Concrete construction in hot weather?

Concrete construction in high-temperature weather is a very special weather condition. Many details must be paid attention to in order to ensure personal safety while ensuring the progress of the construction. Zhongda Consulting will explain to you about concrete construction in high temperature weather.

High temperature weather does not only refer to summer. In spring and autumn, as long as the following conditions are met, it is also classified as high temperature weather: 1. High external ambient temperature 2. Low relative humidity 3. Strong sunlight exposure. When constructing concrete in hot weather, the main attention should be paid to controlling the slump loss of concrete before pouring and maintaining moisture after pouring.

Effects on the workability of concrete

Temperature has a great influence on cement hydration. The higher the temperature, the faster the cement hydration rate. The hydration rate of cement at 20 hours is 3 times as much as 5 o'clock. It is often difficult to accurately calculate the loss of concrete slump due to temperature. It is generally believed that for every 10% increase in concrete temperature, the slump loss will increase by 10mm to 40mm per hour. The rapid hydration of cement will cause the slump loss of concrete to accelerate and reduce the fluidity, which will bring adverse effects to concrete construction. The increase in temperature speeds up the evaporation of water and increases the bursting rate of bubbles in the concrete mixture, which will also lead to a reduction in the fluidity of concrete to varying degrees.

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