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 30 FAQs.

Question: Curing and curling of concrete slabs over vapor retarders

Question: Estimating in-place concrete strength

Question: Why are many non-destructive tests used as “estimators” of concrete strength?

Question: Low-strength cylinder test results

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

Question: Using core strength to calculate compressive strength of an existing structure

Question: Standards for 7-day and 28-day strength test results

Question: Strength of concrete

Question: What test conditions affect the results of compressive strength tests of concrete?

Question: Curing Cylinders for Acceptance Testing

Question: The effect of maximum size of aggregate on concrete strength

Question: Mixture design and strength submittals

Question: Will the use of fibers impact the compressive strength of the concrete?

Question: Characteristics of cement that affect compressive strength

Question: The effect of surface texture and cleanness on concrete strength

Question: What is the effect of freezing on concrete?

Question: Are there data relating w/cm to flexural strength that are as reliable as those for compressive ...

Question: How are properties of concrete in the structure measured?

Question: Using cube tests in lieu of cylinder tests

Question: Protecting concrete from cycles of freezing and thawing

Question: Other important properties of concrete

Question: The importance of reinforcement in concrete

Question: The most important single factor affecting compressive strength

Question: Curling, shrinkage, and w/cm

Question: The effect of pozzolans on freezing and thawing resistance

Question: Definition of controlled low-strength material (CLSM)

Question: Definition of low-density concrete

Question: Rebound hammer and in-place strength testing

Question: Is pulse velocity related to strength?

Question: Chloride concentration in soil and exposure classes