Abstract
Abstract The current study addresses the penetration of viscous fluids into compacted clay samples in the context of volume determination. The volume of compacted clay samples was measured with established methods (paraffin-coated clod method, pycnometer method) and uncoated immersion weighing (IW) with three different fluids (silicone oil, paraffin oil, and canola oil). The suitability of the methods was evaluated statistically. The amount of penetrated liquid into the sample was tracked over time and analyzed. Experimental data were fitted with a modified Washburn’s equation considering different pore sizes in the sample. The fitting yielded very good matches. IW was found to generate the most accurate (i.e., smallest error measurements) and reproducible results for volume determination among the established methods. Thereby, paraffin and silicone oil performed best for IW. The penetration of liquids into the sample was found to be negligibly small for those two liquids in the relevant time range for conducting an IW.
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