Study of a Class C Fly Ash Concrete


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Title: Study of a Class C Fly Ash Concrete

Author(s): Robert L. Yuan and James E. Cook

Publication: Special Publication

Volume: 79


Appears on pages(s): 307-320

Keywords: compressive strength; concrete durability; concretes; creep properties; drying shrinkage; fly ash; freeze-thaw durability; shrinkaqe. --

Date: 5/1/1983

This paper describes an experimental investigation into the behavior of fly-ash concrete with respect to strength, durability, shrinkage and creep deformations. A subbituminous coal ash conforming to Class C requirements of ASTM C-618 was used. The use of fly ash as a partial replacement for cement ranges from twenty percent to fifty percent by weight of the cement. These studies confirm that (1) the rate of strength development of Class C fly-ash concrete is comparable with that of portland cement concrete; (2) the effect of fly ash content on the shrinkage deformation is not as significant as the effect of water/cement ratio, (3) for a given water/cement ratio, creep deformation is influenced by the fly ash content and (4) con-crete with fly ash content 20 percent replacement show a better freeze-thaw durability than portland cement concrete.