Be prepared to handle more bleed water than is typical in regular concrete placement. Concrete poured and placed in cold weather has a much slower setting and curing time, so bleeding will also start later than expected. Wait until all bleed water has evaporated before finishing.Live steam can be pumped into the enclosure around the concrete to prevent it from drying out too quickly in the low-humidity levels that are common during cold weather.Corners and edges are most vulnerable and forms will help during the heat release process. Where forms are used, leave them in place as long as possible since they will retain heat and help prevent the concrete from drying too quickly.These materials set up more slowly and generate less internal heat. Avoid using fly ash or slag cement in cold weather.This is important because high moisture content can induce corrosion problems in steel reinforcement. Use Portland cement Type III, cement that helps in setting without reducing the concrete’s quality.Most commonly, this involves increasing the ratio of cement content in the concrete, or using an accelerating chemical admixture, such as calcium chloride in ratios as high as 2%. The mixture components may need to be adjusted.On-site mixing of small amounts of concrete may involve using hot water or keeping the aggregate stored in warm indoor locations before mixing. Ready-mix companies may have this capability generally, the concrete leaves the plant in trucks at about 65 degrees Fahrenheit. Rather than heating the Portland cement, this is done by heating the water and/or sand and gravel before mixing. During cold weather, preheating one or more of the constituent materials (the water and the aggregate) can ensure that the proper concrete temperature is present during the pour.

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