer: (C)

Slump tolerance range is tied to the slump observed as the concrete is discharged from the mixer. The workability you actually place depends on what the mix does at discharge, so the field control band is defined by that discharge slump measurement. The batch ticket or batch plant spec set the target slump, but the allowable variation used in practice comes from the slump measured at discharge. Field test results are the data you collect to monitor performance, but they’re used to verify that the observed discharge slump stays within the specified range, not to establish the range itself. If the discharge slump falls outside the tolerance, adjustments are made at the plant to bring it back into range before placement.