Hg porosimetry determines the pore volume based on the volume of mercury injected into a specimen under increasing pressure. The volume of mercury that is pressed in directly gives the pore volume that is reached. With increasing pressures, smaller and smaller pore radii are reached. According to the Washburn equation (Washburn 1921) it is possible from this relationship to calculate - for a non-wetting fluid such as Hg - the reached pore size for each presure level an consequently a frequency distribution of the pore radii:
D = (1/P)*4γ*cosφ
where D is pore diameter, P is the applied pressure, γ the surface tension of mercury, and φ the contact angle between the mercury and the sample.
In September 2019 the Swiss National Cooperative for the Disposal of Radioactive Waste (NAGRA) commisioned Gesteinslabor with UCS, Brazilian and triaxial tests on neighbouring rocks of the Opalinus Clay - the rock which will host Switzerland's future facilities for nuclear waste disposal.
Gesteinslabor receives funding grant for the development of a novel test rig to determine capillary threshold pressure with hydrogen
Gesteinslabor receives funding from BMWi for the development of a new test rig. With this funding, our company will open up a new business field in renewable energies by implementing an innovative technology to determine the capillary threshold pressure with hydrogen on cap rock of underground gas storage facilities.