Title:
On Aggregate Grading
Author(s):
Karthik H. Obla and Haejin Kim
Publication:
Concrete International
Volume:
30
Issue:
3
Appears on pages(s):
45-50
Keywords:
aggregate grading; coarseness factor; mixture proportions; packing density; void ratio
DOI:
Date:
3/1/2008
Abstract:
Advocates of mixtures containing well graded combined aggregates argue that such mixtures have optimized packing and minimal voids and therefore minimize the cementitious paste required for a given workability. Opponents of well graded combined aggregates argue that they don’t necessarily lead to optimized performance, but might actually cost more. In an effort to resolve the controversy, a study was conducted at the National Ready Mixed Concrete Association Research Laboratory to determine whether well graded combined aggregates improve aggregate packing density and concrete performance. A summary of the research report is provided in this article.