In article ,
Lobster writes:
Tony Bryer wrote:
On Tue, 19 Feb 2008 16:39:18 -0000 Tmc wrote :
surprised to see next door take a delivery of ready mix this lunch
time for a conservatory base

It has not got above freezing today and the temp for tonight is -3

What effect will this have on the concrete?

None if it is covered up. Concrete generates warmth as it sets - a
major problem on massive structures like dams.

Yes, I went on a tour of the massive Hoover Dam near Las Vegas last
year; among the zillions of fascinating factoids thrown at us was one
that they when built it back in the thirties, they embedded the concrete
structure with miles of piping through which refrigerated water was
pumped, in order to keep the heat down and the project on schedule.

Driving up the M1 J7-J9 over last few cold months, several large
steaming new concrete structures can be seen on cold nights.

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]