The last step of the emplacement work done in the Gas-Permeable Seal Test (GAST) was the construction of the concrete bulkhead which is designed to withold the 50 bars water pressure generated by the water injected into the sand/bentonite plug.

Gast experiment, grimsel : concrete plug construction
Closing of experiment

Gast experiment, grimsel :
Concrete mixing

Gast experiment, grimsel :
Concrete injection

Gast experiment, grimsel :
Concrete injection

Gast experiment, grimsel :
Final plug

Gas-Permeable Seal Test (GAST)