Technical Questions

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

Question: What nominal maximum sizes of aggregate are recommended?

Question: Acceptable concrete cracking

Question: What is the importance of curing on strength?

Question: The effect of joints on the durability of concrete structures

Question: What is curing?

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

Question: Improving the abrasion resistance of concrete

Question: How can the effectiveness of curing be measured?

Question: Curling, shrinkage, and w/cm

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

Question: How is the required strength selected, measured, and obtained?

Question: Air tests for non-air-entrained concrete

Question: What methods are commonly used to ensure sufficient moisture for curing concrete?

Question: What is meant by properly cured concrete?

Question: Is there any measure of the completeness or adequacy of curing?

Question: When is steam curing used?

Question: How is the shrinkage of concrete determined?

Question: What is the purpose of finishing and texturing concrete surfaces?

Question: How does the temperature influence curing?

Question: Popouts or popoffs?

Question: The importance of proper drainage

Question: When can the finishing procedure be started?

Question: When does the slump test provide a useful indication of workability?

Question: What test is available to evaluate the behavior of no-slump concrete as it is vibrated?

Question: Vapor barriers

Question: Curing and curling of concrete slabs over vapor retarders

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