1.3 Written Exam Format and Dual Passing Rule

The Written Exam Is Timed and Closed Book

The ACI written examination for Concrete Field Testing Technician Grade I is closed book, one hour, and has 55 multiple-choice questions. ACI states that there are between five and ten questions on each required ASTM test method or practice. Because there are seven standards, the questions are spread across all of them rather than concentrated in one favorite area.

That distribution rewards balanced preparation. A candidate who is excellent at slump (C143) but ignored the volumetric air method (C173) still faces five to ten C173 questions. There is no way to dodge a standard; every one of the seven contributes a block of questions to the 55-question total.

With 55 questions in 60 minutes, a candidate has roughly 65 seconds per question. That is comfortable for recall questions and tight for multi-step calculations such as yield or gravimetric air, so pacing matters.

The Dual Passing Rule

Passing the written exam requires meeting two conditions at the same time:

1. At least 60% correct on each required test method or practice, and
2. A minimum of 70% correct overall.

This is the single most misunderstood feature of the written exam. A candidate can score well above 70% overall and still fail because one method category dropped below 60%. ACI does not let a strong category compensate for a weak one — the 60% floor is applied per method.

A Worked Example

Suppose a category has eight questions. Sixty percent of eight is 4.8, so the candidate must answer at least 5 of 8 correctly to clear the floor in that category. Now imagine a candidate answers 42 of 55 overall — about 76%, well past the 70% overall bar — but gets only 3 of 8 right on C231 pressure air (37.5%). That candidate fails, because the per-method floor was missed even though the overall score looked safe.

The practical lesson is to bring every standard up to a safe margin. Leaving one method weak is the most common way strong candidates lose the written exam.

Strategy for the Format

Because the floor is per-method, study time should be allocated to your weakest standard, not your favorite. Most candidates naturally over-study slump and temperature (which feel easy) and under-study the two air methods and the gravimetric-air calculation in C138. Reversing that instinct protects the 60% floor.

Pacing the Hour

• Answer every recall question first; do not stall on a calculation.
• Flag calculation-heavy items (yield, relative yield, gravimetric air, aggregate correction factor) and return to them.
• Guess on anything left blank at the end — there is no penalty beyond a wrong answer, and a blank cannot earn the per-method points you may need.

Because the exam is closed book, the numeric values that the calculations require — rod diameters, layer and rodding counts, tolerances, and timing limits — must already be in memory. Walking in with those numbers automatic frees the hour for thinking, not recalling.

Mapping Study Effort to the Question Blocks

The five-to-ten-questions-per-standard structure lets a candidate estimate where points come from. Across seven standards at the midpoint, the 55 questions are roughly balanced, but the standards differ in how much they can be tested.

• Sampling (C172) and temperature (C1064) are short procedures with fewer distinct facts, so their question blocks tend toward the lower end.
• Density/yield/gravimetric air (C138), the two air methods (C231 and C173), and specimen making (C31) are richer procedures with calculations, calibration steps, and validity rules, so they support more questions and more calculation items.

That means the calculation-heavy standards carry both the most question potential and the most time risk. A candidate who can compute yield, relative yield, gravimetric air, and the aggregate correction factor quickly protects both the overall score and the per-method floors in those categories.

A Realistic Failure Pattern

The classic written-exam failure is not low overall knowledge — it is a single neglected standard. A candidate breezes through slump, temperature, and sampling, banks a strong overall total, then runs out of time or knowledge on the volumetric air method and drops below 60% there. The dual rule turns that one gap into a failed exam. Guarding against it means walking in with no category sitting near the 60% line. Practicing a full 55-question mock under the one-hour clock is the most reliable way to expose which standard is the weak link before exam day, when it can still be fixed.

Reading the Questions Carefully

Multiple-choice items on this exam often hinge on a single precise value or condition: a layer count, a rod size, a tolerance, or a timing limit. Distractor answers are usually plausible numbers from a neighboring standard — the slump rod size offered as the air-meter tamping-rod size, or one method's rodding count offered for another. " Reading each question for which standard it is actually asking about, before scanning the options, prevents importing the right number from the wrong test.