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: Fly Ash Aggregates
Author(s): J. Bijen
Publication: Special Publication
Appears on pages(s): 495-518
Keywords: aggregates; bonding; briquetting; costs; energy; fly
ash; manufacturing; pelleting; sintering.
Abstract:The disposal of powdered coal fly ash is meeting objections, especially in heavily populated areas. The rate of utilization, however, in any country rarely exceeds fifty percent. In the Netherlands attention has been drawn to the production of artificial aggregates from fly ash to obviate the need of disposal. This is stimulated by the increasing scarcity of exploitable resources of coarse aggregates. This paper discusses a number of techniques to produce artificial aggregates from fly ash and describes methods of agglomerating and bonding of fly ash particles. The main agglomeration techniques are agitation and compaction. Bonding processes are subdivided into sintering, hydro-thermal processes and 'cold' bonding. In cold bonding the pozzolanic behaviour of fly ash is used. As a binder, lime or cement is applied, and optionally additions of calcium sulfate or sulfite. For each type of bonding one aggregate is evaluated. The fly ash aggregate processed on a sintering grate showsthe best quality and also has the lightest weight. The costs Of production are lowest for the cold bonded product, which seems to be competitive with ordinary natural aggregate in the Netherlands. However, to obtain the same target strength more Cement will be needed for the artificial fly ash aggregates.
Click here to become an online Journal subscriber