CTCI Passing Score 2026: Exactly What You Need to Pass

What "Passing" Actually Means for the Concrete Transportation Construction Inspector

Candidates searching for the Concrete Transportation Construction Inspector passing score usually expect a single number tied to a single test. The credential doesn't work that way. The American Concrete Institute (ACI) certifies inspectors through a pair of written examinations, and each one carries its own pass line. There is no blended score, no averaging, and no scaled-score mystery to decode. The rule is straightforward: at least 70% on each examination, taken separately.

That simplicity is deceptive. A 70% threshold on each of two tests means a strong performance on one cannot rescue a weak performance on the other. A candidate who scores 95% on the inspection exam and 65% on plans reading has not passed the program; they have passed one component and must clear the other within the allowed window.

Two Exams, Two 70% Thresholds

The program is built from two distinct written examinations, administered by ACI-approved examiners and proctors through sponsoring groups and ACI resource centers:

Note the word "approximately." These are approximate component counts, not an exact combined 100-question specification. Do not plan around a single 100-question sitting or a combined percentage. Plan around two separate hurdles, each judged on its own.

What 70% looks like in practice

Because the question counts are approximate, you should avoid memorizing a precise "number of misses allowed." As a planning heuristic, treat the plans-reading exam as the less forgiving of the two: with roughly 20 questions, each miss moves your percentage far more than a miss on an 80-question exam does. That asymmetry is exactly why candidates who coast through the inspection material sometimes stumble on the shorter test.

Question Counts and What They Imply

The inspection exam draws on a broad reference library. According to ACI's Job Task Analysis, the scope is expressed as a set of reference and knowledge-section headings plus a plans-reading section, 22 in all. Those 22 lines are source headings, not 22 percentage-weighted domains, so there is no official "Domain 12 is worth X%" breakdown to lean on. If you are working through the full list, our complete guide to all 22 CTCI content areas walks each one in detail.

What the question count does tell you: with roughly 80 questions spread across a wide body of documents, no single reference dominates. The exam rewards candidates who can field a question about hot-weather concreting, pumping, formwork, piles, and pavement within the same sitting.

The One-Year Window Between Exams

This is the rule that quietly ends more certification attempts than the 70% line itself. Both examinations must be passed within one year of each other. If you pass one and let the other lapse past that window, the program requires you to retake both. Passing once does not bank a result indefinitely.

The practical implications:

• Sequence deliberately. Many candidates take the inspection exam first because it is the heavier lift, then schedule plans reading while the material is fresh.
• Do not park a pass. If you clear the shorter plans-reading exam early, the clock on the inspection exam starts running.
• Track your dates. Retesting arrangements run through your sponsoring group, so confirm availability well before the year closes. Our CTCI exam dates and scheduling guide covers how to find and plan around testing events.

Open Book Does Not Mean Easy

Both exams permit authorized references. That changes how you prepare, but it does not lower the 70% bar. Open-book exams punish disorganization: if you must hunt for every answer, three hours across roughly 80 questions disappears quickly, and one hour for roughly 20 plans-reading questions is tighter than it sounds when you are interpreting drawings.

How to use references without losing time

• Know where things live. Tab and annotate your authorized materials so you can locate a cold-weather temperature provision or a tolerance requirement in seconds.
• Answer the sure ones first. Questions you know cold should cost you almost no reference time, banking minutes for the harder ones.
• Practice with the actual package. The standalone ACI CP-31 Transportation Inspector Reference Package is priced at $377 for ACI members and $628 regular, and some local providers bundle it with exam fees.

Where the Points Come From: The 22 Content Areas

Since no official percentage weighting is published for the 22 source headings, the smartest approach is coverage plus targeted depth. Here is how to think about the list in clusters.

One detail worth knowing: the JTA reference table lists ACI 347R while its body heading uses ACI 347. Don't let that discrepancy trip you up when matching your reference copy to the exam outline; the content area is formwork for concrete either way.

Gates Beyond the Score: Eligibility and Field Testing

Reaching 70% twice is necessary but not sufficient. ACI also requires you to satisfy eligibility and a field-testing prerequisite. For a full walkthrough, see our guide to CTCI requirements and eligibility. In brief:

• Experience pathways (any one): two years of college or technical school with at least 60 credit hours plus two years of relevant work; a high-school diploma or equivalent plus three years of relevant work; or five years of relevant work.
• What the experience must show: employer-verified work involving inspection decision-making, compliance evaluation, and documentation and reporting.
• Field testing condition: a current ACI Concrete Field Testing Technician, Grade I certification, or prior holding of it plus passing its current written exam within one year of the first Inspector exam passed.
• In-Training recognition: if the examinations and field-testing condition are satisfied but experience is still incomplete, the current program offers In-Training recognition rather than full certification.

Retakes, Fees, and Scheduling Mechanics

Fees are set locally, not nationally, so treat any figure as an example of how a provider packages the exams. Retesting is arranged through your sponsoring group.

These are local provider packages, not a national tariff. A single-exam price matters most for retakes: if you pass one exam and miss the other, a per-exam fee is far cheaper than repurchasing a bundle. For a fuller picture of what to budget, see the CTCI certification cost breakdown.

After you pass

Certification lasts five years. Recertification requires passing both Inspector examinations again and meeting the field-testing condition, so the 70%-twice standard applies at renewal as well as at initial certification. Weighing that recurring commitment against career upside is the subject of our ROI analysis and salary guide.

A Domain-Based Plan to Clear 70% Twice

Because two exams carry separate thresholds, schedule your preparation to protect both. This sequencing is tied to the content areas rather than generic study habits.

Put plans reading late in the schedule but give it its own block, not leftovers. A shorter exam amplifies each missed question. For a broader preparation framework, our CTCI study guide and one-page cheat sheet pair well with timed question drills, and you can rehearse the question style on the CTCI Exam Prep practice test site.

Frequently Asked Questions