Fly Ash and Concrete Durability


  • 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.

International Concrete Abstracts Portal


Title: Fly Ash and Concrete Durability

Author(s): P. Klieger and S. Gebler

Publication: Special Publication

Volume: 100


Appears on pages(s): 1043-1069

Keywords: air entrainment; alkali-aggregate reactions: concrete durability; deicers; evaluation; fly ash; freeze-thaw durability; sulfate resistance

Date: 4/1/1987

Concretes containing Class F and Class C fly ashes were evaluated with respect to various aspects of concrete durability. A majority oE concretes with fly ash produced stable air-void systems; however, the volume of air retained over a period of 90 minutes was adversely affected, more in Class F than Class C fly ash concretes. Concretes with fly ash requiring a high dosage of air-entraining admixture generally exhi.bited poor retention of original air content. Organic matter content of the fly ash affected air-entraining admixture dosage and air content stability. Air-entrained concrete with or without fly ash and cured at 73OF (23OC) generally showed good resistance to Ereezing and thawing: however, when these concretes were cured at low temperature, Class F fly ash concretes showed slightly less resistance to freezing and thawing than Class C fly ash concretes. Deicer scaling tests showed that air-entrained concretes without fly ash performed better than fly ash concretes, regardless of curing provided. Both Class C and Class F fly ash concretes exhibited similar performance when subjected to deicer chemicals during freezing and thawing. The chloride-ion penetration of concrete made with fly ash was not signi.Eicantly affected by the class of fly ash. Class F fly ashes were significantly more effective as inhibitors of alkali-silica reaction expansion in mortar bars than were Class C fly ashes. Class F fly ashes significantly improved the sulfate resistance of concrete made with a cement containing 8 % C3A. Concretes with Class C fly ashes exhibited poor performance to sulfate solution.