The US Commerce Secretary has announced that the US will temporarily lift tariffs imposed on Ukraine during the Trump administration to help Ukraine recover its economy and continue to show support for the Russia-Ukraine situation. "For steel mills to remain an economic lifeline for the Ukrainian people, they must be able to export steel," the Commerce Department said in a statement.
The Biden administration will announce the lifting of steel tariffs on Ukraine for one year. Ukraine is a fairly small supplier of U.S. steel, shipping about 218,000 tons in 2019, ranking it 12th among foreign suppliers to the United States, the report said. The U.S. Commerce Department noted that the steel industry is uniquely important to Ukraine's economic strength, with one in 13 people employed in the steel industry.
Affected by the ever-changing international situation, the supply and prices of international bulk concrete superplasticizer are still very uncertain.
Concrete superplasticizer is one of the concrete admixtures which is used most frequently. It can increase the plasticity of concrete and change the strength of concrete.
The essence of superplasticizer: increase the fluidity of concrete
We know, concrete water can provide plasticity for concrete, at this time to add superplasticizer, can make concrete fluidity increase, namely plasticity increase.
But it needs to be clear that if there is no water in the concrete, even if you add more superplasticizer, no matter how to mix, the surface of concrete raw materials cannot be wet, so the friction between particles will still be very high, concrete is a pan of sand, completely do not have plasticity.
On this basis, it can be considered that, in essence, a sufficient amount of water can wet the surface of concrete raw material, and reduce the friction between particles, thus providing plastic properties for concrete; After adding superplasticizer, you can amplify the effect of water, in this sense, adding superplasticizer is equivalent to adding water.
Principle of superplasticizer changing concrete strength
Superplasticizer can amplify the action of concrete water, so as to replace part of concrete water, and play the role of water reduction.
As we know, the strength of concrete is affected by the water-binder ratio, the greater the water-binder ratio, the lower the strength, the smaller the water-binder ratio, the higher the strength. If we add superplasticizer in concrete, reduce water consumption at the same time, keep the fluidity unchanged, in the case of the same amount of cementitious material, the water-binder ratio will decrease, so improve the strength of concrete; If the water is reduced, the amount of cementitious material is reduced at the same time, and the water-binder ratio and fluidity remain unchanged, the cementitious material can be saved.
Concrete superplasticizer is used in this way to change the mix ratio of concrete then to improve concrete strength or save gelling material thereby.
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Recently, the first press conference of the Boao Forum For Asia Annual Conference 2022 was held. Two flagship reports were released at the conference: "Asia's Economic Prospects and Integration Process 2022" and "Sustainable Asia and the World 2022-Green Transformation in Action in Asia".
The flagship report points out that the global economy will recover in 2021, and the pace of economic integration in the Asia-Pacific has not stopped even in the face of the impact of COVID-19. The Asia-Pacific region has provided new impetus for the world's economic recovery and institutional building.
The report gives an outlook on the Asian economy, noting that a number of factors will affect Asian economic growth. For example, mutated strains such as Delta and Omicron have become more transmissible, and many economies are experiencing epidemic peaks again. The Ukraine crisis has triggered geopolitical changes in Asia and Europe, leading to higher commodity prices, which may affect the global energy supply and energy transformation.
The report pointed out that the Asian economy will still be in the process of recovery in 2022, but the growth rate may moderate. According to the report, Asia's economic growth in 2022 is likely to be lower than the current IMF forecast, which is projected at 4.8%.
Affected by several factors, the supply of the concrete superplasticizer is erratic and thus its prices are expected to go higher in the future.
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