5 Jan
2002
5 Jan
'02
4:49 a.m.
On Fri, 4 Jan 2002, Lawrence Walker wrote:
Asphalt when subjected to low temperatures will
buckle when temperatures
get milder. Likely the reason most main roads out here on the Canadian
prairies are laid in cement slabs with a space between them.
Lawrence
<snip>
... So that the whole slab tips when the water that enters the space
freezes. Some of us older folks remember when Canada's approach to
frost heaving was gravel roads - much easier to repair!
- don