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
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.
American Concrete Institute
38800 Country Club Dr.
Farmington Hills, MI
Feedback via Email
Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Sulfate Resistance of Fly Ash Concretes--The R-Value
Author(s): Edwin R. Dunstan, Jr.
Publication: Special Publication
Appears on pages(s): 2027-2040
Keywords: chemical analysis; concrete durability; expansion; fly ash; mortars (material); sodium sulfate; sulfate resistance; tests; General
Abstract:In 1973 the Bureau of Reclamation began research on the use of subbituminous and lignite fly ashes in concrete. By 1978 that research had led to the development of the fly ash R-value as an advance indicator of potential sulfate resistance of concretes containing fly ash. The R-value is calculated from results of a chemical analysis of the fly ash as (percent of CaO - 5)/(percent of Fe2O3). This paper is a review after more than 12 years of sulfate resistance testing. Many of the fly ash concretes in this research have failed in sulfate testing over the last 12 years; however, many of these concretes have not failed and are still under test. These sulfate resistance test results indicate that the R-value remains a good indicator of potential sulfate resistance of fly ash concretes. When concrete contains 15 to 25 percent fly ash with an R-value less than 3.0 the sulfate resistance will be equal or better than a concrete with the same cement and no fly ash.
Click here to become an online Journal subscriber