Measuring the water retention curve of rock fragments: A novel repacked core methodology
Robertson, Balin B.; Gillespie, Julie D.; Carrick, S. T.; Almond, Peter C.; Payne, J.; Chau, Henry; Smith, Carol
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.... [Show full abstract]
Keywordssoil water retention curve; rock fragments; suction plate-core containment system; glass fragments; indurated greywacke sandstone; pumice; repacked core methodology; rock fragment water retention; water retention curve; Agronomy & Agriculture
Fields of Research370704 Surface water hydrology; 300201 Agricultural hydrology; 410699 Soil sciences not elsewhere classified; 370608 Petrophysics and rock mechanics
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