Three-dimensional shape characterization of fine sands and the influence of particle shape on the packing and workability of mortars

Pierre Estephane*, Edward J. Garboczi, Jeffrey W. Bullard, Olafur H. Wallevik

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

This paper studies a selection of fine sands, their particle shape and its effect on the plastic properties of mortars via the influence on the workability and packing of cementitious mixtures. Five sands from different sources were sampled, wet sieved, and classified into six size classes: 20 μm–75 μm, 75 μm–150 μm, 150 μm–300 μm, 300 μm–600 μm, 600 μm to 1.18 mm and 1.18 mm–2.36 mm. Particle shape was measured and various geometrical quantities were determined for particles of each class using a combination of X-ray microcomputed tomography (μCT) and spherical harmonic analysis. Specimen preparation, scanning method, minimum required number of particles in a representative sample, and shape histograms are all discussed, and used to classify and compare the shape of the particles of each material type and size class. This information is then used to establish a connection between sand particle shape and the wet packing density, the workability in the form of slump-flow, and the water demand in mortar mixtures.

Original languageEnglish
Pages (from-to)125-142
Number of pages18
JournalCement and Concrete Composites
Volume97
DOIs
Publication statusPublished - Mar 2019

Bibliographical note

Publisher Copyright:
© 2018 Elsevier Ltd

Other keywords

  • Mortar
  • Packing
  • Sand
  • Sand shape
  • Spherical harmonics
  • Tomography
  • Workability

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