When pouring concrete and curing concrete, weather is always a factor that needs to be considered. The seasonal changes in climate that are experienced in the Midwest need to be examined and figured into the process – the hot and humid summers, cool falls, cold winters and damp springs. When pouring concrete in cold weather, our concrete blankets can facilitate good results when used correctly.
Once you make sure that you have the right concrete mixture for the weather you will need to find a method of protection for the surface. Traditionally one of the most efficient ways to provide protection for flatwork is to shield the area with blankets once it is finished. Since the concrete will generate heat and the ground is warmer, a blanket will maintain its warmth even though the temperature drops below 20 degrees Fahrenheit.
At Steffen’s rental we can help you with Concrete Blanket Rentals in Northern Kentucky, Cincinnati and the surrounding areas including Southern Indiana. Along with renting a concrete blanket there are many things you need to consider before, during and after pouring concrete in cold weather.
When pouring your concrete it is important to remember the rule – if the temperature of the atmosphere is below or anticipated to go under 40 degrees Fahrenheit, you should use the cold weather methods. In cold weather, you will need to wait for all the water to evaporate. Some of this water is called bleed water and will contain the particles of concrete settling and squeezing out all of the excess water. If that water is finished into the surface, the water to cement ratio increases and weakens the surface concrete. In the cold, the concrete will settle more slowly, so “bleeding” starts much later and will last longer.
If your concrete is warmer than 50 degrees Fahrenheit you will probably only need to keep the blankets on for a few days. You can check the temperature of the concrete by using maturity methods or using an infrared gun. The maturity method helps you to determine if your concrete has enough strength – it uses a combination of temperature and time.
Concrete Blankets Rentals
When trying to figure out the amount of insulating value that you will need to maintain a temperature of 50 degrees Fahrenheit you can use the tables that are provided in the ACI 306. The level of insulation required can be determined by the cement content, thickness and the lowest air temperature that is expected during the period.
It is a good practice to place several layers of blankets at the edges and corners because they could freeze. Ensure that the blankets will not blow off by securing them in some manner.
Keeping the concrete temperature around the 50 degrees Fahrenheit mark, will allow the blankets to be able to be removed after 2 days. If your concrete stays at 50 degrees Fahrenheit, it is recommended that you do not use the surface of the concrete for at least a few weeks. It is also suggested that you test the surface to determine that the strength is sufficient for use.
When removing the blankets do not remove them too suddenly, as this can cause the temperature difference between the outside and the middle of the concrete to build up. This can result cracking, however this usually only occurs when the members are thicker.
When concreting in colder weather there are many factors to take into account to make sure that your project is completed successfully. When looking for a concrete blanket for rent, we can help you at Steffen’s Rental.