Email Address is required Invalid Email Address
In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Learn More
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
Staff Directory
ACI World Headquarters 38800 Country Club Dr. Farmington Hills, MI 48331-3439 USA Phone: 1.248.848.3800 Fax: 1.248.848.3701
ACI Middle East Regional Office Second Floor, Office #207 The Offices 2 Building, One Central Dubai World Trade Center Complex Dubai, UAE Phone: +971.4.516.3208 & 3209
ACI Resource Center Southern California Midwest Mid Atlantic
Feedback via Email Phone: 1.248.848.3800
Home > Tools > Frequently Asked Questions
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-23; SP-242; ACI 232.2R-03; ASTM C618; ACI PRC-232.4-20 Topics in Concrete: Fly Ash; Concrete Fundamentals; Materials in Concrete; Pozzolan
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-23; SP-242; ACI 232.2R-03; ASTM C618; ACI PRC-232.4-20
Topics in Concrete: Fly Ash; Concrete Fundamentals; Materials in Concrete; Pozzolan
Search other resources on the ACI website for answers to technical questions