Concrete
Concrete slump test checklist
What to check before accepting, adjusting, or rejecting a concrete truck on site.
Slump TestACI 117Truck AcceptanceConcrete
Direct answer
A slump result should be judged with the mix design, project tolerance, sampling method, timing, and any water-added decision. Do not accept or reject a truck from a number alone without the required context.
Before the test
- Confirm mix ID, ticket time, design slump, and tolerance.
- Confirm sampling location and elapsed time.
- Confirm whether water or admixture has been added on site.
- Check that the cone, rod, base, and technique are clean and consistent.
What to document
Record ticket number, mix, truck, batch time, sample time, measured slump, temperature, air if tested, water added, retest result, who approved the decision, and photos if disputed.
Common mistakes
- Testing after uncontrolled water addition without noting it.
- Rejecting a truck without checking tolerance and retest rules.
- Missing batch time and sample time.
FAQ
Can a truck be rejected only because of slump?
A slump result can support rejection, but the decision should follow project documents, test method, tolerance, elapsed time, and any allowed adjustment or retest process.