ACI Cheat Sheet 2026

The 30 highest-yield ACI facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. How should ACI professionals measure success in flatwork placement & leveling? → Using defined metrics, benchmarks, and regular evaluation against established goals
2. What is the relationship between color & texture finishing and overall American Concrete Institute Concrete Finisher professional competency? → It is an essential component that strengthens the overall competency framework
3. Punctures or tears in a vapor retarder discovered before concrete placement should be: → Repaired immediately with compatible tape before any concrete is placed
4. How does color & texture finishing contribute to professional excellence in ACI certification? → It enhances competency, improves outcomes, and supports continuous professional growth
5. What is the primary reason ACI requires proper subgrade preparation before placing a concrete slab? → To provide uniform support and prevent differential settlement
6. What is a key principle of concrete strength & testing methods in American Concrete Institute Concrete Finisher practice? → Applying structured methodologies based on evidence and best practices
7. What is the purpose of surface preparation in concrete finishing? → To ensure adhesion and cleanliness
8. What is a key principle of decorative concrete & stamping in American Concrete Institute Concrete Finisher practice? → Applying structured methodologies based on evidence and best practices
9. Which tool is used to smooth concrete after screeding? → Bull float
10. Synthetic fiber reinforcement added to concrete flatwork primarily serves to: → Reduce plastic shrinkage cracking during the early hours after placement
11. Why are admixtures used in concrete? → To enhance concrete performance
12. Delamination of a concrete slab surface occurs because: → Air or bleed water becomes trapped beneath a prematurely sealed surface
13. What is the most common cause of crazing in concrete flatwork? → Rapid drying of the surface before the concrete has set
14. For light industrial floor slabs, ACI 360R suggests a minimum slab-on-grade thickness of: → 5 to 6 inches
15. How does concrete strength & testing methods contribute to professional excellence in ACI certification? → It enhances competency, improves outcomes, and supports continuous professional growth
16. According to ACI 302.1R, the primary purpose of a vapor retarder beneath a concrete slab is to: → Prevent moisture from migrating upward through the slab and damaging floor coverings
17. Plastic shrinkage cracking differs from drying shrinkage cracking primarily because it occurs: → Before the concrete has achieved initial set
18. What does a higher FF or FL number indicate about a concrete floor? → A flatter and more level floor with smaller deviations
19. The main purpose of a granular subbase layer beneath a concrete slab-on-grade is to: → Provide a stable, uniform bearing surface and improve drainage
20. According to ACI, control joints in slabs on grade should be saw cut to a minimum depth of: → One-quarter of the slab thickness
21. When implementing color & texture finishing practices, what should ACI professionals prioritize? → Alignment with professional standards, stakeholder needs, and organizational goals
22. When implementing environmental & worker safety practices, what should ACI professionals prioritize? → Alignment with professional standards, stakeholder needs, and organizational goals
23. How does cold & hot weather concreting contribute to professional excellence in ACI certification? → It enhances competency, improves outcomes, and supports continuous professional growth
24. How does environmental & worker safety contribute to professional excellence in ACI certification? → It enhances competency, improves outcomes, and supports continuous professional growth
25. What is the effect of excessive water in a concrete mix? → Reduces strength
26. How should ACI professionals measure success in concrete strength & testing methods? → Using defined metrics, benchmarks, and regular evaluation against established goals
27. How should ACI professionals measure success in joint layout & crack control? → Using defined metrics, benchmarks, and regular evaluation against established goals
28. When should final troweling be done? → After surface has set slightly
29. For Class A applications (most moisture-sensitive floor coverings), ACI recommends a vapor retarder with a permeance not exceeding: → 0.01 perms
30. What challenge is most commonly encountered in decorative concrete & stamping within American Concrete Institute Concrete Finisher practice? → Resistance to change and difficulty maintaining consistency across stakeholders