When is the temperature control of the concrete mixture needed?

The temperature of the concrete mix is ​​a key factor affecting quality and strength. Temperature control is most required during winter. At low plus and minus temperatures, the concrete mix needs special attention. In addition, it is necessary to control the temperature of the concrete mixture at elevated positive temperatures. So, for example, without the appropriate temperature, the strength of concrete is achieved much more slowly. Let's consider this issue in more detail.

In winter, when mixing the concrete mass, the temperature of the initial elements and the resulting mixture should contribute to high-quality mixing. This is especially true for situations where average daily temperature street air goes down below five degrees, a the minimum daily temperature drops below zero degrees. Also, during the cold period, the concrete structure should be insulated.

It is necessary to control the temperature loss of the mass during further movement of the mixture and molding. The temperature after these processes should, under the circumstances of the hardening method used, help heat the concrete.

During a warm period at high positive temperatures it is important to avoid a decrease in the mobility of the mass and due to excessive heating. If the concrete in monolithic structures has been overheated, then urgent measures must be taken to reduce the temperature gap. In large monolithic structures, it is also necessary to reduce the influence of temperature moist stress fields, which imply heat generation during the solidification of the mixture. The total surface heating temperature should not exceed 25 degrees. The concrete mass itself should have a temperature of no more than 30 degrees.

Both in the cold season and in the hot season, the surfaces of the hardened concrete mixture must be covered with vapor barrier or thermal insulation. This is done immediately after the completion of concreting.

It is advisable to perform electrode heating until the mixture reaches no more than 50 percent of a certain strength. If the established strength exceeds this indicator, then the future curing of the mixture must be carried out by the thermos method. In this case, the frequency of temperature measurement will be twice a day until the end of the hold.

It is also necessary to control the temperature to protect the mixture from drying out during electrode heating, as well as to achieve temperature uniformity with low electricity consumption. In this situation, strong thermal insulation or moisture insulation of the mass is required.

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