Abstract
In this study, a series of nuclear magnetic resonance (NMR) tests was conducted on calcareous sand, quartz sand, and glass bead with a wide range of grain sizes, to understand the effect of grain size on the micro-pore structure and fractal characteristics of the carbonate-based sand and silicate-based sand. The pore size distribution (PSD) of the tested materials were obtained from the NMR T2 spectra, and fractal theory was introduced to describe the fractal properties of PSD. Results demonstrate that grain size has a significant effect on the PSD of carbonate-based sand and silicate-based sand. As grain size increases, the PSD of sands evolves from a binary structure with two peaks to a ternary structure with three peaks. The increase in the grain size can cause a remarkable increase in the maximum pore size. It is also found that the more irregular the particle shape, the better the continuity between the large and medium pores. In addition, grain size has a considerable effect on the fractal dimension of the micro-pore structure. The increase of grain size can lead to a significant increase in the heterogeneity and fractal dimension in PSD for calcareous sand, quartz sand and glass bead.
Highlights
A series of nuclear magnetic resonance (NMR) tests was conducted on calcareous sand, quartz sand, and glass bead with a wide range of grain sizes
It can be observed that the grain size significantly affects the pore size distribution curve of calcareous sand
The results show the pore size distribution curves of glass 7b is the difference theNote porethat sizeindistribution quartz sand100 with beads all have between three peaks
Summary
Siliceous-based sand is mainly distributed on the continent [1], which is applied to terrigenous geotechnical projects, such as roads, foundation pits, slopes, tunnels, etc. Calcareous-based sand, formed by the geological deposition of marine biological debris, is widely distributed onshore and offshore. It is commonly used in land reclamation projects. Carbonate-based sand has more complex mechanical properties than silicate-based sand because its particle shape is more irregular [2,3,4,5,6,7,8,9,10,11,12,13,14,15]. It is essential to investigate the micropore structure of carbonate-based sand and silicate sand for a better understanding of their macroscopic mechanical behaviors
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