Cold Weather Concrete
Cold Weather Concreting
Below are valuable aritcles and publications on Cold Weather Concreting:
- COMPLETE Cold Weather Packet
- Letter from Cemstone Engineering Services 2016
- NRMCA CIP 27 Cold Weather Concreting
- Concrete Construction - Cold Weather Concreting
- Curing & Sealing Guidelines
- Resource Guide
- Extreme Cold Weather Policy- Ready Mixed Concrete
- Extreme Cold Weather Policy - Concrete Placing Services
- Exterior Concrete Maintenance Guide
- ACI306 Cold Weather Tips
The following information will help you successfully place concrete in cold weather. As always, Cemstone is committed to our mutual success and following these guidelines will result in satisfied customers.
Special precautions are needed for placing concrete in cold weather conditions. Cemstone uses heated mixing water and if needed, heated aggregates to keep concrete temperatures at the time of batching above 60°F in cold weather.
The slider below explores ten items that will help prevent cold weather concrete issues.
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#1 In dry conditions, it is critical to maintain concrete temperatures for at least the first two days or
until the concrete obtains a compressive strength of 500 psi with the use of thermal blankets,
#2 In wet conditions, it is critical to maintain concrete temperatures for at least the first week or
until the concrete obtains a compressive strength of 3500 psi with the use of thermal blankets,
#3 Minimize rapid temperature changes, particularly before the concrete has developed sufficient
strength to withstand thermal stresses which can cause cracking.
#4 When early strength is needed, use thermal protection or heat enclosures to maintain curing
temperatures above 50°F.
#5 The use of accelerating chemical admixtures are recommended during cooler temperatures to
increase the speed of hydration and mitigates free water from freezing.
#6 Frozen sub-grade can cause the concrete to freeze as well as cause soil expansion and
contraction issues to arise in the spring.
#7 Cylinders must be cured according to ASTM C 31 which specifies initial curing within 60 to 80
degrees F (cure boxes, blankets or other curing methods must be used in order to comply with
ASTM specifications). ASTM C31 also requires that cylinders must be initially cured in an
environment free of evaporation and stored for no longer than 48 hours prior to being taken
to the laboratory for final curing.
#8 Cold weather concrete should be placed at the minimal slump that can still be effectively placed.
High range water reducers can be used if higher workability is desired, and prevent the loss of
strength due to high water/cement ratios.
#9 Proper curing procedures must be followed immediately after finishing is completed. Please see
Cemstone's Concrete Flatwork Guidelines for more information.
#10 Place barricades so that traffic will not be allowed on the concrete for a minimum of 7 days or
until the concrete has obtained the compressive strength specified to open for traffic. High-early
strength mixes and accelerators can be used when high earlier strength is needed.
If you have any questions or concerns please feel free to contact your Cemstone Representative.