What Do We Know about the Contribution of Fly Ash to the Strength of Concrete?

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Title: What Do We Know about the Contribution of Fly Ash to the Strength of Concrete?

Author(s): Sandor Popovics

Publication: Special Publication

Volume: 91

Issue:

Appears on pages(s): 313-332

Keywords: compressive strength; concretes; fly ash; mineral admixtures; portland cements; quartz; water-cement ratio; water-cementitious ratio.

Date: 2/1/1986

Abstract:
Experiments are reported where the strength development of concretes is investigated containing 75% by weight of portland cement and 25% fly ash with various water-cementitious materials ratios. The strength results of these concretes are compared not only to concretes containing no mineral admixtures but also to concretes containing 75% by weight of portland cement and 25% quartz powder. New as well as old experimental data seem to in-dicate that the contribution of fly ash to the quality of concrete is not a constant value determined solely by the physical and chemical characteristics of the fly ash but rather it can vary in different concretes. For instance, the relative contribution of a fly ash to concrete strength is increasing with decreasing water-cementitious materials ratio. The paper closes with a discussion of research needed for the clarification of the factors that maximize the contribution of fly ash to the strength of concrete.