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 water reducer,water reducing agent ,concrete admixtures are still very uncertain.
The application of various concrete admixtures can not only improve the performance of concrete, but also promote the development of new concrete technologies, promote the application of industrial by-products in cementitious material systems, and also help save resources and protect the environment. , has gradually become an essential material for high-quality concrete. Among them, the water reducing agent is a kind of concrete, and the water reducing agent is a concrete admixture that can reduce the mixing water consumption under the condition that the concrete slump is basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalene sulfonate formaldehyde polymer, etc. When we add the concrete mixture, it has a dispersing effect on the cement particles, which can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption, effectively saving cement.
The specific operation method of the water reducing agent formula for concrete:
1. Maleic anhydride is prepared into a 5-7% solution according to the required amount and recorded as the head material.
2. The initiator is prepared into a 5-10% solution for later use.
3. Add the required amount of APEG or TPEG, heat to liquefy it, and then add the headstock.
4. Nitrogen replacement;
5. When the temperature rises to 75-85°C, the initiator is added dropwise, and the dropwise addition is completed at 80°C for 1.5-2 hours.
6. After the dropwise addition of the initiator is completed, keep the temperature at 80-90° C. for 4-4.5 hours to complete the reaction and cool down.
7. When the temperature drops to 40-50℃, add 50% KOH solution to neutralize to PH: 7-8.
8. After measuring the solid content, add the measured soft water according to the required solid content.
9. After the solid content is determined to be qualified, discharge the material.
After the above experiments, we can get the basic formula of water reducer for concrete:
Concrete water reducer formula 1:
Hydroxyethyl acrylate: 25g, acrylamide: 5g, allyl polyoxyethylene ether: 175g, sodium persulfate: 10g, neutralized by sodium hydroxide.
Concrete water reducer formula 2:
Allyl polyoxyethylene glycol ether: 40 g, acrylic monomer: 30 g, 10% ammonium persulfate aqueous solution 40 g, neutralized with triethanolamine.
Concrete water reducer formula 3:
Allyl polyoxyethylene glycol ether: 100 g, methacrylic acid: 70 g, acrylic acid: 20 g, 10% aqueous ammonium persulfate solution: 50 g, neutralized with sodium hydroxide.
Concrete water reducer formula 4:
Methacrylic acid: 25g:, allyl polyoxyethylene ether: 175g, sodium persulfate: 10g. , neutralized with sodium hydroxide.
Concrete water reducer formula 5:
TPEG: 180 g, hydrogen peroxide: 0.63 g, thioglycolic acid: 0.56 g, ascorbic acid: 0.3 g, acrylic acid: 182.3 g, neutralized with sodium hydroxide.
Concrete water reducer formula 6:
APEG: 180 g, hydrogen peroxide: 10 g, thioglycolic acid: 2.07 g, itaconic acid: 10 g, methacrylic acid: 21.23 g, neutralized with sodium hydroxide.
The above is for reference only. If you need more, you can find a professional concrete water reducer formulation and component analysis and testing agency to provide concrete water reducer, concrete additive formula reduction, concrete polyacid water reducer component analysis, concrete water reducer Formula analysis, proportion of concrete water reducing agent, decryption of water reducing agent formula, composition analysis of concrete water reducing agent, composition test of concrete water reducing agent, identification of concrete water reducing agent raw materials, etc. Analyze the chemical name and approximate content ratio of each raw material in the sample, provide technical assistance for your production, and even develop the preparation method of the sample for you.
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