12.1 Two-to-Six Week Final Review Plan

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

12.1 Two-to-Six Week Final Review Plan

Key Takeaways Explain This Topic AI

The Grade I written exam has 55 closed-book multiple-choice questions in one hour, with 5-10 questions on each of the seven ASTM methods.

You must score at least 60% on EVERY individual test method AND 70% overall to pass the written exam.

The single highest-yield value per test (25 rod strokes, 2.5-minute slump limit, 3 to 7 seconds cone removal) anchors most questions.

Spend the most review time on C231/C173 air content and C138 unit weight/yield, which carry the heaviest calculation load.

Last updated: June 2026

How the Exam Scores You

The ACI Concrete Field Testing Technician—Grade I written examination is closed book , one hour long, and contains 55 multiple-choice questions . ACI distributes 5 to 10 questions on each of the seven ASTM methods and practices, so the question count is spread deliberately across all seven topics rather than concentrated in one or two. The scoring rule is what makes the exam unforgiving: you must earn at least 60% correct on each individual test method AND a minimum of 70% overall . Failing even one method below 60% fails the whole written exam, even if your overall average comfortably clears 70%.

This dual threshold drives the entire review strategy: you cannot skip a weak test . A candidate who is strong on slump and temperature but shaky on the volumetric air method can still fail the whole written exam on that single weak category. Your plan must therefore touch all seven methods every week, with extra time reserved for the calculation-heavy and detail-dense ones. Because there are only 55 questions, missing a handful in one narrow method can drop it below 60% quickly. Treat every method as mandatory and verify your readiness category by category, never by your overall average alone.

The Seven Methods and the Single Most-Tested Value

Memorize one anchor fact per standard first, then layer in the procedure detail. These anchors appear in the highest share of questions:

ASTM Test Single most-tested value

C172/C172M Sampling fresh concrete Composite sample within 15 minutes from first to last portion; test within time limits

C143/C143M Slump 25 rod strokes per layer , 3 layers; raise cone in 3 to 7 seconds ; complete in 2.5 minutes
C138/C138M Density (unit weight) & yield 3 equal layers, 25 strokes each ; tap sides 10-15 times per layer
C231/C231M Air content (pressure method) Type B meter; NOT for lightweight aggregate concrete
C173/C173M Air content (volumetric) Works for any aggregate including lightweight; uses isopropyl alcohol
C1064/C1064M Temperature Read to nearest 1 °F (0.5 °C) ; ≥ 3 in. (75 mm) cover around sensor
C31/C31M Making & curing field cylinders Standard initial cure 60-80 °F (16-27 °C) for up to 48 hours

These anchor values are the backbone of the highest-yield questions. The most common written-exam traps swap a value from one method into a question about another — for example, asking how many rod strokes a slump layer needs and offering an answer that actually belongs to a different mold size, or describing the volumetric method but listing the pressure meter as the apparatus. Knowing the single most-tested value cold for each test lets you reject those swapped distractors instantly.

A useful memory frame: three are timing/precision driven (C172 sampling, C143 slump, C1064 temperature), two are air content (C231 pressure vs. C173 volumetric, split mainly by aggregate type), and two are specimen handling (C138 unit weight/yield, C31 cylinders). Grouping them keeps the values from blurring together under exam pressure.

Week-by-Week Structure

Weeks 1-2 (foundation): Read each ASTM scope and significance statement, then build a one-page summary per method listing equipment, number of layers, rod strokes, tolerances, and timing. Do an untimed pass of every practice question so you know which methods are weakest.

Weeks 3-4 (drill the calculations): C138 (unit weight, yield, cement content, relative yield), C231/C173 (air percentage and aggregate-correction factor), and C143 (slump to the nearest 1/4 in.) carry the math. Work each calculation type until you can do it without notes. Re-test C172 sampling timing and C31 mold/curing rules because they hide easy points.

Weeks 5-6 (timed simulation): Take full 55-question, 60-minute closed-book mock exams. Track your per-method percentage, not just the total. Any method under 60% becomes your next study block. Also schedule your performance-exam rehearsals during this phase so both halves peak together.

High-Yield Recap of the Seven Tests

Going into the final weeks, you should be able to state these from memory: C172 — composite the sample and begin testing within the time limit (about 15 minutes for slump/air/temperature work). 5 minutes, report to the nearest 1/4 in. C138 — three layers, 25 strokes each, tap the sides 10-15 times per layer, then calculate unit weight, yield, and relative yield. C231 — pressure method, Type B meter, not for lightweight aggregate. C173 — volumetric method, works for any aggregate, uses isopropyl alcohol. C1064 — report temperature to the nearest 1 °F with at least 3 in. of concrete cover around the sensor.

C31 — make cylinders in the prescribed layers and provide standard initial curing at 60-80 °F for up to 48 hours. If any of these does not come instantly, that method goes to the top of your study list.

Daily Time Budget
40% on the two heaviest topics this week
30% rotating through the remaining methods so none goes stale
20% timed mixed quizzes
10% reviewing missed-question explanations

Compressing the plan: If you only have two weeks, fold Weeks 1-2 and 3-4 together — read the standards once, build your summaries, and move straight into daily calculation drills plus timed quizzes. The non-negotiable is the final timed simulation phase: you should sit at least two or three full closed-book mocks before exam day and use the per-method scores to direct your last study hours. The biggest avoidable failure is walking in with a strong overall practice average but one method still hovering near 60%.