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\begin{document}

\title{Utilizing Heat of Wetting to Estimate Physical Properties of Tuff}



\author[1]{Kristopher Kuhlman}%
\author[2]{Forest T Good}%
\author[1]{Melissa M Mills}%
\author[1]{Matthew J Paul}%
\author[3]{Jason E Heath}%
\author[4]{Tara Laforce}%
\author[1]{Brittney D Seaburn}%
\affil[1]{Sandia National Laboratories Nuclear Waste Disposal Research \& Analysis}%
\affil[2]{New Mexico Tech}%
\affil[3]{Sandia National Laboratories Geomechanics}%
\affil[4]{Sandia National Laboratories Applied Systems Analysis \& Research}%


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  \date{May 19, 2024}


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\begin{abstract}
During characterization efforts of complex sites and geologies, it is
important to estimate material properties efficiently and robustly. We
present data and modeling related to the heat of wetting process during
spontaneous imbibition, as observed in zeolitic tuff. The heat of
wetting is due to adsorption of liquid water and water vapor to an
oven-dry core sample and results in an observable temperature rise. The
fitting of numerical models to imbibition observations allows
simultaneous constraint of single-phase (porosity, permeability),
two-phase (van Genuchten m and alpha), thermal (thermal diffusivity),
and transport (tortuosity) properties from a single imbibition test.
Petrographic analysis informs how microstructure connectivity and
pore-lining phases affect the imbibition process. Estimating multiple
properties simultaneously from a single test on a core sample helps
ensure consistency in interpreted material properties. SNL is managed
and operated by NTESS under DOE NNSA contract DE-NA0003525
(SAND2023-07021A).%
\end{abstract}%



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