Cold Weather Concrete

sidewalk-350

Non Chloride Accelerator

Is a non-corrosive, non-chloride admixture. It accelerates hydration, which results in shorter setting time and increases early compressive strengths. This is often used during cold winter-weather concrete placement. This additive is added at the plant during batching.

Calcium Chloride

Acts the same as a non-chloride accelerator but it is not recommended for use where there is reinforcing steel, metal decks or electrical conduit. This additive is added at the plant during batching.

Hot Water

Hot water is added at the plant during batching when cold weather is present. Hot water accelerates set up time and strength. Cold weather concrete usually starts during the fall and continues until spring. Cold weather is defined as a period when, for more than 3 consecutive days, the following conditions exist: 1) the average daily air temperature is less than 40 degrees F. 2) the air temperature is not greater than 50 degrees F for more than one-half of any 24-hour period. The average daily air temperature is the average of the highest and lowest temperatures occurring during the period from midnight to midnight.