- 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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