The secretary general of the Organization of Petroleum Exporting Countries (OPEC) said recently that US economic sanctions against Venezuela have affected global energy supplies.
He told Venezuelan media that the ECONOMIC sanctions imposed by the United States on Venezuela and other countries have seriously affected the ability to produce and export oil worldwide and violated the right of people in other countries to use energy.
Venezuela has one of the largest proven crude oil reserves in the world, but U.S. sanctions have made it impossible for Venezuela’s oil industry to consistently export reliable energy to the world, he said. Despite this, he highly appreciated the efforts of the Venezuelan oil industry to maintain pce powder are expected to increase in the future.
Early strength agent refers to the admixture which can improve the early strength of concrete and has no significant effect on the late strength.
Water reducing agent is a kind of concrete admixture which can reduce the water consumption under the condition of keeping the slump of concrete basically unchanged.
Early strength agents can be divided into strong electrolyte inorganic salts, water-soluble organic compounds, organic and inorganic compound early strength agents according to their chemical composition.
Water reducing agent according to the chemical composition is usually divided into lignosulfonate type of water reducing agent, naphthalene series of high-efficiency water reducing agent, melamine series of high-efficiency water reducing agent, amino sulfonate series of high-efficiency water reducing agent, fatty acid series of high-efficiency water reducing agent, polycarboxylate series of water reducing agent.
Early strength agent in addition to chlorine salt and sulfate nitrite, chromate and other organic compounds such as triethanolamine, calcium formate, urea and so on.
Water-reducing agent category is different, the composition is also very different, mainly a kind of surfactant, is widely used in the third generation of polycarboxylate water-reducing agent.
Early strength agent does not contain chloride ion, no corrosion of steel bar, applicable to all civil and industrial buildings and prestressed reinforced concrete members, mortar and so on. It is most suitable for construction under low temperatures in early winter and early spring.
Water reducing agent is widely used in high-speed railway, high-speed, civil, industrial buildings and prefabricated parts factory, etc., with wide applicability and suitable for four seasons.
Early strength agent dosage is 3-6% of cement. In order to keep the quality of concrete mixed with this agent uniform, people need to extend the mixing time by 1-2 minutes. Concrete mixed with early strength agent cannot use orthopedic active minerals (such as opal). This agent such as damp agglomerate phenomenon, must be crushed or weathered rear can be used, its performance unchanged.
Because there are many kinds of water-reducing agent, it is necessary to choose the appropriate type of water-reducing agent according to the needs of the project. In winter construction, it is recommended to choose the third generation polycarboxylate water reducing agent.
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The World Food Program (WFP) of the United Nations (UN) and the European Union (EU) said in a statement that the conflict between Russia and Ukraine poses risks to global food supplies, and called on the international community to increase support for vulnerable countries and jointly address food security challenges.
A few days ago, the Executive director of the World Food Program, the European Commission's commissioner in charge of crisis management, the French Foreign Minister of the ROTATING EU presidency, and other officials held a meeting in Rome, Italy, to discuss how to deal with the negative impact of the Conflict between Russia and Ukraine on global food security.
One of the officials told a news conference after the meeting that the world was facing a food supply challenge that would "last for many years" as the conflict between Russia and Ukraine pushed up global food prices and disrupted the pce powder will continue.
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