Concreting temperature is a much discussed topic in large construction projects with comparatively large sized components.
It is very important to examine the evolution of concrete temperature over time after mixing. It is important that the civil engineer and construction team know this information to avoid possible risks.
- Internal cracks in concrete
- Surface cracks
- Formation of delayed ettringites
Above are some of the problems that need to be avoided in a structure. Therefore, we need to limit the temperature rise of the concrete. The article “ Methods for Limiting the Temperature of Concrete For more information on the above topic, see “”.
Before we talk about the concreting temperature, let's see
Why do we need to lower the temperature when pouring concrete?
We know that the temperature of concrete during the hydration process increases with time after mixing. Thicker concrete may take 2 to 3 days to reach maximum temperature.
As a general rule, we try to limit the maximum possible temperature rise to 70.0 C. This is done according to the procedure described below.
- If thicker concrete needs to be poured, a marking test is performed.
- Before starting the project, a concrete cube measuring 1 mx 1 m or more is cast.
- The formwork corresponds to the structure to be built.
- Temperature development is monitored and checked to see if it is within the permitted range.
- Otherwise, the fly ash content must be changed or added ice, cooling water, refrigeration units, etc., to meet the temperature limits.
As mentioned above, the purpose of adding ice and chilled water to concrete is to ensure that the pouring temperature is as low as possible.
Let us now look at the values specified for the concrete placement temperature and the monitoring methods.
Concrete temperature limit best temperature for concreting
The new standard BS 8500-2-2015+A1:2016 provides detailed information on this topic.
According to the guideline, the installation temperature must meet the specification or 35 0 C
Therefore, the value specified in the standard is not normally used, but rather the value specified in the project specification, as this value has a significant influence on the Durability of the concrete .
