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01
Oct
So you want to cure concrete but it's freezing cold outside. You have a project that can't be delayed any longer but the ground is frozen. You need to keep your work crews working, but temperatures are sub zero. Sound familiar? The list of reasons for concrete work stoppage and scheduling delays can be endless.
Luckily, cold weather and freezing temperatures no longer need dictate your work schedule. New technologies engineered specifically for the construction and concrete industry are changing the way contractors work in cold weather.
So first, let's start with a few basics... Cold weather concrete can be classified as a period of more than three days where some specific conditions occur under certain temperatures. For example - The American Concrete Institute defines that concrete will be exposed to cold weather when the following conditions exist:
* The average daily air temperature is less than 5°C (40°F)
* The air temperature is not greater than 10°C (50°F) for more than one-half of any 24 hour period
* The air temperature is not greater than 10°C (50°F) for more than one-half of any 24 hour period
So when concrete is being managed under these conditions, it must be protected from freezing shortly after being poured. All concrete must be protected from freezing until it has reached a minimum strength of 500 pounds per square inch (psi), which typically happens within the first 24 hours. Standard insulated curing blankets may be sufficient when your dealing with temperatures close to these thresholds... but when the mercury drops well below freezing, standard blankets won't cut it. And the lower the mercury drops, the greater the need for a curing solution that produces heat. In no case should concrete be allowed to freeze during the first 24 hours after it has been placed. Since cement hydration is an exothermic reaction, the concrete mixture produces some heat on its own. Protecting heat from escaping the system using polyethylene sheeting or insulating blankets may be all that is required for good concrete quality. More severe temperatures will require supplemental heat (CureMAX or Powerblanket electric curing blankets) which allow for a wet cure. Heated enclosures are netorious for drying out new concrete.
The goal is to produce a quality product, with maximum PSI levels in as short a time as possible WITHOUT adding harmful additives and hardeners. The solution is Insulated Curing blankets with an electric heating element (when possible). There are a few manufactures who make these special construction covers... names like Powerblanket, Curemax, and RapidThaw (for hi-heat application where the ground must be thawed quickly prior to pouring). Engineered specifically for cold, wet, freezing environments... these manufacturers produce some of the best curing and thawing solutions available to the market. ETL certified to UL/CSA safety standards, welded seems to keep moisture away from the heating element. rip-stop vinyl for rugged outdoor applications, and GFI plugs for maximum safety. Check 'em out, you won't be disappointed. Curing and thawing technology for a new generation of builders. Cure concrete in any weather condition (hot or cold). Wet cure the concrete without drying it out. Won't cause effloresence or misscoloring of concrete. Produces maximum PSI levels, up to 3x faster than using standard insulated concrete blankets. Call today for pricing and availablility.
Heat Authority
