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.

--
Tony Bryer SDA UK 'Software to build on' http://www.sda.co.uk