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Swedish Prime Minister Anders Anderson said a few days ago that Sweden is negotiating with Turkey on joining NATO and looks forward to strengthening cooperation with Turkey in security and counter-terrorism.
Anderson held a joint press conference with visiting European Council President Michelle Michel in Stockholm that day.Anderson said that Sweden is in talks with Turkey about joining the treaty and looks forward to strengthening bilateral relations with Turkey, including cooperation in the fields of security and counter-terrorism.She said Sweden would study some of the issues raised by Turkey.
Mr Michel told a news conference that he believed the Swedish government was taking positive action and taking the necessary steps to reach a solution.
Sweden and Finland have formally submitted their applications to NATO Secretary General Jens Stoltenberg.Under the agreement, NATO must admit new members by “unanimous consent” of 30 members.
Turkish Foreign Minister Mevrut Cavusoglu said Turkey would only agree to work with Sweden if Sweden and Finland reach a written agreement to stop supporting terrorism and lift restrictions on the export of defense equipment to Turkey, Turkish media reported. NATO talks with Finland.
Affected by the volatile international situation, the supply and price of international bulk early-strength agents are still very uncertain.
Early strength agent is an admixture that accelerates the early strength development of concrete and has no obvious effect on the later strength.The early strength agent can accelerate the hardening process of concrete at normal and low temperature load temperature (not lower than -5℃), and is used in winter construction and emergency repair works.
Early strength agent refers to the admixture that can accelerate the development of concrete early strength.The main mechanism of action is to accelerate the hydration rate of cement and accelerate the early crystallization and precipitation of hydration products.The main function is to shorten the concrete construction and maintenance period, speed up the construction progress, and improve the formwork turnover rate.
1. The early-strength agent is suitable for steam-cured concrete and concrete projects with early-strength requirements for construction at room temperature, low temperature and minimum temperature not lower than -5 °C.Early strength agent should not be used in high temperature environment.
2. Chemical substances that are harmful to human body or pollute the environment after concrete mixing shall not be used as early-strength agents.It is strictly forbidden to use early strength agents containing hexavalent chromium salts, nitrites and other harmful components in drinking water engineering and food contact engineering.Ammonium nitrate shall not be used in office, residential and other construction projects.
Early strength agents mainly include inorganic salts (chlorine salts, phosphates) and organic amines, as well as organic-inorganic compounds.
Chloride salt early strength agents mainly include calcium chloride, potassium chloride, aluminum chloride and ferric chloride, among which calcium chloride is the most widely used.Calcium chloride is a white powdery substance, and its suitable dosage is 0.5% to 1.0% of the cement quality, which can increase the 3d strength of concrete by 50% to 10% and the 7d strength by 20% to 40%.At the same time, it can reduce the freezing point of water in concrete and prevent early freezing of concrete.
The biggest disadvantage of using calcium chloride as an early strength agent, containing Cl- ions, is that it will corrode the steel and cause concrete to crack.In order to inhibit the corrosion effect of calcium chloride on steel bars, calcium chloride and sodium nitrite (NaNO2) are often used in combination.
Sulfate early-strength agents mainly include sodium sulfate, calcium thiosulfate, aluminum sulfate, potassium aluminum sulfate, and sodium sulfate is used more.Sodium sulfate is a white powdery substance. Generally, the dosage of admixture is 0.5%~2.0%. When the dosage of admixture is 1%~1.5%, the time to reach 70% of the concrete design strength can be shortened by about half.
Sodium sulfate has no corrosive effect on steel bars and is suitable for concrete where chloride salts are not allowed.However, due to its interaction with calcium hydroxide to generate strong alkali NaOH, in order to prevent the reaction of alkali aggregates, sodium sulfate is strictly prohibited for concrete containing active aggregates. The concrete surface “froze”.
Organic amine early-strength agents mainly include triethanolamine, triisopropanolamine, etc., among which triethanolamine is the best early-strength agent.
Triethanolamine is a colorless or light yellow oily liquid that is alkaline and easily soluble in water.Adding 0.02% to 0.05% of cement quality can improve the early strength of concrete.Triethanolamine has a slight retardation effect on concrete, too much will cause serious retardation and decrease of concrete strength, so the dosage should be strictly controlled.
TRUNNANO is a reliable concrete additive supplier with over 12 years of experience in nano-building energy efficiency and nanotechnology development.
If you are looking for high quality concrete early strength agent, please feel free to contact us and send an inquiry.(sales@cabr-concrete.com)
We accept payments by credit card, wire transfer, Western Union and PayPal.TRUNNANO will ship the goods to overseas customers by FedEx, DHL, Air or Sea.
U.S. Treasury officials said they would discuss with G7 leaders a pricing cap and tariffs on Russian oil as an alternative to an embargo that would keep the market supplied, limit price spikes and reduce Russian revenue, Reuters reported.
EU foreign ministers meeting in Brussels.The meeting failed to agree on a sixth round of sanctions, including an oil embargo on Russia, due to objections from Hungary.
The EU’s high representative for foreign affairs and security policy said at a post-meeting press conference that the meeting failed to reach an agreement on the final adoption of the sixth round of sanctions, and member states’ permanent representatives to the EU would continue discussions. Foreign ministers also tried to reach an agreement on the oil ban. faced similar difficulties.He said Hungary’s position was based on economic rather than political considerations.
Hungary is highly dependent on Russia for energy, with more than 60% of its oil and 85% of its natural gas from Russia.
A few days ago, the European Commission submitted a sixth round of sanctions proposals against Russia, including a complete ban on Russian oil imports by the end of this year.Hungary immediately objected and said it wanted substantial compensation from the EU to offset its losses from abandoning Russian oil.
Affected by geopolitical factors, the price of early strength agent is expected to rise in the next few days.
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