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Measuring the water retention curve of rock fragments: A novel repacked core methodology

We describe a novel suction plate experiment that uses large, repacked soil cores comprising clasts and a fine‐textured matrix to accurately measure the water retention curve of rock fragments (RFs) of high and low porosity. The method incorporates a suction plate‐core containment system that can be weighed as a unit, to overcome typical core size restrictions. The method relies on analysing the relationship between total core volumetric water content and RF concentration. Cores are packed with a mix of glass and RFs to maintain a uniform volumetric total clast proportion of 30% while RF concentration varies. A constant total clast volume improves accuracy and precision by ensuring the water‐holding characteristics of the matrix varies as little as possible among cores.