ATT Study Guide 2026
Everything you need to pass the ATT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 ATT Exam Format at a Glance
📚 ATT Topics to Study (69)
✍️ Sample ATT Questions & Answers
1. Which ASTM standard governs the Organic Impurities in Fine Aggregates for Concrete test?
ASTM C40 is the standard test method for organic impurities in fine aggregates for concrete.
2. According to ASTM C1260, an expansion of greater than 0.20% at 16 days indicates:
ASTM C1260 classifies expansion exceeding 0.20% at 16 days as potentially deleterious, indicating the aggregate may cause harmful ASR in service.
3. When sampling freshly mixed concrete at a job site for aggregate content verification, which standard governs obtaining the composite sample of fresh concrete?
ASTM C172 covers sampling freshly mixed concrete, from which aggregate-related tests such as unit weight and air content are then performed.
4. What is the significance of the 'increment' in aggregate sampling terminology?
An increment is one individual scoop or cut of material; multiple increments are combined to create the composite field sample used for testing.
5. When determining fine aggregate specific gravity by ASTM C128, the pycnometer is filled with water to what level after adding the aggregate?
The pycnometer is filled to its calibration mark to ensure a known, reproducible water volume.
6. When performing the organic impurities test (ASTM C40), a color darker than the standard indicates:
A color darker than the reference standard solution (Gardner Color Standard No. 11) suggests potentially harmful organic impurities requiring additional testing per ASTM C87.