What type of concrete

[Kris1]

Hello all professionals.
What type of concrete would you say this is?
The house was built in 51 with hollow blocks and wood. It has been remodeled a few times over the years and I'm wondering what type of concrete this is that I've encountered in two places.

 

[Mffnicke]

Looks like it might be blåbetong. Very common around the 1950s.

 

[Kris1]

Hmm, it doesn't look blue live, much grayer.
I don't think that wall was built in the 50s. It's probably later.

 

[Needas]

Probably slag stone!