In addition to the two large-scale tests, FEBEX has an associated laboratory program, which includes basic characterisation and thermo-hydro-mechanical and thermo-hydro-geochemical testing. Although the determination of certain basic parameters requires new testing techniques and methods, the last two groups involve the greatest experimental innovation.

Swelling pressure measurements were performed using conventional oedometers on samples saturated with distilled water. A regression curve was developed as a function of dry density for the swelling pressure of the FEBEX bentonite.

Swelling pressure as a function of dry density

Swelling pressure measurements were performed using conventional oedometers on samples saturated with distilled water. A regression curve was developed as a function of dry density for the swelling pressure of the FEBEX bentonite.

Saturated hydraulic conductivity as a function of dry density

Full-scale High Level Waste Engineered Barriers (FEBEX)