- Why PPE Is a Formal Exam Requirement, Not a Suggestion
- The Four Required PPE Items: Exactly What ACI Specifies
- Equipment You Must Operate by Domain
- What Performance Evaluators Are Actually Watching
- Written vs. Performance: Two Different Preparation Mindsets
- Day-of Gear Checklist for the Performance Exam
- Aligning Your Study Schedule to Equipment-Heavy Domains
- Frequently Asked Questions
- ACI requires safety-toe shoes, long pants, a sleeved shirt, and safety glasses - arriving without any one item can disqualify you.
- The performance exam covers six hands-on ASTM tests plus an oral description of C172 sampling; you must correctly complete all required steps to pass.
- Equipment is provided by the Sponsoring Group, but you must know each tool's purpose, calibration status indicators, and correct handling technique.
- There are no education or experience prerequisites - ACI explicitly states that certification is not training, so you must self-prepare before exam day.
Why PPE Is a Formal Exam Requirement, Not a Suggestion
The ACI Concrete Field Testing Technician Grade I performance exam takes place at a live concrete pour or a field-simulated testing site, managed by one of ACI's 135+ Sponsoring Groups - local chapters, concrete associations, state transportation agencies, and universities. Because you are working with freshly mixed hydraulic-cement concrete in a real field setting, the American Concrete Institute has codified specific personal protective equipment (PPE) as a hard requirement for exam admission.
This is not boilerplate language buried in the fine print. Sponsoring Group proctors are instructed to enforce PPE compliance before the performance component begins. Arriving without the correct gear can prevent you from sitting the exam entirely, forfeiting your registration fee - which, depending on your Sponsoring Group, can range from roughly $450 to more than $660. ACI SoCal, for instance, lists $610 for members and $660 for non-members. There is no provision for a partial refund because you forgot work boots.
Understanding why each item is required also helps you remember the list. Concrete is caustic; even brief skin exposure to fresh portland-cement paste can cause chemical burns. Safety-toe protection addresses the very real weight hazard of steel molds, tamping rods, and strike-off bars. Safety glasses guard against splatter when consolidating specimens or operating a pressure meter. None of this is theoretical - these are the same hazards that govern PPE on every DOT project, precast plant, or ready-mix delivery site where Grade I technicians work.
The Four Required PPE Items: Exactly What ACI Specifies
Safety-Toe Footwear
Steel-toe or composite-toe boots meeting ASTM F2413 are the standard. Sneakers, work boots without toe protection, and slip-on shoes are not acceptable. Your footwear must be closed-toe and provide lateral ankle support appropriate for an uneven field surface. Many candidates who sit exams administered by state DOT chapters discover that their evaluators are highway inspectors by profession - they notice footwear immediately.
Long Pants
Full-length trousers that cover the leg from waist to ankle are required. Shorts, capri-length pants, and cropped trousers do not qualify. Denim, canvas work pants, or similar durable fabrics are strongly preferred because they resist the abrasive and caustic nature of concrete paste. Thin athletic fabric offers little protection if you kneel beside a test cylinder or a slump cone on concrete substrate.
Sleeved Shirt
A shirt with at least short sleeves satisfies this requirement; long sleeves are better. The intent is to protect the forearm and upper arm from cement paste. Tank tops, sleeveless undershirts, and athletic cut-offs are not acceptable. If the exam occurs during warm months - and many Sponsoring Groups schedule performance exams in spring and summer - bring a lightweight long-sleeve option you can roll up between procedures.
Safety Glasses
ANSI Z87.1-rated safety glasses or goggles are standard. Prescription eyeglasses alone do not satisfy this requirement unless they are rated Z87.1 and include side shields. If you wear corrective lenses, plan ahead: either obtain Z87.1 prescription glasses with side shields, or bring Z87.1 goggles designed to fit over standard glasses. This is one of the most common oversights among first-time candidates.
Key Takeaway
Pack your PPE the night before your exam. Place safety glasses in your boot bag, not in a jacket pocket - they are the item most frequently forgotten on exam morning because they feel optional until a proctor stops you at the gate.
Equipment You Must Operate by Domain
Beyond PPE, the performance exam requires you to correctly handle and use the apparatus specified by each ASTM test method. The Sponsoring Group supplies the equipment - you do not need to bring concrete testing tools - but you are expected to arrive already familiar with each instrument. The following domain-by-domain breakdown covers what you will touch, read, and operate on exam day.
Domain 1: ASTM C1064/C1064M - Temperature
Thermometer calibrated per the standard, with the correct immersion depth and response time. You must demonstrate proper placement in the concrete sample and wait the full required period before reading.
