Frequently Asked Questions

Technical Questions

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




Question: Embedded metals other than reinforcing steel

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

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

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

Question: Epoxy-coated reinforcement and cover depth against ground

Question: Reinforcement termination in wastewater concrete containment

Question: Difference between a contraction joint, isolation joint, expansion joint, construction joint, and a cold joint

Question: Consolidation of concrete—required or not?

Question: Epoxy-coated reinforcement

Question: Acceptable concrete cracking

Question: What nominal maximum sizes of aggregate are recommended?

Question: Minimum concrete cover for balconies with PT cables

Question: Reinforced concrete vs. prestressed concrete

Question: The importance of reinforcement in concrete

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

Question: Standard on detailing of concrete reinforcement

Question: What is reinforced concrete?

Question: The importance of concrete cover

Question: How is workability measured and specified?

Question: How is concrete consolidated?

Question: Do we always need to repair cracked concrete?

Question: Shear reinforcement for beam-column connections

Question: Why is consolidation needed?

Question: How do the requirements of placing affect the selection of proportions of aggregates and cementitious material?

Question: Why is the workability of concrete important?

Question: What is an admixture?


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