Title:
Bridging the Gap: Proportioning with Fly Ash
Author(s):
Robert W. Cannon
Publication:
Concrete International
Volume:
20
Issue:
9
Appears on pages(s):
49-55
Keywords:
admixtures; cements; compressive strength; fly ash; mix proportioning;
superplasticizers;
DOI:
Date:
9/1/1998
Abstract:
Utilization of fly ash is well accepted by most engineering firms although many still limit its application to some preconceived idea of cement replacement. Fly ash has also been recognized as a principal ingredient in today’s high-tech concrete in order to provide the boost in strength needed to achieve very high compressive strengths at ages greater than 28 days. Most design engineers working with specifications are principally concerned with the design strength of concrete and have little interest in the proportioning of concrete mixtures. Variations in the quality of fly ash have significantly less impact on the strength of concrete than the variations in quality of cement. Concrete mixtures can be proportioned for a given strength requirement as readily with fly ash as without.