Cold Weather Concrete Recommended Tips

- Sep 21, 2018 -


Follow these recommended steps to assure that concrete in cold weather will obtain the required design strength and that you don't have any other issues while the concrete is setting.

·         Prior to pouring, define the strategies that will be used including materials, forms, testing and other requirements.

·         Schedule and determine the cold weather protection measurement of the concrete mix.

·         Keep a well-defined temperature record chart including concrete temperature and exterior temperature.

·         Never pour concrete over frozen ground, snow, or ice. Use heaters to thaw the ground before pouring concrete.

·         Determine if special considerations and strength requirements must be met; if so, protect concrete at specific temperatures.

·         If heated enclosures are going to be used when placing concrete in cold weather, be sure to know that they must be windproof and weatherproof.

·         If combustion heaters are used, vent outside to prevent carbonation.

·         Cold weather concrete should have the correct amount of air entrained voids that will resist freezing and thawing effects.

·         Concrete in cold weather is recommended to have a low slump, and minimal water to cement ratio, to reduce bleeding and decreases setting time.

·         Use concrete curing blankets to prevent freezing and keep the concrete at an optimal curing temperature.

·         Use insulation blankets or heated enclosures to maintain concrete temperatures above 50° degrees Fahrenheit for three to seven days.

·         Do not begin final finishing operations while bleed water is present.

·         Request a heated mix or order 100 lbs. of extra cement for each cubic yard of concrete. This extra cement helps develop early strength.

·         Fresh concrete frozen during the first 24 hours can lose 50% of its potential 28-day strength!

·         Maintain the concrete temperature above 40° degrees Fahrenheit for at least four more days after the use of the insulation blankets or heated enclosures.

·         Be careful!! The concrete temperature cannot drop more than 40° Fahrenheit in 24 hours.

·         When there is no other option, adding a cement bag to the mix will help.

·         Do not seal freshly placed concrete until it has bleed and the setting process has begun.

·         It is recommended to place concrete as soon as possible, if the batch plant is too far from the concrete’s final destination, additional steps must be taken to reduce setting problems.

·         Hot water heaters might not be able to withstand hotter temperatures after the initial batches.


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