winter. The mix you use during warmer months may not cut it when temperatures drop. For instance, concrete with a lower slump,( the consistency of fresh concrete before it’ s poured), freezes more slowly. Cold weather calls for a more specialized approach.
• Accelerators: Adding accelerators like calcium chloride can speed up the curing process, helping concrete gain strength before freezing temperatures set in. Be cautious though, as too much calcium chloride can lead to discoloration or corrosion in reinforced concrete.
• Lower water-to-cement ratio: Excess water can increase the risk of freezing, so opt for a mix with a lower water-tocement ratio. This reduces the likelihood of cracks and improves durability.
• Air-entrained concrete: This type of mix includes tiny air bubbles, which give the concrete room to expand when water freezes. It’ s a must-have for areas prone to freeze-thaw cycles.
• Hot water in the mix: Using heated water can help keep the concrete temperature high enough to kick-start hydration, even in cold weather.
Both you and your supplier should be aware of all of these elements, but ultimately it’ s on you to know what is needed and communicate it prior to delivery.
Monitoring and Adjusting Temperature
Once your concrete is poured, the job isn’ t over. In fact, it’ s just beginning. Keeping an eye on the concrete’ s temperature is still important to ensure it cures properly. Here’ s how to stay on top of it:
• Use insulated blankets or tarps: These are lifesavers for trapping heat and protecting the concrete from freezing temperatures. Cover it as soon as possible after placement.
• Set up heating systems: Depending on your project size, you might need portable heaters or heated
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