What Does ATT2 Stand For?

What Does ATT2 Stand For?

ATT2 stands for Aggregate Testing Technician - Level 2, a certification issued through the American Concrete Institute (ACI) and administered by ACI-approved sponsoring groups and examiners. It is the second tier in ACI's aggregate testing technician track, sitting above the Level 1 credential and focused on more advanced laboratory procedures used to characterize construction aggregates for concrete, asphalt, and base-material work.

Because several unrelated fields use the same three-letter shorthand, it's worth being precise here: this article covers only the ACI aggregate-testing credential. If you found this page while researching a different "ATT2," the facts below won't transfer - everything here is specific to ACI's aggregate testing program, its Job-Task Analysis, and its published certification policy. For a broader orientation to the credential itself, see What Is ATT2? and ATT2 Meaning.

Who Administers the ATT2 Credential

ATT2 is not a self-administered online badge. Examinations are delivered through ACI-approved sponsoring groups and examiners - typically regional chapters, ready-mix associations, or DOT-affiliated testing programs - rather than directly at ACI headquarters. This is why fee amounts, scheduling, and even review sessions vary by sponsoring group even though the underlying content requirements come from ACI's national policy documents.

The governing document is CPP 620.3-20, ACI's Certification Policies for Aggregate Testing Technician (revised September 21, 2020), which spells out eligibility, exam structure, and scoring rules. The content itself follows the Job-Task Analysis approved September 30, 2024, which defines the ten standards a Level 2 technician must know. If you want the full breakdown of what each standard covers, read ATT2 Exam Domains 2026: Complete Guide to All 10 Content Areas.

The Level 1 Prerequisite

You cannot walk into an ATT2 exam without first holding a current ACI Aggregate Testing Technician - Level 1 credential. This prerequisite matters for two reasons: it confirms baseline familiarity with fundamental aggregate sampling and testing concepts, and it means Level 2 candidates are expected to build on - not relearn - basic laboratory practice. Anyone still working toward Level 1, or unsure whether their Level 1 status is current enough to sit for Level 2, should check the eligibility rules laid out in ATT2 Requirements 2026: Eligibility, Prerequisites & How to Qualify before registering with a sponsoring group.

Two-Part Exam Structure

ATT2 certification requires passing two distinct components, and both must be completed to earn the credential:

• Written examination: Open-book, using only ACI-approved references, two hours long, approximately 100 multiple-choice questions. Each of the ten standards contributes roughly 8 to 12 questions.
• Performance examination: Closed-book. Candidates must correctly demonstrate - or, where permitted, verbally describe - the prescribed procedure steps for the practical standard areas.

Not every standard appears on the performance exam. AASHTO T 96/ASTM C131, AASHTO T 104/ASTM C88, and ASTM C535 are written-examination-only standards, which leaves seven standards as practical/performance areas. That distinction shapes how you should study: some domains only require you to reason through multiple-choice scenarios, while others require you to physically execute (or narrate) a procedure under observation.

A simple-function, nonprogrammable pocket calculator is permitted during testing - leave anything programmable or graphing at home. For a deeper look at exactly how demanding this two-part format is compared to other technician certifications, see How Hard Is the ATT2 Exam? Complete Difficulty Guide 2026.

The Ten Study Domains Behind ATT2

Every question on the written exam, and every task on the performance exam, maps back to one of ten standards defined in ACI's Job-Task Analysis. Knowing which standards are written-only versus practical helps you allocate study time realistically.

For a full narrative walkthrough of each standard's testing logic and common pitfalls, the companion piece ATT2 Exam Domains 2026: Complete Guide to All 10 Content Areas goes deeper than this summary.

Passing Requirements

ATT2 uses a dual scoring threshold on the written exam, plus an independent pass/fail outcome on the performance exam:

• At least 60% correct on every individual standard - you can't skip a weak domain and make it up elsewhere.
• At least 70% correct overall across all ten standards combined.
• Successful, separate completion of the closed-book performance examination.

Both thresholds on the written exam must be met simultaneously; a strong overall score doesn't save you if one standard falls below 60%. This per-domain minimum is exactly why generic "cram the whole test" study approaches tend to underperform for ATT2 - see ATT2 Passing Score 2026: Exactly What You Need to Pass for a closer look at how the math plays out, and ATT2 Pass Rate 2026: What the Data Shows for what the available data indicates about outcomes.

Registration and Fee Mechanics

Because sponsoring groups run their own sessions, published fees vary by region rather than being set as one flat national price. Two published 2026 examples illustrate the range:

These are named local packages, not a universal ACI price - always confirm current fees directly with the sponsoring group hosting your exam date. Separately, ACI's standalone CP-45 seventh-edition workbook costs $133 regular or $69 for ACI members, and is the primary official preparation resource referenced during the open-book written exam. For a fuller accounting of what candidates actually spend end-to-end, see ATT2 Certification Cost 2026: Complete Pricing Breakdown.

The One-Year Window and Recertification

Once you sit for either exam component, the clock starts: both the written and performance exams must be passed within one year of each other. If you pass the written exam but fail the performance exam (or vice versa), the passed component stays valid for use within that one-year period - you don't have to retake something you already passed. However, a failed component must be retaken in full, not partially.

Once earned, ATT2 certification is valid for five years. Recertification requires passing both the written and performance examinations again - there is no simple renewal fee or continuing-education substitute described in ACI's policy. Check ATT2 Exam Dates 2026: Testing Windows, Deadlines & Scheduling for how sponsoring groups typically schedule sessions within that one-year window.

Who Hires ATT2-Certified Technicians

ATT2-certified technicians typically work in materials testing labs, ready-mix concrete quality-control departments, aggregate producers, and DOT or municipal materials divisions - environments where aggregate gradation, soundness, and particle-shape testing directly feed into concrete mix design and pavement acceptance decisions. Because the credential builds on Level 1 and adds seven hands-on procedures, employers often treat it as evidence a technician can run a lab testing program with less direct supervision. If you're evaluating whether the credential fits your career plans, Is the ATT2 Certification Worth It? Complete ROI Analysis 2026 and ATT2 Salary Guide 2026: Complete Earnings Analysis walk through the considerations in more depth, and ATT2 Jobs covers where postings for this credential tend to appear.

Scheduling Your Prep Around the Ten Standards

Rather than studying the ten standards in a random order, sequence your preparation around exam format. Start with the three written-only standards (T 96/C131, T 104/C88, and C535) early, since they're purely conceptual and can be reviewed via practice questions without lab access. Save the seven practical standards - T 19, T 112, T 113, T 176, T 304, D4791, and D5821 - for weeks when you have hands-on lab or equipment access, since the performance exam rewards muscle memory over memorized theory.

This sequencing matters because of the scoring rule discussed earlier: a single weak domain under 60% fails the whole written exam regardless of your overall average. For a comprehensive week-by-week plan with more detail than this summary, see ATT2 Study Guide 2026: How to Pass on Your First Attempt, and for a compact last-minute reference, ATT2 Cheat Sheet 2026: One-Page Review of Must-Know Facts is built to condense all ten standards onto one page.

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