- Thermometer must remain in contact with concrete (not air) for the specified duration
- Reading must be taken without removing the thermometer from the sample
- Know the acceptable temperature range for concrete placement conditions
Domain 2: ASTM C172/C172M - Sampling (Oral Description)
Uniquely, sampling is tested via oral description rather than hands-on demonstration, because sampling from a truck requires the full discharge. You must verbally walk through the correct procedure: where to sample from the discharge stream, how many increments to take, and composite sample preparation.
- Know the prohibited sampling points (first and last portions of the load)
- Describe the time limit from sampling to testing start
- Explain the composite sample minimum volume for the tests being performed
Domain 3: ASTM C143/C143M - Slump
Slump cone, tamping rod, and non-absorptive base plate. The sequence of filling (three layers, 25 rod strikes per layer) and the measurement technique - slump measured to the nearest 1/4 inch - are both evaluated.
- Foot placement on cone base lugs during filling
- Vertical rod penetration, not angled
- Clean lift of the cone without twisting or lateral displacement
Domain 4: ASTM C138/C138M - Density (Unit Weight) and Air Content (Gravimetric)
Calibrated balance or scale, unit weight measure (container of known volume), tamping rod or vibrator. This domain also tests your ability to calculate density, yield, and gravimetric air content using measured values.
- Correct filling and consolidation based on slump range (rodding vs. vibration thresholds)
- Strike-off technique to produce a flat surface flush with the container rim
- Density calculation: mass of concrete divided by volume of measure
Domain 5: ASTM C231/C231M - Air Content by Pressure Method (Type B Meter)
Type B pressure meter with calibrated gauge, aggregate correction factor pump, and water addition tube. This is the most equipment-intensive single procedure on the exam.
- Correct clamping and sealing of the meter lid
- Performing the aggregate correction factor test
- Reading the dial after releasing the main air valve - only one opportunity
Domain 6: ASTM C173/C173M - Air Content by Volumetric Method (Roll-A-Meter)
Volumetric air meter (roll-a-meter), isopropyl alcohol, and calibration equipment. Primarily used for lightweight aggregate or slag concretes where pressure method is inaccurate.
- Adding the correct volume of isopropyl alcohol without error
- Rolling and agitating technique to eliminate air bubbles
- Reading the graduated neck to the nearest 0.1%
Domain 7: ASTM C31/C31M - Making and Curing Field Specimens
Cylinder molds (4×8 or 6×12 inch), tamping rod, internal vibrator, mallet, and curing materials. Candidates must demonstrate correct consolidation, finishing, labeling, and initial curing procedures.
- Selecting correct mold size and consolidation method based on slump
- Finishing the top surface with minimal disturbance
- Initial curing temperature range and protection from vibration and evaporation
What Performance Evaluators Are Actually Watching
ACI performance evaluators are typically certified ACI Concrete Field Testing Technician Grade II personnel or higher, often employed by DOT agencies, testing labs, or inspection firms. They grade on a pass/fail basis: either you correctly performed all required steps for each procedure, or you did not. There is no partial credit, no curve, and no second attempt on exam day.
Evaluators watch for specific procedural errors that real-world field technicians make under time pressure. Common failure points include: lifting the slump cone with a lateral torque rather than a clean vertical pull; reading a pressure meter gauge before fully releasing the main air valve; using the incorrect number of rod strokes per layer in a cylinder mold; and forgetting to perform the aggregate correction factor before reading air content with the pressure meter.
Your PPE compliance is also part of the evaluator's initial checklist. Before any concrete is touched, the proctor visually confirms that all four PPE items are in place. Think of it as a job site pre-task safety check - because that is exactly what it models.
For additional context on who is eligible to sit this exam and whether you need prior field experience, see our article on ACI Exam Prerequisites: Who Can Take the Test 2026. The short answer: there are no formal prerequisites, but that makes the performance evaluation even more consequential - experience is not assumed or credited.
Written vs. Performance: Two Different Preparation Mindsets
The ACI Grade I exam is a two-part assessment, and the preparation logic for each part is fundamentally different. The written component - 55 multiple-choice questions in 60 minutes, closed book - tests your recall of tolerances, formulas, step sequences, and procedural rules across all seven ASTM domains. You need at least 60% in each of the seven individual ASTM sections and 70% overall to pass. Our ACI practice test tools are structured around those exact domain breakdowns, giving you section-by-section scoring so you can identify which ASTM methods need more written review.
| Component | Format | Passing Standard | Preparation Focus |
|---|---|---|---|
| Written Exam | 55 multiple-choice, 60 minutes, closed book | ≥60% per ASTM section AND ≥70% overall | Memorize tolerances, formulas, step sequences, ASTM language |
| Performance Exam | Hands-on 6 ASTM procedures + oral C172 description | Pass/fail on all required steps | Physical repetition with actual equipment; PPE compliance |
The performance exam cannot be conquered through reading alone. If you work at a ready-mix plant, a concrete lab, or a DOT inspection office, you likely already handle much of this equipment daily - that background is a major advantage. If you come from a background without regular field testing exposure, make arrangements to practice on actual equipment before exam day. Many Sponsoring Groups offer preparatory workshops specifically because ACI's own documentation notes that certification is not training.
