https://doi.org/10.1051/epjconf/202124907012
Packing density of bi-disperse mixtures under one-dimensional compression
1
Politecnico di Milano, Department of Civil and Environmental Engineering (DICA). Piazza Leonardo Da Vinci 32, 20133 Milan.
2
Università degli Studi di Tor Vergata, Department of Civil and Informatic Engineering (DICII). Via del Politecnico 1, 00133 Rome.
* e-mail: giulia.guida@polimi.it
Published online: 7 June 2021
This work aims to investigate the effect of fines in different type of bi-disperse grain size distributions in terms of minimum/maximum density, compressibility and crushing. The material adopted is the Light Expanded Clay Aggregate (LECA), an artificial granular material characterized by light, porous and crushable grains. The bi-disperse grading are firstly analysed in terms of packing density, measuring experimentally the minimum and the maximum porosity for different combination of sizes and volume proportions. Then, some selected mixtures are subjected to one-dimensional compression tests up to high pressures. Evolution of grain size due to grain crushing phenomena and compressibility are therefore measured and interpreted. Finally a theoretical model is adopted in order to predict the mechanical material response accounting grain crushing and granular microstructure.
A video is available at https://doi.org/10.48448/8c1q-kf15
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
