ACI Aggregate Testing Technician Certification

2025/2026 ACI AGGREGATE TESTING TECHNICIAN (ATT)

Please review the class schedule and recommendations below.

  1. Class will begin at 8:30 am and end at 4:00 pm on Day One.
  2. Day 2 will begin with the written and practical exam and will start at 8:30 am. Day 2 should end around 12 pm.
  3. This is a certification course and not a complete training class. Students are expected to be familiar with the course material and how to perform the tests before arriving to the certification course.
  4. First day of class will be a review of the AASHTO standards, followed by a laboratory practice session. Students who don’t regularly work in an aggregate laboratory environment should do a thorough review of the materials and test methods prior to class.
  5. Be prepared to test aggregates – wear safety boots or shoes, clothes that you don’t mind getting dirt and dust on, and safety glasses. Gloves will be provided, but feel free to bring your own.
  6. The sessions will be limited to 15 students.
  7. The MCA will have disposable masks and gloves available.
  8. Each student will receive their classroom materials, including the ACI Aggregate Testing Technician Level 1 Certification workbook, 2 weeks before the exam.
  9. Lunch will be provided on Day 1. Pre-packaged snacks and beverages will be available on both days.
  10. Doors to the certification center will be open 15 minutes prior to the class starting.
  11. Prior to attending class, if you need ADA accommodation, are sick or have other disabilities, or have physical limitations, you must comply with ACI pre-certification qualification before being granted any special exceptions to the program. You must contact ACI Certification at aci.certification@concrete.org before attending class!

PLEASE NOTE- THIS CERTIFICTION IS FOR LAB TECHNICIANS THAT NEED TO COMPLY WITH ASTM 1077 OR AASHTO LAB REQUIREMENTS FOR PERFORMING AGGREGATE TESTING. THIS COURSE DOES NOT CERTIFY TECHNICIANS TO PERFORM AGGREGATE QA TESTS FOR MDOT PROJECTS.

If you have questions, please contact our office at 517.347.7720.

 

REGISTRATION OPENS IN OCTOBER EACH YEAR

TOPICS COVERED

The course covers the following AASHTO aggregate test methods:
R 90 Sampling of Aggregates

R 76 Reducing Samples of Aggregate to Test Size

T 11 Materials Finer than No. 200 Sieve by Washing

T 27 Sieve Analysis of Fine & Coarse Aggregates

T 85 Specific Gravity & Absorption of Course Aggregate

T 84 Specific Gravity & Absorption of Fine Aggregate

T 255 Total Evaporable Moisture Content by Drying

T 21 Organic Impurities in Fine Aggregate

Exam

The “open book” written exam consists of 100 multiple choice questions divided into eight sections. Each section covers an individual AASHTO standard. Passing requires a minimum overall score of 70% AND a minimum score of 60% on each individual standard. Students have two hours to complete the written exam. 

For the performance exam, students are evaluated on their ability to correctly perform the required procedures for each of the AASHTO standards.

Note: Students successfully passing both the ACI CST and ACI ATT certifications will also receive ACI's Laboratory Testing Technician - Grade I Certification.