Rheological and mechanical properties of mortars prepared with natural and manufactured sands

D. D. Cortes, H. K. Kim*, A. M. Palomino, J. C. Santamarina

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

132 Scopus citations

Abstract

The conventional assessment methods for fine aggregate used in Portland cement concrete are mostly based on round natural sand performance in spite of the increasing use of angular manufactured sands. Two natural and two manufactured sands were selected and tested at different water-cement ratios and fine aggregate-to-cement ratios for the same standard gradation to identify shape-related differences on the mechanical performance of mortars. Three tests were used in this study: flowability, stiffness and strength. Results showed that adequate flow and compressive strength were attained when the volume of paste exceeded the volume of voids in the loosely packed aggregate, i.e., just above the maximum void ratio emax of the fine aggregate. Given the dependence of emax on particle shape, mixture predesign can be facilitated by taking aggregate shape into consideration.

Original languageEnglish (US)
Pages (from-to)1142-1147
Number of pages6
JournalCement and Concrete Research
Volume38
Issue number10
DOIs
StatePublished - Oct 2008
Externally publishedYes

Keywords

  • Aggregate
  • Compressive strength
  • Mixture proportioning
  • Mortar

ASJC Scopus subject areas

  • Building and Construction
  • General Materials Science

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