Frequently Asked Questions

In This Section

Other Sources for Answers

Search other resources on the ACI website for answers to technical questions

Technical Questions

ACI Committees, Membership, and Staff have answered common questions on a variety of concrete related topics.



Found 36 FAQs.

Question: Epoxy-coated reinforcement

Question: What is reinforced concrete?

Question: Reinforced concrete vs. prestressed concrete

Question: The importance of reinforcement in concrete

Question: Embedded metals other than reinforcing steel

Question: Reinforcement termination in wastewater concrete containment

Question: What are shrinkage-compensating expansive cement and concrete?

Question: Increasing the load capacity of a slab-on-ground using an overlay

Question: Does incorporating fiber as an alternative to traditional reinforcement enhance the environmenta...

Question: Difference between a contraction joint, isolation joint, expansion joint, construction joint, an...

Question: How should the concrete be consolidated to obtain a complete filling of the forms and around the...

Question: Epoxy-coated reinforcement and cover depth against ground

Question: Acceptable concrete cracking

Question: Shear Design Provisions in ACI 318-19

Question: What are the primary benefits of using fiber-reinforced concrete compared to traditionally reinf...

Question: What is minimum reinforcement for crack-width control and how is design accomplished using fiber?

Question: Minimum concrete cover for balconies with PT cables

Question: What nominal maximum sizes of aggregate are recommended?

Question: Where is fiber-reinforced concrete mostly used in practice?

Question: Consolidation of concrete—required or not?

Question: Standard on detailing of concrete reinforcement

Question: What is the difference between synthetic microfibers and macrofibers?

Question: Placement of welded wire reinforcement (WWR) in a slab-on-ground

Question: How do fibers work?

Question: Shear reinforcement for beam-column connections

Question: How is workability measured and specified?

Question: How is concrete consolidated?

Question: Why use fiber-reinforced concrete?

Question: Do we always need to repair cracked concrete?

Question: Why are fibers used in concrete?

Question: Are all fibers used in concrete the same?

Question: Why is consolidation needed?

Question: The importance of concrete cover

Question: How do the requirements of placing affect the selection of proportions of aggregates and cementi...

Question: Why is the workability of concrete important?

Question: What is an admixture?