INFLUENCE OF THE GRADING OF AGGREGATES ON CONCRETE MIX PROPORTIONS

It is well known that aggregate grading directly influences concrete mix proportions and that satisfactory concrete can be produced with aggregates whose gradings do not fall entirely within normal specifications or conform with typical grading curves. In developing countries and particularly on small islands, such aggregates are often the only ones locally available or within economic destance, and the concrete manufacturer has no choice but to select the most suitable mix proportions. The paper discusses the influence of grading on mix proportions and describes the determination of economic proportions using aggregates available on three islands of the eastern Caribbean. On one island, the coarse aggregate consists of coral limestone containing a significant percentage is a very fine, uniformly sized sand. On another island, the excessive use of beach sand has necessitated the investigation of concrete-making properties of a local "pumice," a significant fraction of which passes the No. 100 sieve. Results show that, with suitable selection of mix proportions, these aggregates make satisfactory concrete.

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 44-55
  • Monograph Title: Grading of concrete aggregates
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00159546
  • Record Type: Publication
  • ISBN: 0309021723
  • Files: TRIS, TRB
  • Created Date: Sep 20 1977 12:00AM