It uses the heat obtained by heating raw materials (except cement) or concrete and the hydration heat of cement, and then covers the concrete structure with thermal insulation materials to prevent the internal heat from dissipating too quickly, thus delaying the cooling speed of concrete and improving the strength of concrete above the critical freezing strength at room temperature.
Extended data
A, the construction control points
1, the heat storage method is the simplest method in winter construction at present, and it is suitable for the environment where the outdoor average temperature is above 15℃. For the parts of the structure that are easy to freeze, measures should be taken to strengthen thermal insulation.
2. The thermal insulation materials used in the thermal storage method should be local materials with low thermal conductivity and low price.
Thermal insulation materials must be dry, so as not to reduce thermal insulation performance. Soft plastic film is a widely used maintenance and insulation material, which has a small air permeability and is suitable for covering any shape of components.
3, temperature measurement. Temperature measuring holes shall be set at proper positions of members, and the temperature shall be measured at least four times a day, so as to master the development strength of concrete and prevent concrete from being frozen at an early stage.
4. Thermal storage method is often used in conjunction with antifreeze additives and additives with water-reducing and air-entraining functions to expand the application scope of thermal storage method.
Second, the applicable conditions
1, when pouring mass and underground concrete, the heat storage method has the best effect. However, when fast-hardening arsenate cement and high-efficiency thermal insulation materials are used, especially when the weather is not too cold, the heat storage method is also suitable for concrete construction with medium volume structure.
2. For general construction projects, when the surface coefficient of concrete and reinforced concrete blocks is not more than 5, the daily average temperature is above-10℃ and the daily minimum temperature is not lower than-15℃, the heat storage method is also applicable to underground structures.
3. The larger the size of concrete structure, the less exposed surface and the greater the heat storage. Therefore, the cooling time to 0℃ is longer. In mass concrete, the cement releases a lot of heat after concrete pouring, which can keep a high temperature for a long time. Therefore, it is most suitable for mass hydraulic concrete and piers.
Reference: Source 0: Baidu Encyclopedia-Concrete Thermal Storage Method