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The old pipes were under the floorboards, wrapped in a kind of 'wool felt' and loosely/partially buried in a fairly crumbly brittle 'concrete' (for want of a better word), which chiselled away easily with an SDS drill. Now I've laid the new pipes I need to replace the concrete. Any idea what it is or where to get it? I've still got the crumbled up remnant of what I chiselled out. Maybe I could mix that with something and put it back?