ACI Concrete Field Testing Technician Grade I Practice Test
Free ACI Concrete Field Testing Technician—Grade I written exam practice in English, Chinese, and Spanish — temperature, sampling, slump, density and yield, pressure and volumetric air content, and making and curing cylinders, with an explanation for every answer.
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Practice questions built from the seven ASTM test methods and practices named in ACI's Concrete Field Testing Technician—Grade I program and its published Job-Task Analysis. This site is not affiliated with or endorsed by the American Concrete Institute or ASTM International, and these are not real exam questions. This bank covers the WRITTEN examination only — certification also requires a hands-on performance examination that no multiple-choice question can prepare you for. ASTM revises these methods on a regular cycle, so time limits, tolerances, layer and stroke counts, and equipment dimensions are deliberately not tested from memory here; work from the current editions your project and your sponsoring group specify, and confirm current requirements with ACI before testing.
About the ACI Concrete Field Testing Technician—Grade I exam
Concrete Field Testing Technician—Grade I is the American Concrete Institute's entry credential for the person who tests fresh concrete on the job: the technician at the truck chute or the pump line who takes the sample, measures its temperature, slump, density and air content, and makes the cylinders that will be broken weeks later to prove the structure's strength. Project specifications and agencies across the country call for these tests to be run by an ACI-certified technician, and ACI's own policy requires no specific education or work experience to earn it. Certification has two halves — a written exam and a hands-on performance exam — and this bank prepares you for the written one, with one topic for each of the seven ASTM methods the program names, in English, Chinese and Spanish.
How to study for the Grade I written exam
Start from the pass rule, because it changes how you should study. Every one of the seven methods is scored on its own and must clear 60 percent, so the exam punishes a single blind spot far more than a slightly low average. Take one topic at a time, find the method you are weakest on, and keep returning to it until it is as solid as the others. For most candidates that is one of the two air-content methods or the density and yield calculations, not slump.
Learn each method as a story with a beginning, a middle and an end. Sampling comes first and everything depends on it: a sample taken from the wrong part of the load, left in the sun or never remixed spoils every test that follows. Then each test has a reason for every step — why the cone is held down by its foot pieces, why the measure is struck off with a plate, why the petcocks are closed before the main air valve is opened, why alcohol goes into the roll-a-meter. If you can explain why a step exists, you will recognize the wrong order or the skipped step in a question even when the wording is new.
Practice the density and yield arithmetic until it is automatic, because it is the main place the exam asks you to compute under time pressure. Density is the mass of concrete in the measure divided by the measure's calibrated volume; yield is the total mass of everything batched divided by that density; relative yield compares the yield you measured to the yield the mix was designed for; and gravimetric air content compares the density you measured to the density the mix would have with no air at all. The common mistakes are mechanical — forgetting to subtract the empty measure, using the nominal volume instead of the calibrated one, or dividing the wrong way — and the explanations here name them so you learn to catch your own.
Finally, know what to do when something goes wrong, because the exam tests judgment as well as procedure. A slump that shears off, a volumetric bowl with concrete still stuck in it, a cylinder left in the sun on a hot afternoon, a sample that sat too long before testing — in each case the right answer is a specific action, usually to discard and retest a fresh portion, record what happened, or report the condition rather than adjust the number. Then put the book down and get your hands on the equipment: the written exam rewards understanding, but the performance exam rewards practice.
FAQ
Do I need experience or schooling before taking the Grade I exam?
No. ACI's certification policy for this program states that no specific education or work experience is required as a prerequisite. You register through one of ACI's sponsoring groups, which run the exam sessions and often offer an optional review course beforehand. That openness is why the credential is a common first step for laborers, finishers and new hires at testing labs, and it is also why preparation matters: nobody screens you before the exam, so the exam itself does the screening.
How is the written exam scored?
ACI describes the written exam as one hour, closed book, with 55 multiple-choice questions and between five and ten questions on each of the seven ASTM methods. The pass rule is the unusual part: you must score at least 60 percent on EACH method and at least 70 percent overall. A strong overall score does not rescue a weak method, so a candidate who knows slump and cylinders cold but has never run a volumetric air meter can still fail. That is why this bank is split into one topic per method — practice each until it stands on its own. Confirm the current format with ACI or your sponsoring group before you test.
Does this practice bank cover the performance exam?
No, and it is worth being clear about why. The performance exam asks you to actually run six of the methods in front of an examiner and to describe the sampling practice out loud, and you are judged on doing every required step in the right way. No multiple-choice question can prepare your hands for that. What this bank can do is make sure you understand why each step exists, what comes before what, and what a result means — which is exactly what the written exam tests and what makes the hands-on steps easier to remember. Pair it with supervised practice using real equipment.
Why don't these questions ask me to memorize time limits and tolerances?
Because those are the numbers ASTM changes when it revises a method, and a practice question that keys an old figure teaches you something wrong. The real written exam does expect you to know specific values from the current editions, so learn them from the standards and the study materials your sponsoring group uses. What this bank drills is the part that does not move: why a sample has to be remixed, why the slump cone is lifted straight up, why the pressure method is wrong for lightweight aggregate, what an undisturbed lump of concrete in the volumetric bowl means, and what you do when a result is out of bounds. When a scenario needs a number, the question gives it to you.
When do I use the pressure method instead of the volumetric method for air content?
The pressure method, ASTM C231, works by compressing the air in the sample, so it is meant for concrete made with relatively dense aggregates; porous aggregates such as lightweight aggregate or air-cooled slag let air into their own pores and make the reading unreliable. The volumetric method, ASTM C173, washes the air out of the concrete with water and reads it directly, so it works with any aggregate and is the method for lightweight concrete. It is slower and more physical — the meter has to be inverted, agitated and rolled until the reading stops changing — which is why most normal-weight work is tested with a pressure meter. Both pools here drill the choice from each side.
Recommended study resources
- ACI Concrete Field Testing Technician Grade I study guides on Amazon ↗
Print study guides pair well with free drilling — read the theory there, test yourself here.
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