Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing
Edward J. Garboczi, Kenneth A. Snyder, Rolands Cepuritis, Stefan Jacobsen
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.
, Snyder, K.
, Cepuritis, R.
and Jacobsen, S.
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 July 4, 2022)