Found this weird lump in my concrete wall, the plaster around has crumbled off, any ideas as to what this may be??

[PHWX]

 

[bobski]

I think they're like a lignacite block. There was a reaction that happened once the cement/lime in the render touches it. It expands then blows out. A whole estate near me has this problem. I think a 60's or 70's estate.

 

[smoother09]

If you’re finding any kind of lump my advice is go doctors immediately! Ya can’t mess around with these things

 

[essexandy]

Looks like a piece of cat shite that would often be in the sand and cement.

 

[bobski]

Looks like a piece of cat shite that would often be in the sand and cement.

Yes, but these are/were in the blocks themselves.

When you look close, its like small carbon or black soot or Ash. It reacts and blows out when rendered over. Probably organic or something.

 

[tapit]

Decomposed smurf

 

[Monkey Boy]

You find strange bits in blocks but usually tiny bits. Is that magnetic? Could be a meteorite? Landed in block mixer lol

 

[choppa]

View attachment 50488

Looks like a bit of comet.

 

[zombie]

Is it wrong that I dont care

 

[puddove]

is it cannon ball