No. It was a controlled fracturing of the uncured concrete surface, carried out during construction. I can't remember where I saw it, but it was likely Tomorrow's World or something similar.
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3 years ago
Side road resurfacing
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3 years ago
Where I live, we had well laid roads but, because building of other properties continued, the final surface was not laid until a few months back it was the subsurface. Thus the lowered kerbs, ironworks, etc., presented a bit of a lump and required care.
They have now done the final surface, a lovely job in fine tarmac.
But the oddity is that I use a wifi relay and, since the final surfacing, it has improved transmission - from typically about 90% to almost always 100% as the unit shows. No other changes at all.
No relevance to anything else. Just my observation.
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3 years ago
They used to lay triangular section strips of wood transversely under where the concrete would be poured, plus (I think) rubber strips on top of the concrete. The latter would be stripped out and pitch (or similar) poured in to seal the joint after the concrete set. As the concrete set it would contract leading to a rough joint. There were longitudinal steel rods in cardboard tubes to stop the slabs from tilting.
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3 years ago
No, not quite that one either. It involved a weight being used to cause random cracks throughout the entire surface, leading to the noise, and drainage advantages of tarmac, along with the long-life and wear resistance of concrete.