The pre-mixed sand/bentonite material for the GAST (Gas-Permeable Seal Test) experiment at the Grimsel Test Site is emplaced and compacted with different methods to ensure correct emplacement around the fragile instrument assemblies. (photos Comet)

Emplacement of pre-mixed S/B material

Distribution of S/B material

Compaction with Wacker hammer

Compaction with vibration plate

Gas-Permeable Seal Test (GAST)