Study guide
11.1 Performance Exam Map and Mindset
ACI Concrete Field Testing Technician Grade I Study Guide Exam
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1 Orientation: Certification Requirements, Written Exam, Performance Exam, and Study Sources
1.1 Credential Purpose and Official Definition 1.2 Eligibility and the Two-Part Certification Path 1.3 Written Exam Format and Dual Passing Rule 1.4 Performance Exam Format and Grading 1.5 Current Study Sources and CP-1 41st Edition 1.6 Validity, Recertification, and Myth Control
2 JTA, Performance Checklists, Common Fail Points, and Field Mindset
2.1 JTA as the Exam Blueprint 2.2 Written Knowledge Versus Performance Skill 2.3 Performance Checklists and the Six Demonstrations 2.4 Timing, Sequence, and Verbal Description Discipline 2.5 Common Fail Points and Result Recording 2.6 Field Mindset, Exam Habits, and Second Trials
3 ASTM C172: Sampling Fresh Concrete and Field Sample Control
3.1 Representative Sampling Purpose and Exam Role 3.2 Sampling Locations and Middle-Discharge Control 3.3 Composite Sample Timing, Remixing, and Protection 3.4 Sample Size, Large Aggregate, and Wet Sieving 3.5 Sequence With Slump, Temperature, Air, Density, and Specimens 3.6 Performance Exam Verbal Description and Field Habits
4 ASTM C1064 Temperature and ASTM C143 Slump
4.1 ASTM C1064 Purpose, Equipment, and Timing 4.2 Sensor Placement, Stabilization, and Reporting 4.3 Temperature Field Errors and Performance Habits 4.4 ASTM C143 Scope, Equipment, and Setup 4.5 Filling, Rodding, Lifting, and Measuring Slump 4.6 Invalid Slump Results, Reporting, and Integrated Habits
5 ASTM C138: Density, Unit Weight, Yield, and Gravimetric Air
5.1 Purpose, Equipment, and the Calibrated Measure 5.2 Sampling, Filling, and Consolidation Choice 5.3 Strike-Off, Cleaning, Mass, and Density 5.4 Yield, Relative Yield, and Batch Comparison 5.5 Gravimetric Air and Theoretical Density 5.6 Reporting, Validity, and Calculation Traps
6 ASTM C231: Pressure Air Method, Type B Meter, and Aggregate Correction
6.1 Scope, Principle, and When Pressure Air Fits 6.2 Type B Meter Equipment, Calibration, and Setup 6.3 Sampling, Bowl Filling, Consolidation, and Strike-Off 6.4 Type B Sequence: Water, Petcocks, Pressure, and Reading 6.5 Aggregate Correction Factor and Final Air Content 6.6 Reporting, Validity, and Invalid-Result Traps
7 ASTM C173: Volumetric Air Method, Rollameter, Alcohol Correction, and Validity
7.1 Scope, Equipment, and When the Volumetric Method Fits 7.2 Sample, Bowl Filling, Consolidation, and Strike-Off 7.3 Water, Alcohol, Initial Liquid Level, and Sealing 7.4 Inversion, Shaking, Rolling, and Air Release 7.5 Reading Agreement, Out-of-Range Steps, and Invalid Results 7.6 Alcohol Correction, Calculation, Reporting, and Performance Habits
8 ASTM C31: Making and Curing Cylinders and Beams, Initial Curing, and Transport
8.1 Purpose, Sample, Equipment, and Specimen Plan 8.2 Cylinder Molding, Consolidation, Finishing, and Identification 8.3 Beam Molding, Flexural Specimens, and Finishing 8.4 Initial Curing, Protection, Temperature, and Moisture 8.5 Standard Curing, Field Curing, Final Curing, and Interpretation 8.6 Transport, Lab Handoff, Reporting, and Common Failures
9 Integrated Field Workflow: Test Order, Documentation, and Quality Control
9.1 Field Sample to Report Workflow 9.2 Test Order and Parallel Timing 9.3 Documentation and Report Accuracy 9.4 Invalid Results and Retest Decisions 9.5 QA/QC Communication and Acceptance Context 9.6 Contamination, Delays, and Handoff Control
10 Written Exam Strategy: Numerical Values, Calculations, and Category Scoring
10.1 One-Hour Written Exam Pacing 10.2 Category Scoring and the No-Compensation Rule 10.3 High-Yield Numerical Values and Units 10.4 Density, Yield, and Gravimetric Air Calculations 10.5 Air Content Corrections and Validity Checks 10.6 Method-by-Method Practice Plan
11 Performance Exam Strategy: Equipment Setup, Examiner Communication, and Remediation
11.1 Performance Exam Map and Mindset 11.2 Equipment Setup, Station Control, and Safety 11.3 Examiner Communication and Speaking the Work 11.4 One-Step Errors, Timing, and Method Control 11.5 C172 Verbal Description Under Pressure 11.6 Remediation, Retest Planning, and Field Confidence
12 Final Review: Recertification, Career Paths, and Next ACI Credentials
12.1 Two-to-Six Week Final Review Plan 12.2 Final Week and Test-Day Checklist 12.3 CP-1, JTA, and Source Control 12.4 Recertification, Five-Year Cycle, and Re-Exam Requirement 12.5 Career Paths After Field Testing Grade I 12.6 Next ACI Credentials and Growth Map
11.1 Performance Exam Map and Mindset
Key Takeaways Explain This Topic AI
The ACI Field Testing Grade I performance exam is closed book and requires live demonstration of six ASTM methods (C1064, C143, C138, C231, C173, C31) plus a verbal description of C172 sampling.
