On 20/03/2021 10:32, Steve Walker wrote:
On 19/03/2021 14:45, Harry Bloomfield wrote:
NY expressed precisely :
I remember when major roads like the A34 between Oxford and the M40
were made up of concrete slabs, with tar expansion joints. Not a nice
road surface to drive on - very hard (tarmac is hard, but there's a
bit more give in it) and the thump-thump-thump of each joint gets
very annoying after a few seconds ;-)

..and noisy. The built a motorway a few years ago in concrete, one
mile away. A petition soon had it resurfaced in tarmac.

Years ago ('80s or '90s IIRC) they demonstrated laying concrete as a
continuous slab and, when it had set, but not hardened, microcracking
it. It gave space for expansion, so no need for expansion joints
(although simply angling those or making them V shaped will do away with
the regular jolts and noise) and did away with the need for grooving the
road surface for water dispersal (and the irregular surface meant no
drone - just like tarmac). Unfortunately I never heard anything about it
again.

This?

https://www.roads.org.uk/blog/diamond-rough

--
Adam