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| Fresh Concrete Temperature |
The fresh
concrete temperature should not be too low, so that the concrete gains
sufficient strength fast enough and does not suffer damage from frost at an
early age.
·
The fresh concrete temperature should not
drop below +5°C during placement and installation.
·
The freshly placed concrete should be
protected from frost. Freezing resistance is reached at a compressive strength
of approximately 10N/mm².
·
On the other hand too high concrete
temperatures can result in (cause) placement problems and decline of certain
hardened concrete properties. To avoid this, the fresh concrete temperature
should not go above 30°C during placement and installation.
Precautions
at low temperatures
The concrete
should be protected from rain and frost during handling. Concreting is only
possible in freezing temperatures if special protective measures are taken.
They must be in place from the start of concrete production to the end of
curing.
They depend
on the outside temperature, air humidity, wind conditions, fresh concrete
temperature, heat development and dissipation and the dimensions of the
concrete pour.
The fresh
concrete must not be colder than +5°C during placement and installation without
additional protective measures. The mixing water and aggregates should be
preheated if necessary.
Precautions
at high temperatures
The concrete
should be protected from drying out during handling.
Concreting
is only possible at high temperatures if special protective measures are
provided. These must be in place from the start of concrete production to the
end of curing. They are dependent on the outside temperature, air humidity,
wind conditions, fresh concrete temperature, heat development and dissipation
and the dimensions of the pour.
The fresh
concrete must not be hotter than +30°C during placement and installation
without these protective measures.
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