2.3 Performance Checklists and the Six Demonstrations

The Checklist Is the Performance Standard

The performance examination is built around required steps. ACI describes the format as actual demonstration of six required test methods and practices plus a verbal description of C172/C172M sampling. ACI policy states that performance is evaluated based on the criteria of the performance examination checklist, and the examinee is judged on the ability to correctly perform, or describe where allowed, all of the required steps for each procedure.

The word all is doing heavy lifting. The examiner is not grading your overall impression or your confidence. The examiner has a checklist for each method and is marking whether each listed step was performed correctly and in the right order. A measurement that is technically accurate but skips a required consolidation or leveling step is still a checklist miss. This is why candidates who only rehearse the headline action, like reading the slump or the air dial, are exposed: the checklist scores the unglamorous steps too.

What the Six Demonstrations Cover

The six demonstrated methods are everything except the verbally described sampling practice. Each carries its own checklist, and knowing the signature required steps prevents the most common omissions.

Consolidation method is set by slump: concrete with slump of 1 in. or more is rodded, while concrete below that slump is vibrated. The checklist expects the correct consolidation choice, not a default.

Rehearse Whole Procedures, Including Recording

Because the checklist scores every required step, the safest preparation is to practice each method as a complete unit: gather and identify equipment, consolidate properly, strike off and clean the rim, take the measurement, and record the result. ACI policy treats recording the result at the conclusion of each performed method as part of the procedure, so a perfect measurement that is never written down can still cost the step.

A Practice Loop That Mirrors the Checklist

1. Lay out and name every tool before starting, the way you would for the examiner.
2. Perform the consolidation and finishing steps deliberately, narrating each one.
3. Take and state the measurement to the correct precision.
4. Record the result immediately, in writing.
5. Reset and repeat until the full sequence is automatic.

Train the boring steps as hard as the dramatic ones. The examiner's checklist makes no distinction between reading a slump and tapping the mold the required number of times; both are required, and either can fail the trial if omitted.

How One Composite Sample Feeds the Demonstrations

A crucial efficiency the checklist assumes is that several tests come from one properly obtained composite sample. After remixing the sample with a shovel, you typically draw the material for slump, air, temperature, and cylinders from it in a planned order. Understanding this flow keeps you from re-sampling unnecessarily and helps you respect the shared 5-minute start window for slump, air, and temperature.

Typical Order Off One Sample

1. Temperature (C1064) can be taken from the sample with the sensor properly immersed.
2. Slump (C143) next, because it is quick and time-sensitive.
3. Air content (C231 or C173) depending on aggregate type.
4. Density and yield (C138) using the same measure family of equipment.
5. Cylinders (C31) molded as soon as practicable so curing begins promptly.

This ordering is a guide, not a rigid rule, but rehearsing a consistent flow reduces decision-making under observation. The examiner is not looking for a particular creative sequence; the examiner is confirming that each individual method's required steps are correctly performed and that time-sensitive tests begin inside their windows. A candidate who has internalized one clean flow off a single sample makes fewer timing errors than one who improvises the order while the clock runs.

Keep equipment for each method staged and clean. A wet, dirty measure or an unzeroed air meter introduces avoidable error and burns time, both of which the checklist quietly punishes through downstream step failures.

Finally, do not assume the six demonstrated methods are fixed in advance for every candidate. The principle to prepare for is that any of the six physically demonstrated methods may be on your station, plus the verbal C172 description, so you cannot skip a method hoping it will not appear. Treat all seven standards as in scope and rehearse each to the same standard. Walking in able to perform any of them cold is the only safe assumption, and it removes the gamble of guessing which methods the examiner will assign.