Concreting of various structures during the construction of buildings should occur subject to certain conditions. To obtain the design strength of the structure, a certain humidity, air temperature and time to achieve complete curing of concrete are required.
Construction technologies provide that concreting during the construction of buildings is possible only at an ambient temperature of +5 degrees Celsius and above. At lower temperatures, concrete will not be able to gain sufficient strength.
However, with the existing practice of construction work, it is not always possible to observe such conditions, therefore concreting is performed both in the summer and in the winter season. The problem is solved using modern technologies that allow pouring concrete at temperatures below +5 degrees.
After mixing the concrete mixture, chemical processes begin in it, during which it first sets, and then hardens. The flow rate of these processes directly depends on the ambient temperature. At +5 degrees, it decreases significantly, and at lower values it stops completely. Negative temperatures cause the water contained in concrete to freeze, which, expanding, destroys the internal structure of concrete. Ice also forms around gravel and reinforcing cage. It breaks the bond between them and the cement mortar, reducing its strength.
When the temperature rises to positive values, the curing process of concrete resumes, but after its completion, the structure becomes cracked, begins to delaminate and is completely destroyed.
For concreting in winter conditions, concrete must be uniformly heated to temperatures above +5 degrees Celsius. Uneven heating will lead to the formation of cracks and violation of the structural strength.
For heating concrete, various technologies and devices are used - heat guns, electric heaters or chemical additives. So, erecting large structures, use the thermos method. For this, the concreted area is covered with a thick plastic film or awning. Heat guns are placed inside the space to maintain a positive air temperature and reduce heat loss. In chemical processes in concrete, its temperature can rise to several tens of degrees. Thus, he warms himself up to complete curing.
-
Office decoration in the tradition of business New York
-
Which heaters are the most efficient and budget
-
How can designers profit from their clients?
-
Why is a robot vacuum cleaner useless?
-
How to hammer nails in order to never hit your fingers
-
What are the types of tow trucks and their functions
-
How to make perfect repairs in a short time
-
Top 3 best laminate flooring manufacturers
-
How not to combine a bathroom with a toilet
-
Why cheap porcelain tile is money down the drain
-
Storage of children's toys - creative ideas
-
What tricks you need to know when choosing a brick for the fence
New publications are published daily on our channel in Yandex. Zen
Go to Yandex. Zen