Each procedure is scored against a standardized step-by-step checklist, and you must pass every procedure — failing even one station fails the entire performance exam.
Certification requires both a passing written score (60% per method, 70% overall) and successful completion of the performance exam; one does not substitute for the other.
Some checklist steps are flagged critical/mandatory, so a single missed required action can fail a station even when the rest of the demonstration is competent.
Last updated: June 2026
A Checklist-Scored Demonstration, Not a Conversation
The American Concrete Institute (ACI) Concrete Field Testing Technician—Grade I credential has two parts: a written exam and a performance exam. Both must be passed before ACI grants certification, and a strong written score does not offset a performance failure. The performance exam is closed book , and it is structured as a series of stations where you physically demonstrate test methods to a certified ACI examiner while that examiner scores your technique against a standardized checklist.
The single most important fact about this exam is how it is graded. The examiner is not assigning a percentage or a holistic impression. For each procedure, the examiner works through a printed checklist of required steps and marks whether each one was performed (or, for C172, described) correctly. You must pass every procedure — failing even one test method means failing the entire performance exam. There is no averaging across stations, so a single weak test cannot be rescued by strong work elsewhere.
Six Hands-On Tests Plus One Verbal Description
The blueprint covers seven ASTM standards, but they are not handled identically on the performance exam. You physically demonstrate six methods and give a verbal description of the seventh (sampling). Do not train as if all seven are hands-on stations.
- ASTM standard Title Performance format
- C172/C172M Sampling Freshly Mixed Concrete Verbal description
- C1064/C1064M Temperature of Freshly Mixed Concrete Hands-on demonstration
- C143/C143M Slump of Hydraulic-Cement Concrete Hands-on demonstration
- C138/C138M Density (Unit Weight), Yield, Air (Gravimetric) Hands-on demonstration
- C231/C231M Air Content by the Pressure Method Hands-on demonstration
- C173/C173M Air Content by the Volumetric Method Hands-on demonstration
- C31/C31M Making and Curing Specimens in the Field Hands-on demonstration
C172 is verbal because casting a live composite sample on demand is impractical in an exam setting, but sampling is still scored and is still the foundation that every other test depends on. A vague C172 answer can fail you as surely as a fumbled slump.
Build the Mindset Around Observable, Mandatory Steps
Because grading is binary per step, your mindset should be to make every required action visible and unambiguous . If you place a sensor, rod a layer, strike off, tap the sides, read a gauge, or record a result, do it deliberately enough that the examiner can mark the corresponding checklist line. Many failures are not from ignorance of the test — they come from a single missed action, a broken sequence, or a step performed silently so the examiner could not confirm it.
Some checklist steps are flagged critical or mandatory . These are the steps the standard treats as essential to a valid result — for example, the number of rodding strokes, the consolidation method, or the timing window. Missing a critical step is weighted more heavily than a minor presentation flaw, so identify the must-do actions in each method and never skip them.
A few mindset rules that consistently help:
Slow enough to be accurate, fast enough to respect time limits — some steps (like slump within 5 minutes of the final sample portion) are time-bound.
Narrate the steps the examiner cannot see — a stabilized reading or an invalid-test recognition is invisible unless you say it.
End every station by stating the result you would record — recording is part of the procedure, not an afterthought.
Treat the checklist as a script during practice, never as something you can read during the exam — it is closed book.
Physical Practice Beats Reading
The best preparation is physical repetition with the same kinds of apparatus you will see: slump cone, base plate, 5/8 in. tamping rod, strike-off bar and plate, a temperature device, the unit-weight measure and scale, the Type B pressure meter, the roll-a-meter (volumetric) bowl and funnel, cylinder molds, scoop, and mallet. Reading CP-1 or watching demonstration videos builds recognition, but recognition collapses under nerves, time pressure, and an examiner's silent observation. Run each station start to finish — setup, sampling logic, consolidation, finishing, reading, and recording — until the sequence is muscle memory.
A practical way to budget your practice is to remember that the performance exam typically allows on the order of 10 to 20 minutes per procedure , and the examiner is watching for the correct sequence, the correct tolerances, and proper cleanup and documentation. Rehearse to that pace: not so slow that you run long, and not so fast that you skip a required check. The technician who looks unhurried on exam day is usually the one who practiced each station dozens of times until the rhythm became automatic.
How the Performance Exam Fits the Whole Credential
It helps to see the two exams as one credential with two gates. The written exam is a one-hour, closed-book, 55-question multiple-choice test, with five to ten questions on each of the seven ASTM standards. To pass it you need at least 60% on each individual method and at least 70% overall , so a single weak topic can sink the written exam even with a high total — the same all-or-nothing logic that governs the performance stations. The performance exam then confirms that you can actually do the work, not just recognize correct answers.
This structure exists because field testing has consequences. The numbers a Grade I technician records — slump, air content, temperature, density, and the cylinders cast for strength — feed acceptance decisions on real structures. ACI cannot certify someone who would record an unrepresentative or improperly measured value, so the performance exam deliberately checks the small, easily skipped steps that separate a defensible test from a meaningless one. Going in with that perspective keeps you from treating any station as a formality.