Free ACI Aggregate Level 1 Exam Prep
ACI Aggregate Testing Technician Level 1
Prepare for the ACI Aggregate Level 1 exam without spending hundreds on expensive prep courses. Free study guides, practice questions, flashcards, and related exam resources.
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Aggregate Fundamentals and TerminologyYou are here
Learn the four moisture states (oven-dry, air-dry, SSD, moist), nominal maximum aggregate size, sieve nomenclature (No. 4 = 4.75 mm, No. 200 = 75 μm), and ASTM C33 basic requirements for fine and coarse aggregate used in concrete.
Sampling and Sample Reduction (D75 + C702)
Master field sampling techniques from stockpiles, conveyors, and transportation units per ASTM D75, then sample reduction by mechanical splitter (Method A), quartering (Method B), and miniature stockpile (Method C) per ASTM C702.
Sieve Analysis and Fineness Modulus (C136 + C117)
Learn gradation procedures, sieve series for fine and coarse aggregate, fineness modulus calculation, the 0.3% mass-check tolerance, and the washing method for materials finer than No. 200 (ASTM C117).
Specific Gravity and Absorption (C127 + C128)
Study the coarse aggregate wire basket method (C127) and the fine aggregate pycnometer/cone method (C128). Memorize bulk, bulk SSD, and apparent relative density formulas plus absorption calculations.
Moisture Content and Organic Impurities (C566 + C40)
Learn total evaporable moisture by drying and how to compute free surface moisture for batch water adjustment. Study the ASTM C40 sodium hydroxide color test for organic impurities with 24-hour standing time and Gardner color comparison.
Performance Exam Hands-On Practice
Practice each ASTM procedure hands-on until you can perform all steps without reference to notes. Use CP-44 performance checklists. Time yourself and focus on areas where the examiner will watch for technique errors.
Full Practice Exam and Review
Take timed full-length practice tests covering all 8 ASTM/AASHTO standards. Review weak areas and re-read any standard where you score below 70%. Tab your CP-44 workbook for efficient open-book navigation.
Can You Take the ACI Aggregate Level 1 Exam?
Check if you meet the basic eligibility requirements
- •Candidates must register through an ACI-approved sponsoring group or local ACI chapter
- •ACI CP-44 Technician Workbook is the official study reference
- •Open-book written exam — ASTM/AASHTO standards and CP-44 workbook may be used
- •Closed-book performance exam — procedures must be demonstrated from memory
- •Valid government-issued photo ID required at the testing session
ACI Aggregate Level 1 Quick Facts
Time to Get Licensed
4-10 weeks typical
From start to license in hand
Retake Policy
Candidates who fail the written or performance exam may retake the failed portion. Chapter policies vary on wait periods and fees; contact your local ACI chapter for specifics.
Total Cost Breakdown
Free ACI Aggregate Level 1 Prep Tools
108+ Practice Questions
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What You'll Study
7 chapters covering the exam topics in this guide
Chapter 1: Certification Overview & Aggregate Fundamentals
3 sections
Chapter 2: Sampling and Sample Reduction (ASTM D75 & ASTM C702)
3 sections
Chapter 3: Washing Test & Organic Impurities (ASTM C117 & ASTM C40)
3 sections
Chapter 4: Sieve Analysis and Gradation (ASTM C136 & Fineness Modulus)
4 sections
Chapter 5: Specific Gravity and Absorption of Coarse Aggregate (ASTM C127)
3 sections
Chapter 6: Specific Gravity and Absorption of Fine Aggregate (ASTM C128)
3 sections
Chapter 7: Moisture Content & Performance Examination Preparation (ASTM C566 & Practical Lab Skills)
3 sections
ACI Aggregate Level 1 Exam Details
ACI Aggregate Testing Technician Level 1
Administered by American Concrete Institute (ACI)
Exam Content Breakdown
Based on the official American Concrete Institute (ACI) content outline
Gradation procedures, fineness modulus calculation, sieve series, mass check tolerance, and sieving endpoint criteria
Bulk, bulk (SSD), and apparent relative density; wire basket buoyancy; absorption formula ((B-A)/A)*100
Pycnometer method, cone-and-tamper SSD verification, de-airing, and density formulas for fine aggregate
Moisture states, nominal maximum size, sieve sizes, ASTM C33 requirements, ACI certification rules
Field sampling from stockpiles, conveyors, and transportation units; minimum sample mass by NMAS
Method A (riffle splitter), Method B (quartering), Method C (miniature stockpile — damp fines only)
Washing procedure, sieve protection, endpoint (clear water), formula A=((B-C)/B)*100, ASTM C33 fines limits
Drying to constant mass at 110±5°C, p=100*(W-D)/D, free moisture vs absorption, batch water adjustment
3% NaOH color test, Gardner color standards, 24-hour standing time, follow-up with ASTM C87
What's Included
7 Chapters
Complete exam coverage
Practice Quizzes
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What's Next After the ACI Aggregate Level 1?
After passing the ACI Aggregate Level 1, you can pursue these career paths
ACI Aggregate Testing Technician Level 2
Advanced ACI aggregate lab cert covering ASTM C29 unit weight, C70 surface moisture, C88 soundness, C131/C535 L.A. abrasion; Level 1 is a prerequisite
ACI Field Testing Technician Grade I
ACI field-testing certification covering slump, air content, temperature, unit weight, and making concrete test cylinders
ACI Concrete Strength Testing Technician
ACI cert for compressive strength testing of hardened concrete per ASTM C39 and related standards
ACI Aggregate Level 1 Exam FAQ
Official American Concrete Institute (ACI) Resources
Verify information with these official sources
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