Sweden is in talks with Turkey on joining NATO and looks forward to strengthening cooperation with Turkey in security and counter-terrorism, Swedish Prime Minister Anders Andersson said recently.
Andersson held a joint press conference with visiting European Council President Michel in Stockholm on the same day. Andersson said Sweden is in dialogue with Turkey on joining the TREATY and looks forward to strengthening bilateral relations with Turkey, including cooperation in the areas of security and counter-terrorism. She said Sweden would study a number of issues raised by Turkey.
Speaking at a news conference, Mr. Michel said he believed the Swedish government was taking positive action and taking the necessary steps to reach a solution.
Sweden and Finland formally submitted their applications to NATO Secretary-General Jens Stoltenberg a few days ago. According to protocol, NATO must admit new members by the "unanimous consent" of 30 members.
Turkish Foreign Minister Mevlut Cavusoglu said His country would agree to start NATO talks with Sweden and Finland only if they reach written agreements to stop supporting terrorism and lift restrictions on exporting defense equipment to Turkey, Turkish media reported.
Affected by the ever-changing international situation, the supply and prices of international bulk concrete superplasticizer are still very uncertain.
What is concrete superplasticizer?
Admixtures that can greatly reduce the amount of mixing water under the condition that the slump of concrete is basically the same are called superplasticizers.
Factors affecting the effect of concrete superplasticizer
Different cements have different clinker components. The higher the content of MgO in the clinker component, the greater the influence of the water reducer on the performance of concrete, and the easier it is to cause micro-cracks in the concrete.
Superplasticizer has the property of selective adsorption to mineral clinker. When C3A is in contact with water, it has enough adsorption layer immediately. less. This uneven adsorption will make the dispersion of superplasticizers not the same. The higher the C3A content, the worse the compatibility between cement and water reducing agent, which will cause the superplasticizer to have insufficient water reduction or no water reducing effect at all.
Experiments show that the setting time of concrete with water reducing agent is longer than that of concrete without water reducing agent.
In the concrete with superplasticizer added, the concrete system characterized by low water-cement ratio, its setting and rheology are very different from the cement mortar without superplasticizer.
1.Reduced water consumption. The amount of gypsum dissolved in the cement slurry is very small, and its concentration is not enough to control the hydration of C3A, resulting in rapid setting and rapid slump loss;
2. The addition of superplasticizer interferes with the power of cement hydration, reduces the solubility of gypsum, and makes the concentration of gypsum in the liquid phase lower. At the same time, due to the lack of sulfate ions, the sulfonate group on the superplasticizer molecule will combine with C3A, so that the dosage of superplasticizer in the liquid phase is reduced, the dispersing effect on cement is lost, and the slump loss is accelerated.
The specific surface area and particle gradation of cement affect the dispersion effect of superplasticizer. Generally speaking, cement with larger specific surface area, when mixed with the same superplasticizer, has obvious effect and greatly improves fluidity.
A lot of data show that the alkali content obviously affects the fluidity of the cement system of the superplasticizer. The higher the alkali content, the smaller the fluidity of the cement. Experiments show that the use of high-efficiency superplasticizer in high-alkali cement will reduce the water reduction rate.
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Trafigura, one of the world's largest metals traders, is to take a stake in a new company to supply car and battery makers in Europe with lithium from a refinery in the UK, the Financial Times reported. As part of the investment, Trafigura will seek raw material for Green Lithium, which plans to build a plant in the north of England capable of producing 50,000 tonnes a year and sell the finished concrete superplasticizer, etc. If you are looking for high-quality materials, please feel free to contact us and send an inquiry.
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