What Is ATT2?

What ATT2 Actually Stands For

ATT2 stands for Aggregate Testing Technician - Level 2, a certification issued through the American Concrete Institute (ACI) and delivered by ACI-approved sponsoring groups and examiners rather than by ACI directly at a single national site. If you've searched terms like ATT2 Meaning or What Does ATT2 Stand For?, this is the credential those pages are describing - a hands-on, standards-based qualification for technicians who evaluate coarse and fine aggregate used in concrete production.

ATT2 is not a generic aggregate testing badge. It is defined by a specific document set: the ACI Job-Task Analysis approved September 30, 2024, and the administration rules in CPP 620.3-20 (revised September 21, 2020). Those two documents govern everything from which standards appear on the exam to how many questions are asked per topic. For a broader overview of the credential itself, see ATT2 Certification and What Is ATT2 Certification?.

Prerequisites: Why Level 1 Comes First

You cannot sit for ATT2 without holding a current ACI Aggregate Testing Technician - Level 1 credential. This isn't a suggestion - it's a hard eligibility gate built into ACI's certification policy. Level 2 assumes you already know basic sampling, sieve mechanics, and general lab safety from Level 1, and it builds directly on that foundation with more specialized and higher-stakes testing procedures.

If you're still confirming whether you meet the prerequisite chain, review ATT2 Requirements 2026: Eligibility, Prerequisites & How to Qualify before registering with a sponsoring group. Skipping this check is one of the most common reasons candidates get turned away on exam day.

Exam Structure: Written and Performance Components

ATT2 certification has two distinct exams, and you must pass both:

• Written examination: Open-book, using only ACI-approved references, two hours long, approximately 100 multiple-choice questions. Each of the ten standards gets eight to 12 questions, so no single topic dominates the paper.
• Performance examination: Closed-book. You physically demonstrate the prescribed steps of a procedure, or in some cases describe them verbally when demonstration isn't practical, under an examiner's observation.

Because the written portion is open-book, memorizing every numeric tolerance word-for-word matters less than knowing exactly where to find it in your references and how to apply it quickly. The performance exam flips that dynamic entirely - there's no reference to flip through, so muscle memory and sequence recall are what get tested. A simple-function, nonprogrammable pocket calculator is permitted for calculations on both components.

The Ten ATT2 Study Domains

ATT2's content is organized around ten AASHTO/ASTM standards. Seven of them appear on both the written and performance exams; three appear on the written exam only. Knowing which is which changes how you allocate practice time.

For a deeper breakdown of each standard's testable details and how examiners weight them, see ATT2 Exam Domains 2026: Complete Guide to All 10 Content Areas.

Scoring Rules and Time Limits

ATT2's passing standard has two layers, and missing either one fails the written exam:

• At least 60% correct on every individual standard - you can't offset a weak domain with a strong one.
• At least 70% correct overall across all approximately 100 questions.

Then, separately, you must successfully complete the performance examination. Both components must be passed within a one-year window. If you pass the written exam but fail the performance exam (or vice versa), the passed component stays valid for that year while you retake only the failed one - but a failed component must be retaken in full, not partially. For the exact numeric thresholds and how they interact, read ATT2 Passing Score 2026: Exactly What You Need to Pass.

This per-standard minimum is arguably the most-overlooked rule in ATT2 prep. A candidate can score well above 70% overall and still fail because one standard - often a written-only one like soundness testing - dropped below 60%. That's a direct argument for even, domain-by-domain review rather than cramming only the standards that feel intuitive.

What ATT2 Certification Costs

ATT2 doesn't have a single national exam fee; pricing is set by the sponsoring chapter or organization running your session, and packages vary in what they bundle. Two published 2026 examples illustrate the range:

On top of any chapter fee, ACI sells the standalone CP-45 seventh-edition workbook for USD 133 regular or USD 69 for ACI members, if your sponsoring group doesn't bundle it in. Because these are local packages rather than a fixed national rate, the total you pay depends heavily on which chapter or provider you register through and whether you're a member. A full comparison of these packages and what drives the price difference is in ATT2 Certification Cost 2026: Complete Pricing Breakdown.

Who Needs ATT2 and Where It's Used

ATT2 is aimed at technicians who already hold Level 1 and now need to run more specialized aggregate quality tests independently - things like sand equivalent testing, particle shape evaluation, and soundness screening. Employers who typically require or reward this credential include aggregate producers, ready-mix concrete suppliers, materials testing labs, and DOT-adjacent quality-control roles where sampled aggregate must meet project specifications before it goes into a mix design.

Because the certification maps directly to specific AASHTO and ASTM standards, it's often listed as a qualification requirement on lab technician postings rather than a "nice to have." If you're evaluating whether pursuing it fits your career path, Is the ATT2 Certification Worth It? Complete ROI Analysis 2026 and ATT2 Jobs both dig into where the credential actually gets used on job listings.

Mapping a Study Schedule to the Domains

Generic study techniques only help if they're applied against ATT2's actual structure. Given that seven domains carry weight on both exam components and three are written-only, a sensible split is to front-load the double-weighted practical domains - T 19, T 112, T 113, T 176, T 304, D4791, and D5821 - early enough to also rehearse them physically, then layer in the written-only standards (T 96, T 104, C535) once your open-book reference navigation is solid.

For a structured walkthrough that goes beyond this outline, see ATT2 Study Guide 2026: How to Pass on Your First Attempt, and use ATT2 Cheat Sheet 2026: One-Page Review of Must-Know Facts for last-week review. If you want a realistic sense of difficulty before committing to a schedule, How Hard Is the ATT2 Exam? Complete Difficulty Guide 2026 and ATT2 Pass Rate 2026: What the Data Shows are worth reading first.

Certification Length and Recertification

ATT2 certification is valid for five years. Recertifying requires passing both the written and performance examinations again - there is no abbreviated renewal path or continuing-education substitute described in ACI's policy. That means the same two-part structure, the same per-standard 60% threshold, and the same 70% overall requirement apply the second time around, even for technicians who've been actively testing aggregate the entire five years.

Before your certification lapses, it's worth checking ATT2 Exam Dates 2026: Testing Windows, Deadlines & Scheduling to line up a sponsoring group's schedule with your renewal deadline, since availability varies by chapter and region.

If you're still getting oriented to the basics of the credential before diving into domain-level prep, our practice platform at the ATT2 practice test hub walks through sample questions modeled on the written exam's format, and related explainer pages like What Is ATT2?, What Is A ATT2?, and What Does ATT2 Mean? cover the terminology from different angles. For hands-on preparation resources beyond reading, ATT2 Training outlines what sponsoring groups typically offer alongside the exam itself, and you can return to the main practice test site anytime to drill written-exam-style questions across all ten domains.

Frequently Asked Questions