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 and glass bead with wide range grain sizes, to understand the effect size micro-pore structure fractal characteristics carbonate-based sand silicate-based sand. The pore distribution (PSD) tested materials were obtained from NMR T2 spectra, theory introduced describe properties PSD. Results demonstrate that has significant PSD As increases, sands evolves binary two peaks ternary three peaks. increase in can cause remarkable maximum size. It is also found more irregular particle shape, better continuity between large medium pores. addition, considerable dimension structure. lead heterogeneity for bead.