Pouring, setting, finishing, and curing concrete can be a very delicate process contingent on environmental factors. Temperature, humidity, and surface conditions are critical elements in ensuring that concrete sets and cures properly. When extreme weather and other environmental issues come in to play, concrete manufacturers must employ special techniques to avoid cracking and crusting, while also ensuring that the concrete develops the proper strength necessary for its desired purpose. Because of the additional planning, the likelihood of extra costs, and the added investment in materials, companies must decide whether pouring concrete in cold weather conditions makes sense overall and is a worthy investment.
At MCR Safety, we understand that being prepared is key to successfully working with concrete in the winter months. Part of that preparation rests around knowing what employee gear will be needed at a jobsite and which safety gear is critical to avoiding any wasted time. In this article, we will highlight concrete winter pouring and the safety gear one will need, making you prepared for your next winter job.
Before a job even gets started, developing strategies for pouring, temperature control, and testing are essential. Many manufacturers keep temperature-recording charts, which manage the temperatures of the concrete itself. This temperature recording is on top of external temperatures. In addition, utilizing a schedule in conjunction with weather reports can be very helpful in keeping up with the protection and maintenance of the concrete temperature.
It is important to take into consideration the specific type of concrete you are working with and whether it requires any special considerations to develop the strength requirements. Experts recommend that concrete poured in cold weather should have a specific amount of air entrained voids to resist freezing and thawing issues. In our article, “An Overview of the Concrete Manufacturing Process,” we highlight the different concrete types.
In order to effectively manage pouring concrete in cold weather, concrete companies must have a thorough understanding of hydration, also commonly known as the curing process. This process is a chemical reaction that must take place in order for concrete to hold up over time and to develop the appropriate strength and durability. Because temperature affects the rate at which concrete sets and affects how these chemical reactions take place, the concrete itself must be kept at = 40ºF (=5ºC). Concrete curing at less than 40ºF (5ºC) can completely halt the hydration process, which may cause freezing and ultimately lead to cracked concrete.
Guidelines for temperature management, as well as placement and protection of concrete in cold weather are established and mandated under the Guide to Cold Weather Concreting - ACI 306. Contrary to popular belief, the guide suggests that if managed properly, concrete set in low temperatures can be more durable in the long term than concrete set in higher temperatures.
The Guide states, “Concrete placed during cold weather, protected against freezing, and properly cured for a sufficient length of time, has the potential to develop higher ultimate strength (Klieger 1958) and greater durability than concrete placed at higher temperatures. It is susceptible to less thermal cracking than similar concrete placed at higher temperatures.”
Some recommendations for maintaining the right temperatures to achieve these results:
Clearly, due to the delicate nature of managing cold weather concrete production, extensive planning is involved in managing concrete temperatures to ensure proper curation.
Although working with concrete in cold temperatures can be tricky, it is not impossible. Here are some basic tips for working with concrete in cold temperatures.
Preparing employees for cold weather conditions is equally as important as preparing for different materials and environmental factors. The more comfortable employees are, the more focused they can be on their work. Best practices for working in extreme weather conditions include:
Cold and wet weather conditions are a liability disaster for employers managing employees working in these conditions. The best way to manage these risks is to invest in the right equipment to ensure employees are safe and comfortable. In our article, “How to Choose the Right Insulated Gear for Concrete Production,” we cover the basics of selecting the appropriate gloves and body gear for laborers managing production in the colder months. We emphasize the importance of selecting the right gear because frostbite can occur in extreme temperatures.
One of MCR Safety’s most popular insulated glove is the Ninja Ice, which comes in a variety of coated options, such as fully coated, ¾ coated, and palm coated. The Ninja Ice is great because its coating repels water, a nice feature in wet and cold conditions!
We highly recommend that any employer looking for concrete production safety gear for use during cold winter months register for The MCR Safety 360° Protection Program and schedule a thorough assessment of their safety gear needs.
Be sure to also check out our insulated information covering a full range of insulated safety gear options.
For more details on MCR Safety’s cold weather gear for concrete production you can request a catalog, find local distributors, or give us a call at 800-955-6887.
Choosing the right gloves is a critical safety step. This is even more true for concrete workers.
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