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| Concrete Curing Period |
The curing
period must be designed so that the areas near the surface achieve the
structural strength and impermeability required for durability of the concrete,
and corrosion protection of the reinforcement.
Strength
development is closely connected to the concrete composition, fresh concrete
temperature, ambient conditions, concrete dimensions and the curing period
required is influenced by the same factors.
As part of
the European standardization process, standardized European rules are being
prepared for concrete curing.
The
principle of the European draft is incorporated in E DIN 1045-3. Its basis is
that curing must continue until 50% of the characteristic strength fck is
obtained in the concrete component. To define the necessary curing period, the
concrete producer is required to give information on the strength development
of the concrete. The information is based on the ratio of the 2 to 28 day
average compressive strength at 20°C and leads to classification in the rapid,
average, slow or very slow strength development range. The minimum curing
period prescribed according to E DIN 1045-3 is based on these strength
development ranges. The table below shows the minimum curing period as a factor
of the strength development of the concrete and the surface temperature.
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