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
ACI Global Home Middle East Region Portal Western Europe Region Portal
Home > Tools > Frequently Asked Questions
Q. How does air content affect strength? A. Intentionally entrained air voids improve the resistance of concrete to damage from cycles of freezing and thawing. Any air voids reduce the strength of concrete, with about a 5% reduction in strength for each 1% increase in the volume of air voids. Air voids, however, also improve the workability of concrete. Therefore, air-entrained concrete at a lower w/cm can be prepared to provide similar workability to non-airentrained concrete, thus compensating to some extent for the reduction in strength. References: SP-1(02); E4-22; ACI 212.3R-16 Topics in Concrete: Admixture; Concrete Fundamentals; Quality Assurance; Testing of Concrete
Q. How does air content affect strength?
A. Intentionally entrained air voids improve the resistance of concrete to damage from cycles of freezing and thawing. Any air voids reduce the strength of concrete, with about a 5% reduction in strength for each 1% increase in the volume of air voids. Air voids, however, also improve the workability of concrete. Therefore, air-entrained concrete at a lower w/cm can be prepared to provide similar workability to non-airentrained concrete, thus compensating to some extent for the reduction in strength.
References: SP-1(02); E4-22; ACI 212.3R-16
Topics in Concrete: Admixture; Concrete Fundamentals; Quality Assurance; Testing of Concrete
Search other resources on the ACI website for answers to technical questions