Quantification of Porosity Changes Due to Precipitation of Cement Materials with iCP

D. Sampietro [1], E. Abarca [1], M. Bayer [1], S. Jordana [1], J. Molinero [1], T. Tanaka [2], S. Hashimoto [2], T. Iwatsuki [3], H. Onoe [3], H. Saegusa [3]
[1] Amphos 21 Consulting, Barcelona, Spain
[2] Obayashi Corporation, Tokyo, Japan
[3] Japan Atomic Energy Agency, Gifu, Japan
Published in 2015

The Japan Atomic Energy Agency (JAEA) is carrying out an URL (Underground Research Laboratory) project in Mizunami city, central Japan. The project is a purpose-built generic URL project that is planned for a scientific study of the deep geological environment in fractured crystalline rock as a basis of research and development for geological disposal of nuclear waste. The concrete material using the URL construction is expected to be source of a hyperalkaline plume that can lead to porosity and permeability changes in the bedrock. In this study, a 3D reactive transport model, developed with the interface COMSOL-PHREEQC (iCP), shows the evolution of the hyperalkaline plume and evaluates the influence of porosity changes on the rock permeability.

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