Technical Questions

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



Do all fly ashes behave in a similar way?

Q. Do all fly ashes behave in a similar way?

 

A. No, Class F fly ash has little lime and is purely pozzolanic; Class C fly ash typically has a high lime content and is self-cementing. Fly ashes may also have other chemically reactive constituents. All fly ashes possess pozzolanic properties. They have different characteristics in strength development and resistance to chemical attack.

 

References: SP-1(02); ACI CT-18; SP-242; ACI 232.2R-03; ASTM C618; ACI PRC-232.4-20

Topics in Concrete: Fly Ash; Concrete Fundamentals; Materials in Concrete; Pozzolan

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.