I am renovating a 1960s house and encountered a large hole in the aerated concrete block that's about 50 mm in diameter and maybe 35-40 mm deep that needs to be filled.

I would prefer to make it strong enough to drill and place an 8 mm plug there after the repair, but if that's not possible, just seal it so it will hold well.

I would rather not have to buy a whole bag of some "mortar" and would prefer a product "in a tube"...
 
The store didn't have that product but have tried with Casco Husfix and it seems to have worked well. Seems rock hard but haven't tried drilling yet...
 
Gypsum plaster is available in 5 kg bags. Otherwise, husfix works. Just make sure to wet the blåbetong first with a plant sprayer.
 
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It was suggested to wet in the instructions for house fix (for "absorbent materials" which I assumed applies to blåbetong).
 
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