Title:
What Do We Know about the Contribution of Fly Ash to the Strength of Concrete?
Author(s):
Sandor Popovics
Publication:
Symposium Paper
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.
DOI:
10.14359/10076
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.