How to maintain foam concrete?

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A recent poll in Britain found that public support for sanctions against Russia is falling as fuel and prices rise.  

The proportion of people willing to accept higher fuel prices as a result of western sanctions against Russia fell 14 percentage points to 36% from 50% in March, according to a survey conducted for the Telegraph by consultancy Redfield & Wilton Strategies.  

Global energy and fuel prices have soared since the start of the year and remain high because of the conflict between Russia and Ukraine and uncertainty over Russian supplies.  

The survey also found that 54% of people believe their own financial situation has worsened in the past year, up 12 percentage points from 42% two months ago. Sixty-two percent think things will get worse in the year ahead. Less than a third of respondents said they had received a pay rise to keep up with inflation, with two-thirds of those saying it was not enough to keep up with rising living costs.  

The figures suggest that public concern about the conflict with Ukraine is now likely to be overtaken by financial worries.  

Separately, the UK's consumer price index rose 7 percent this month from a year earlier, the highest since March 1992, according to figures released recently by the Office for National Statistics. In addition, a separate report released a few days ago by the Centre for Economics and Business Research said that real household disposable income in the UK will fall by 3% in 2022, equivalent to a loss of £2,320 per household, which would lead to the biggest drop in living standards since the 1950s. That is mainly because wages aren't keeping up with rising energy and fuel costs.  

The prices of other commodities like the concrete foaming agent are also expected to be influenced.

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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"Is there talk of solidarity with Sweden and Finland joining NATO? No." "So is the West united?" Zelensky said at this Ukraine-hosted breakfast in Davos. No." "Our strength is unity within the country," Zelensky said. "Now it depends on the Unity of the West to stand strong and firm behind Ukraine against Russia.

According to Zelensky, "When we are all really united, we will have an advantage over Russia."  

Ukrainian President Volodymyr Zelensky says he once again appreciates U.S. President Joe Biden's offer of $40 billion in new financial aid to Ukraine.  

"We need the support of a united Europe," Zelensky stressed. Zelensky criticized the position of Hungarian Prime Minister Viktor Orban, who is reluctant to impose an embargo on Russian oil at this stage. "Hungary has a problem!" Zelensky criticized.

The supply and prices of many other concrete foaming agent are expected to continue to be influenced by changing international situations.

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