Effect of Grain Size on Microscopic Pore Structure and Fractal Characteristics of Carbonate-Based Sand and Silicate-Based Sand

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-ba...

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Bibliographic Details
Published in:Fractal and fractional 2021-12, Vol.5 (4), p.152
Main Authors: He, Shao-Heng, Ding, Zhi, Hu, Hai-Bo, Gao, Min
Format: Article
Language:English
Subjects:
calcareous sand
Equilibrium
fractal dimension
Fractal geometry
Fractals
Grain size
Granular materials
Heterogeneity
Magnetic fields
Measurement techniques
Mechanical properties
NMR
Nuclear magnetic resonance
Particle shape
Particle size distribution
Pore size
Pore size distribution
Quartz
quartz sand
Sand
Sand & gravel
Shear strength
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Summary: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.
ISSN:2504-3110
2504-3110
DOI:10.3390/fractalfract5040152