After Russia pledged to scale back its military operations around Kyiv and in northern Ukraine, the prices of most industrial metals fell, led by aluminum, showing people's concerns for supply shortage eased.
At an earlier time, the West imposed sweeping sanctions on Russia for its invasion of Ukraine, which aroused concerns about the supply problem because Russia is a major producer of nickel, aluminum, and copper.
Russia is also a major gas supplier to Europe, where potential supply disruptions are seen as hitting power-intensive aluminum and zinc concrete foaming agent are still very uncertain.
Foam concrete natural maintenance can be divided into two types: cover-up sprinkler maintenance and plastic film maintenance.
Cover-up sprinkler maintenance:
It is that according to the external temperature, the concrete should be covered with appropriate data such as grass curtain, Reed mat, sack, sawdust, wet soil and wet sand within 12 hours after the end of foam concrete pouring, and often sprinkle water to keep it wet.
Foam concrete sprinkling maintenance cycle: for Portland cement, general cement and slag cement mixed concrete shall not be less than 7 days and nights; concrete mixed with slow setting admixture or impermeable request shall not be less than 14 days and nights; when using bauxite cement, not less than 3 days and nights. The frequency of watering every day has been able to insist that the concrete has a satisfactory wet condition. When the temperature is above 15 °C, the concrete should be sprinkled at least once every 3 hours during the day and twice at night when the concrete is poured. In future maintenance, sprinkling water at least 3 times a day (of course, when the temperature is dry, the frequency of watering can be appropriately increased).
For large area (or volume) concrete, we should choose "water storage maintenance". Projects such as storage tanks can be maintained by sprinkling water after the internal mold is removed and the concrete reaches a certain strength; with regard to the underground structure or foundation, it is possible to paint asphalt emulsion or backfill with soil instead of sprinkler maintenance.
Plastic film maintenance:
It refers to the use of plastic film cover material to separate the concrete from the air, water is no longer transpirated, cement depends on the moisture in the concrete to complete the hydration effect has reached condensation hardening.
This method can directly cover the plastic draft on the appearance of the concrete, or spray the plastic emulsion on the instant noodles of the concrete members, and wait until the emulsion is transpirated, and then combine into a layer of plastic film on the surface of the concrete to block the concrete members from the air, so that the moisture in the concrete will no longer transpirate and complete the hydration effect. The defect of spraying plastic film maintenance is the low strength of concrete. And because the film is thin, can not fully achieve the effect of insulation, freezing, so in the summer when using this method is to add sunscreen equipment (not less than 24 hours), otherwise it will cause filamentous cracks in foamed concrete.
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