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I have a British house dating from the 1890s to 1940s - it was partially destroyed by a rocket in the war, so some bits are old and some are new. I am trying to identify the composition of an internal wall.

This is the wall in question:

enter image description here

Specifically I am trying to work out what the section of grey material is. The grey material seems quite hard: harder than mortar and approximately as hard as brick. It's about 30mm thick.

The overall thickness of the wall is about 180mm and the centre of the wall appears to a single layer of standard red brick.

Tetsujin
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Cameron
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    That looks a lot like concrete to me. – FreeMan Feb 04 '22 at 13:09
  • https://diy.stackexchange.com/questions/58826/old-brick-foundation-walls-125-years-need-repointing-and-or-plaster-finish-wh – Mazura Feb 06 '22 at 05:33
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    Probably lime based. Unless someone did some work in the last hundred years and they used portland where they shouldn't. You're supposed to take a sample somewhere... What's the objective here anyway? – Mazura Feb 06 '22 at 05:34

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It looks like it was rather fluid at one time. Maybe “grout”.

Lee Sam
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