Insulating blankets are commonly used on
slabs, but may also protect formed
surfaces, such as this. To be effective,
insulation must be kept in close contact
with the concrete or surface of the forms.
freezing, and keep
it warm until it
reaches the desired
by Frank Randall
Cold weather makes special problems
for concrete placement, especially
when temperatures are below freezing.
As the temperature drops, the chemical
process that hardens concrete slows
down. At lower temperatures, concrete
sets up more slowly and takes longer to
reach a given strength level. If it freezes
at an early age, strength loss, increased
permeability, and reduced resistance to
weathering can result.
prevent damage caused by freezing at
protect concrete until it