Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing

Published

March 1, 2017

Author(s)

Edward J. Garboczi, Kenneth A. Snyder, Rolands Cepuritis, Stefan Jacobsen

Abstract

The shape of concrete aggregate fines, with particle sizes between 3 µm and 250 µm, produced by high-speed vertical shaft impact (VSI) crushing of 10 different rock types from quarries in Norway, has been studied by both dynamic image analysis (DIA), which is a 2-D method, and X-ray microcomputed tomography (µCT) coupled with spherical harmonic (SH) analysis, which is a 3-D method. The 3-D µCT results serve as a check on the 2-D DIA results. The intent was to evaluate the applicability of the 2-D DIA method to extract shape parameters that could represent the actual 3-D shape of the VSI crushed concrete aggregate particles. The results show that the 2-D DIA method seems to have problems correctly detecting separate particles and measuring their shapes for grains smaller than about 40 µm due to possible problems with particle dispersion. However, if a large enough number of particles bigger than 40 µm are analysed by the 2-D DIA method, a good but limited indication of the actual 3-D shape of the irregular crushed aggregate fines particles can be acquired and used for simple quality control at hard rock quarries.

Citation

Powder Technology

Volume

309

Pub Type

Journals

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DOI Link

Keywords

Crushed aggregate fines, vertical shaft impact crusher, shape, dynamic image analysis, X-ray computed tomography

Citation

Garboczi, E. , Snyder, K. , Cepuritis, R. and Jacobsen, S. (2017), Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing, Powder Technology, [online], https://doi.org/10.1016/j.powtec.2016.12.037 (Accessed December 4, 2024)