Russian President says if the European Union imposes an oil embargo, Europe will buy energy at the most expensive price and economic activity in Europe will weaken. Rosneft needs to change its business model. Russia will help facilitate settlement and access to loans and insurance in its own currency.
According to Reuters, the European Commission will unveil a 210 billion euro plan on how Europe can end its dependence on Russian fossil fuels by 2027 and use its distance from Moscow to accelerate a shift to green energy. According to a draft document seen by Reuters, Brussels will propose a three-pronged plan to wean countries off Russian fuel: switch to importing more non-Russian gas, move more quickly to promote renewable energy, and work harder to conserve energy. The draft measures, which include EU law, non-binding plans, and possible recommendations by national governments, are subject to change before publication.
Austria is not a member of NATO and will not seek membership in the future, the Austrian Foreign Minister said in Brussels recently. He stressed that it was "their choice" for Sweden and Finland to seek NATO membership, while Austria would remain neutral.
The supply and prices of many other concrete water reducer are expected to continue to be influenced by international situations.
Concrete is a mixture of a graded aggregate, sand, water, and cement. It is necessary to study the influence of concrete components on the effect of the high-efficient superplasticizer in order to give full play to their due effect.
Graded aggregate and sand in concrete can be collectively referred to as sand and stone, which has almost no effect on the efficient water reducing agent. From the action mechanism of the efficient water reducing agent, it can be known that the efficient water reducing agent mainly acts on cement, and then affects the properties of concrete. Therefore, it is an important direction to study the influence of cement on the performance of high-efficient superplasticizers.
The research shows that the properties of cement, such as composition, fineness, and particle shape, have a certain influence on the performance of superplasticizers.
Effect of concrete composition on the performance of high-efficient water reducing agent
It is found in the experiment that the plasticizing effect of slag cement is better than that of ordinary cement when the content of the superplasticizer is constant. Slag cement slag existing in the small particles, in the process of mixing, contributes to high-efficient water reducing agents and a good contact with water, cement, compared with the ordinary cement, slag cement in favor of the circulation of the high-efficient water reducing agent and uniform distribution, more conducive to play a role of the corresponding high-efficient water reducing agent, intuitive performance the plasticizing effect of slag cement is better than that of ordinary cement.
Effect of cement particle size on the action capacity of superplasticizer
It is found that the particle size of cement has a great influence on the performance of superplasticizer. Under the condition of keeping the other technological conditions and components unchanged, the smaller the particle size of cement, the more efficient water reducing agent can play its performance; On the contrary, the bigger the particle size of cement, the worse the plasticizing effect of the efficient water-reducing agent on cement. From the microscopic point of view, the smaller the cement particle size, the more cement particles per unit volume, the larger the specific surface area, and the more full contact with the efficient water reducing agent, the more conducive to the performance of the efficient water reducing agent.
Experimental data show that when the content of superplasticizer is 1%, the fineness of cement is larger, the efficiency of superplasticizer is more fully played, and the fluidity of cement slurry is better. But when the content of superplasticizer is less than 0.3%, the promotion effect of cement fineness on superplasticizer is almost nonexistent.
Effect of cement particle shape on the action ability of superplasticizer
Cement particle shape on the performance of high-efficient water reducing agent role ability is, after mixing cement, cement particles of different shapes, the flocculant produced condensed structure size and difficulty level of each are not identical, cement slurry liquidity difference is bigger, the effect of the high-efficient water reducing agent to join the environment is different, the beneficial effects are different, will affect the ability to function.
The results show that the effect of the superplasticizer is stronger when the cement particle shape is gravel than when the cement particle shape is pebble. It can be understood that when cement particles are mixed at any time, it is easier to form a flocculation structure. The formation of flocculation structure is more stable and the structure is more continuous, which is conducive to the efficient water reducing agent playing its own effect. And the flocculation structure composed of cement particles in the shape of pebbles is easy to collapse, and the continuity of Xuning structure is not high. Even if the efficient water reducer is not added, part of the free water will be divergent and added to the cement slurry mixing, so that the ability of the efficient water reducer cannot be fully played out.
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The concrete water reducer industry has experienced demand expectations driven by the rise and the off-season tired stock driven by the seasonal decline in two rounds of the market. Affected by the COVID-19 epidemic and other factors, inventories of manufacturers continue to accumulate, putting pressure on market sentiment. In addition to off-season factors, the weak trend of concrete water reducer also reflects the market's concern about the epidemic and some other related enterprises' financial situation.
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