Material selection specification in cold storage design

Material selection specification in cold storage design

In addition to heat insulation and moisture-proof materials, cold storage design materials include bricks, stones, cement, concrete, mortar, steel bars, and wood. Most of the building materials used in cold storage are in a low-temperature and humid environment, so the cold storage design materials used have special requirements for frost resistance and water resistance. The following editor will share with you about the material selection specifications in cold storage design:

1. When bricks and stones are used on the outer wall of the cold storage, the label shall not be lower than MU7.5, and the frost resistance level shall not be lower than 25; if used for the lining wall or inner partition wall of the low temperature storage, the label shall be not lower than MU10 , The antifreeze level is not less than 35;

　　 2. Ordinary Portland cement has better frost resistance, so ordinary Portland cement should be preferentially used for structural parts in cold storage rooms and freezing rooms. This is because slag cement has better freeze resistance;

　　 Third, the cold storage is always in a low temperature state, therefore, the moisture in the foundation of the cold storage is easy to freeze. This results in the expansion of the land volume, causing serious deformation of the entire building structure, making the cold storage unusable. For this reason, cold storage design materials must have good heat insulation to ensure that the floor is not affected by low temperatures.

4. The cold storage design code stipulates: Generally, the concrete mark of cold room is not less than C20, and the water-cement ratio shall not be greater than 0.6; the concrete mark of the freezing room shall not be less than C30, and the water-cement ratio shall not be greater than 0.55. Small water-ash will cause construction difficulties and poor formability , It is not easy to be compacted, with many pores and more water filling. The greater the water-cement ratio, the more voids in the concrete. The test results prove that the frost resistance of concrete with a water-cement ratio of 0.55 to 0.6 is the best

　　Because of working under low temperature for a long time, especially its periodic freezing and thawing, the building structure is vulnerable to damage. Therefore, the cold storage design materials must have relatively good anti-freezing ability to prevent various unfavorable cold storage operations.