A private developer tries to carry out construction work in the warm season, but there are exceptions when some types of work must be done in winter.
Most often, the purpose of construction in winter is to hand over the building on time.
Construction work in winter involves high labor and financial costs. For example, concrete placement requires preheating. How to heat concrete with a PNSV wire will be discussed in this article.
The method of heating with a PNSV wire is used for outdoor work in the cold season.
Such actions are performed because at negative temperatures concrete does not gain strength well, that is, the water in the mixture simply freezes.
While the concrete hardens, further work is also suspended.
Even if concrete gains the required strength some time after hardening, there is a possibility that over time, the structure may crumble and collapse during further operation.
Concrete warming up occurs as follows.
When exposed to high temperatures, concrete will not swell, cracks will not appear after the concrete has hardened, there is no need to be afraid of this.
The hardening process will not be stopped by negative temperatures, due to the uniform heating of the concrete, it will harden as it should, and the structure will durable and reliable.
Concrete wire has its own characteristics.
The wire is laid at an air temperature of -25 to +50 degrees.
You need to calculate in advance how much wire you will need.
Presumably, about 55 m of wire goes for 1m3.
Heating of concrete with a PNSV wire in winter is completely safe, because such a wire is made with a good insulating sheath.
Due to the strength of the core, there is almost no possibility of kinking.
In no case should you connect the wire to the network until you immerse it in the concrete mixture, because this is fraught with burnout due to the increased current.
Heating of concrete with PNSV wire is used not only for domestic purposes, but also for industrial purposes.
For one cubic meter of concrete, we need about 55 m of wire. To find out how much wire you need, you need to find out how much concrete will be poured. Thus, for 20 m3 we need 1100 m.
There are some complex work to be done to install the cable.
After all the manipulations described above, fill and connect.
To connect the cable, it is necessary to bring it to a power source, and when connecting it is recommended to use a transformer.
After you have connected the cable, it is necessary to observe safety measures:
According to the recommendations of specialists, it is necessary to use stations for heating the following brands: "SPB-40 and SPB80".
Connect the wire in two ways: "Star" and "Triangle".
In the "Triangle" scheme, the wire cores are divided into three equal parts and the wires of each part are mated in parallel.
The sets that have formed must be connected in three nodes and connected to the three terminals of the station.
Before starting concrete heating, it is necessary to find out the warm-up time.
At first, the solution will be warmed up, and the temperature should not be increased by more than ten degrees.
The second step will be to raise the temperature by no more than eighty degrees.
The final stage will be the cooling of the concrete, but it is not worth lowering the temperature more than five degrees per hour.
Builders often have a question: "Can concrete be drilled immediately after it has hardened?"
This question can be answered positively, but several nuances must be taken into account.
You can cut concrete, but you don't need to shock.
When cutting, it is better to use a diamond tool.
If you use this tool, the hole in the concrete will have smooth edges when drilling.
Also, if you cut a hole in the concrete with a diamond bit, then at the moment when the bit reaches the reinforcement you will not have to change it.
The decision will only be yours. We hope our article was useful to you. Good luck
Posted By: Work Style |10, Nov 2020
Posted By: Work Style |08, Nov 2020
Posted By: Work Style |08, Nov 2020
Posted By: Work Style |02, Nov 2020