12.3 CP-1, JTA, and Source Control

ACI Concrete Field Testing Technician Grade I Study Guide Exam

Track your progress as you read

Finished sections get a check mark.

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

12.3 CP-1, JTA, and Source Control

Key Takeaways Explain This Topic AI

ACI CP-1 (Technician Workbook for ACI Certification of Concrete Field Testing Technician—Grade I) is the official training workbook and the source for procedure detail.

The exam is built from a Job Task Analysis (JTA) that defines the knowledge and skills a Grade I technician must demonstrate.

Always study the current edition of the ASTM standards, because rod-stroke counts, timing, and tolerances are occasionally revised.

The seven ASTM standards themselves are the authoritative source of every tested value; chapter and chapter notes in CP-1 explain how to apply them.

Last updated: June 2026

CP-1: The Official Workbook

ACI CP-1 , the Technician Workbook for ACI Certification of Concrete Field Testing Technician—Grade I , is the official training and reference document for this credential. It compiles the seven ASTM standards the exam covers and adds explanatory notes, equipment descriptions, and step-by-step procedure checklists that examiners use to grade the performance exam. Studying from CP-1 ensures you are learning the exact procedure ACI expects, in the exact sequence the performance exam grades.

CP-1 is not a substitute for the ASTM standards themselves — it is built around them. The standards are the authoritative source of every value the written exam tests: the 25 rod strokes, the 2.5-minute slump window, the 3-to-7-second cone removal, the temperature precision, and the curing temperatures. When CP-1 and your memory disagree, the current ASTM standard wins.

CP-1 also serves a second purpose: it is the examiner's grading reference for the performance exam. The checklists you study are essentially the same checklists the examiner uses to score you, step by step. Studying CP-1 therefore aligns your practice exactly with how you will be graded — there are no surprise procedures or hidden steps. If a step is in the CP-1 checklist, expect to be graded on it; if it is not, it will not appear. This makes CP-1 the single best document to drill against for both the written and the performance halves of the credential.

The Job Task Analysis (JTA)

ACI builds each certification exam from a Job Task Analysis (JTA) — a structured study of what the job actually requires. For Grade I, the JTA defines the knowledge and skills a technician needs to properly perform and record the results of seven basic field tests on freshly mixed concrete . Every written question and every performance task maps back to a JTA task statement, which is why the exam emphasizes recording and precision as heavily as physical technique.

Understanding the JTA framing changes how you study: the exam is not testing trivia about concrete chemistry; it is testing whether you can execute and document standardized field tests reliably. Focus your effort on the task : select the right equipment, follow the standard's steps in order, observe the time limits, and record the result to the correct precision and units.

What the JTA Covers for Grade I

• Domain JTA focus
• Sampling Obtaining a representative composite sample (C172)
• Workability Measuring slump correctly and reproducibly (C143)
• Air content Pressure (C231) and volumetric (C173) methods
• Density/yield Unit weight and yield calculations (C138)
• Temperature Measuring and reporting fresh-concrete temperature (C1064)
• Specimens Making and curing field cylinders (C31)

Each JTA domain breaks into specific task statements — for instance, under sampling: identify equipment, obtain portions from the required points in the load, combine into a composite, and begin testing within the time limit. Under density/yield: fill and consolidate the measure correctly, strike it off, weigh it, and calculate unit weight, yield, and relative yield. The written questions test the knowledge behind these tasks (why, when, and to what tolerance) while the performance exam tests the skill of executing them.

Studying with the JTA in mind keeps you focused on the procedures and decisions a working technician actually makes, which is exactly what both halves of the exam reward.

Source Control: Use the Current Edition

ASTM revises its standards on a rolling cycle, and values can change between editions . Designations carry a year suffix (for example, C143/C143M-XX). Cone-removal timing, rod-stroke counts, tolerances, and curing temperatures have all been refined over the years. Studying an outdated PDF found online is a common, avoidable cause of wrong answers.

Source-control habits that protect your score:

Train from the current CP-1 edition distributed by ACI for your session.

Cross-check any value you are unsure of against the latest ASTM standard , not a third-party summary.

Treat quizzes and cheat sheets as practice prompts, not as the source of truth.

When a chapter or sponsor handout conflicts with the standard, default to the standard.

This discipline matters beyond the exam: on the jobsite, acceptance testing is governed by the referenced edition in the project specification , and using the wrong edition can invalidate results.

Reading an ASTM Designation Correctly

Learning to read an ASTM designation prevents edition mistakes. A designation like C143/C143M-XX packs several pieces of information:

• Element Meaning
• C Cement and concrete subcommittee classification
• 143 The unique standard number for the slump test
• /C143M The companion metric (SI) version of the same standard
• XX The year of the current edition (re-approval or revision)
• a, b suffix A revision issued within the same calendar year

The /M designation matters in the field: dual-unit standards give both inch-pound and SI procedures, and the project may specify which system governs. The year suffix tells you the edition — when a specification cites a specific year, that frozen edition controls even if a newer one has been published. An ε (epsilon) symbol after the year indicates an editorial correction.

Understanding this structure stops you from being thrown by a designation with a year you have not seen — the number and the test it represents are what matter. It also builds the habit of checking which edition a specification cites before you test. The standard, in its correctly referenced edition, is always the final authority over any summary, handout, or memory.