Day-of Gear Checklist for the Performance Exam
Use the following checklist the night before your exam. Everything below the PPE line is supplied by your Sponsoring Group, but confirming you know what each item looks like and does is your responsibility.
- Safety-toe footwear - confirmed ASTM F2413 rated, closed-toe
- Long pants - full ankle-length, durable fabric
- Sleeved shirt - minimum short-sleeve; long-sleeve recommended
- Safety glasses - ANSI Z87.1 rated; if prescription lenses, verified side-shield or over-glass goggle
- Valid government-issued photo ID - required for identity verification at most Sponsoring Groups
- Simple calculator - four functions plus square root only; scientific or programmable calculators are not permitted
- Confirmation of exam time, location, and parking - Sponsoring Groups set all logistics independently
If you are a veteran, confirm before exam day whether you have submitted your $250 rebate application to the ACI Foundation. That paperwork is separate from your registration with the Sponsoring Group and must be completed independently. The exam fee itself is paid to the Sponsoring Group; the ACI Foundation rebate is a separate reimbursement channel. The exam is also GI Bill reimbursable, which your certifying VA education official can confirm.
Aligning Your Study Schedule to Equipment-Heavy Domains
Because the performance exam is pass/fail on correct procedural execution, your preparation time is better spent with progressive domain weighting than with uniform coverage. The written exam has 5-10 questions per ASTM method, which means some sections carry more written weight - but on the performance side, every domain is equally critical. A single failed procedure fails the performance component.
C172 Sampling + C1064 Temperature
- Read both ASTM procedures in CP-1, 41st Edition from cover to cover
- Write out the C172 oral description as if speaking to an evaluator - time yourself
- Identify the time limits, prohibited sampling locations, and thermometer immersion requirements
C143 Slump + C138 Density/Unit Weight
- These two procedures are performed sequentially in most field testing sequences - practice them together
- Work through the C138 density and yield calculation formulas until you can solve them in under two minutes with a basic calculator
- If equipment access is available, perform the slump test physically at least five times
C231 Pressure Meter + C173 Volumetric Meter
- These are the highest equipment-failure-risk procedures for candidates without lab backgrounds
- Memorize the aggregate correction factor procedure for C231 - evaluators specifically look for this step
- Understand when C173 is used instead of C231 (lightweight aggregate, slag) - the written exam tests this distinction
C31 Cylinder Making + Full Practice Run
- C31 has the most variables: mold size selection, consolidation method selection, curing requirements
- Simulate the full performance exam sequence from C172 oral description through C31 cylinder finishing
- Use ACI practice tests for timed written review across all seven domains before your exam date
For more detail on eligibility and what to expect from the registration process at your local Sponsoring Group, review our comprehensive breakdown at ACI Exam Prerequisites: Who Can Take the Test 2026. Understanding who administers the exam and how fees are set is essential context before you register - especially since there is no standardized national fee and no remote testing option.
Frequently Asked Questions
Yes. Sponsoring Group proctors enforce ACI's PPE requirements before the performance component begins. If you arrive without safety-toe shoes, long pants, a sleeved shirt, or safety glasses, you may be denied entry to the testing site. This would forfeit your exam registration fee, which varies by Sponsoring Group but typically falls between $450 and $660 or more.
Yes. Your Sponsoring Group supplies all required ASTM testing apparatus - thermometer, slump cone, unit weight measure, pressure meter, roll-a-meter, cylinder molds, tamping rod, and associated tools. You are responsible only for your PPE and your personal items such as a calculator and photo ID. However, you are expected to know how to use every piece of equipment without receiving instruction on-site.
No. ASTM C172 sampling is evaluated through an oral description rather than a live hands-on demonstration, because sampling from a ready-mix truck requires full truck discharge. You must verbally describe the correct procedure - including prohibited sampling points, the number of increments, composite sample preparation, and time limits from sampling to testing - while an evaluator assesses your accuracy.
ACI permits a simple calculator with only four basic functions plus square root: addition, subtraction, multiplication, division, and square root. Scientific calculators, programmable calculators, and smartphone calculator apps are not permitted. Both exam components are closed book, so the calculator is your only computational aid for density, yield, and air content calculations.
ACI Grade I certification is valid for five years from the date of issue. Recertification requires passing both the written exam and the performance exam again - there is no continuing education alternative. ACI also provides a one-year grace period after expiration during which you may recertify without losing your certification status entirely, though individual project specifications and employer requirements may not honor an expired credential during that window.
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