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Do you know the effect of low temperature on concrete?

Concrete has the characteristics of abundant raw materials, low price, simple production process, etc., and its uses are also very wide. At the same time, concrete also has the characteristics of high compressive strength, good durability, and a wide range of strength. These characteristics make it not only used in various civil engineering, but also in shipbuilding, machinery industry and other fields. Do you know the effects of low temperature on concrete?
Do you know the effect of low temperature on concrete?
The effect of low temperature on concrete:
1. The influence of low temperature conditions on the strength of concrete. Low temperature conditions will reduce the hydration rate of cement, thereby affecting the strength development of concrete.
2. The effect of low temperature conditions on the early performance of concrete has been proved through experiments: when pouring concrete, if the temperature is lower, the initial setting time and final setting time will be prolonged, and the temperature of the concrete will also be prolonged, and the subsequent setting time will be longer. obvious.
3. The influence of low temperature conditions on the frost resistance of concrete The frost resistance of concrete is related to the age of concrete during the freeze-thaw cycle, and the frost resistance of concrete is affected by the early stage. After multiple freeze-thaw cycles, there is no linear proportional relationship between the frost resistance of recycled mature concrete.
4. The influence of low temperature conditions on the volume stability of concrete. For concrete structures under low temperature conditions, the rate of decrease in surface temperature is significantly greater than the rate of decrease in internal temperature, which results in a greater temperature gradient and the resulting temperature stress. The tensile strength is not enough to resist the stress at this temperature, and irregular visible or invisible cracks will appear on the surface of the concrete.


Post time: Oct-28-2021