Fig. 1

a Scanning electron microscope (SEM) image and b micro-CTÂ tomograph image of the Mount Gambier limestone showing strong micro-structural heterogeneity. c Normalized incremental intruded volume, and cumulative porosity versus pore diameter in semi-logarithmic scale, obtained by mercury intrusion capillary pressure porosimetry (MICP). The three tests show representative results of a total of 9 measurements. The shadow areas correspond pore-size ranges of the two samples to be resolved by X-ray micro-tomography