Technical Questions

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




Question: What is a natural pozzolan?

Question: What is a pozzolan?

Question: What does a pozzolan do in the concrete?

Question: Importance of using pozzolans in hydraulic and environmental structures

Question: Are pozzolans all alike?

Question: The effect of pozzolans on water demand

Question: The effect of pozzolans on shrinkage

Question: The effect of pozzolans on freezing and thawing resistance

Question: Using and handling pozzolans

Question: Pozzolans in mass concrete

Question: How can durable aggregates be ensured?

Question: Do all fly ashes behave in a similar way?

Question: What are blended cements?

Question: Why is Type IV cement rarely produced and Type V cement rarely used?

Question: What is silica fume?

Question: Are retarding admixtures reliable as to the time of setting?

Question: Protecting against excessive expansion due to alkali-aggregate reaction (AAR)

Question: Could a sulfate-resisting cement and slag cement be combined and used for concrete exposed to sulfates attack?

Question: Hardening of hydraulic cement

Question: The effect of entrained air on the workability of concrete

Question: Factors affecting permeability

Question: What is fly ash?

Question: Important requirements of a concrete aggregate

Question: Precautions against sulfate attack

Question: What is curing?

Question: How does the temperature influence curing?

Question: Will concrete continue to increase in strength if there is no moisture present?

Question: How is the resistance to sulfate determined?

Question: How to Control Mass Concrete Temperature during Construction

Question: Definition of concrete, hydraulic cement, mortar, and grout


Other Sources for Answers

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

Please enter this 5 digit unlock code on the web page.