Winter construction

When the daily average temperature is below 5 ° C, winter construction should be carried out and meet the following requirements:
1. Before grouting, measures should be taken to preheat the foundation surface, keep its temperature above 100 ° C, and remove accumulated water.
Before being frozen, the compressive strength of cement-based grouting materials shall not be less than 5MPa.

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Phosphine ester antioxidants are also commonly used, such as 2,4-di-tert-butyl ester. Aromatic raw materials such as biphenyl are affected by factors such as light, heat, oxygen, and moisture during storage and use, and their color may turn yellow. Chemical reactions may also occur to produce some non melting substances, leading to a decrease in their content. Adding antioxidants and anti-aging agents such as triphenylphosphine oxide, trinonyl phosphine oxide, and 2,4-di-tert-butyl phosphine oxide can reduce this phenomenon. The combination of phosphonates and substituted phenols can improve weather resistance and UV resistance. The above-mentioned phosphoester antioxidants are often used in combination with antioxidant 224, antioxidant 3 [4,4 bis (6-tert-butyl) 3-cresol], and other antioxidants, with better results.
Construction in high temperature climate environment
If the temperature of the grouting site is greater than 35 ° C, construction should be postponed according to the high temperature climate and meet the following requirements:
Measures should be taken 24 hours before grouting to prevent direct or other thermal radiation from the grouting area.
2. Take appropriate cooling measures, and the temperature of the concrete foundation and equipment base plate in contact with the cement-based grouting material should not exceed 35 ° C.
3. The injection temperature of the slurry should not exceed 30 ° C.
4. Moisturizing and curing measures should be taken promptly after grouting.

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In fact, it is unscientific to use phase change materials on exterior walls. Whether it truly contains phase change materials can be determined by the loss on ignition. If the loss on ignition of the material is less than 1%, it can be concluded that it does not contain phase change materials or has very little phase change materials and is of no use. The relationship and difference between phase change insulation mortar and phase change temperature regulating mortar: The function of the phase change mortar layer is to store energy and regulate indoor temperature. During seasonal changes, the temperature is high during the day and low at night, so the mortar layer can store a certain amount of heat during the day and release it at night, playing a role in energy conservation and temperature regulation.

The maintenance free construction conditions are as follows

When the construction temperature is above 5 ℃ and below 35 ℃, there is no need for maintenance after foundation grouting. If the temperature exceeds the range, the grouting material construction and maintenance methods should be followed for maintenance.

The external and internal insulation systems commonly used in construction projects currently have certain disadvantages in construction, such as easy cracking of walls and insufficient durability. Developing self insulation systems can avoid the disadvantages of these two systems, reduce project costs, and shorten project cycles. The development route of concrete (EPS) self insulating blocks. Concrete small hollow blocks have been used in construction projects in Huai'an City for nearly 2 years and are mature products. Therefore, self insulating block products can fully adapt to the current building system. As long as the thermal resistance of self insulating blocks can meet the mandatory 5% energy-saving standard of Huai'an City, they can be promoted and applied in buildings.