Study On Early Strength Effect of Lithium Carbonate On Mortar
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Roche and its subsidiary TIB Molbiol have developed a series of tests for the detection of the monkeypox virus, the Switzerland-based pharmaceutical company announced.
The monkeypox virus is a close relative of the smallpox virus, belonging to orthpoxviridae in the poxviridae family.
The modular virus detection tool, called LightMix, includes three orthpoxvirus detection kits with different functions, Roche said in a statement. The first kit detects orthpoxvirus; The second kit tests only for monkeypox virus (west and Central African branches); The third kit contains the main functions of the first two kits, showing specific information on the presence of the monkeypox virus (west and Central African branches) as well as the detection of orpoxvirus.
Thomas Schinek, a Roche executive, said the new test could detect monkeypox and help track its spread. Such diagnostic tools are critical for addressing and ultimately managing emerging public health challenges, as they advance responses such as tracking efforts and treatment strategies.
The monkeypox virus was first identified in 1958 in a group of monkeys used for research when the animals developed a "pox-like" infection, hence the name. Since May, several non-endemic countries have reported human cases of the monkeypox virus, including the United Kingdom, the United States, Portugal, Spain, and Italy.
Affected by the ever-changing international situation, the supply and prices of international bulk early strength agent are still very uncertain.
Mortar early strength agent is an important mortar additive, which has an important influence on the performance of mortar. it can improve construction efficiency and save construction cost.
Lithium carbonate is a kind of inorganic compound with chemical formula Li2CO3, which is colorless monoclinic crystal or white powder. The density is 2.11g/cm3. Melting point is 618℃(1.013*10^5Pa). Soluble in dilute acid. It is slightly soluble in water, and its solubility in cold water is higher than that in hot water. Insoluble in alcohol and acetone. It can be used to make ceramics, drugs, catalysts and so on.
Lithium salt early strength agents can promote the setting and early strength of cement mortar. The results show that lithium salt early strength agent shortens the hydration induction period by accelerating the rupture of hydration protective film, improves the low temperature hydration ability of cement mortar, obviously shortens the low temperature thickening time, and improves the low temperature compressive strength of cement mortar. it shows excellent effect of early strength at low temperature.
Because portland cement is often used in mortar, it is characterized by low strength at early stage and high strength at later stage. In order to improve its early strength, adding an appropriate amount of lithium carbonate to the product is very beneficial to improve its early strength.
In mortar products, lithium carbonate is mainly used in grouting materials, cement-based plastering mortars, repair mortars, seat pastes and other products. In order to improve the early strength, high alumina cement is usually added to the mortar as a setting accelerator, and antifreeze is needed in the low temperature environment. Lithium carbonate has dual functions, which can not only accelerate the hardening speed of cement and improve its early strength, but also avoid the problem of slow setting speed in winter construction or in low temperature and humid environment, so that cement products can be put into use as soon as possible. Lithium carbonate especially makes a great contribution to the early strength. In summer, the amount of lithium carbonate is usually 0.01%-0.03% of the quality of cement, while in winter, the amount of lithium carbonate should increase appropriately with the decrease of temperature, and the amount is about 0.02%-0.05%. The amount of lithium carbonate should not be too high, otherwise it will lead to cracking.
In addition, the performance of lithium carbonate to improve the early strength of mortar is not proportional linear. With the increase of the amount of lithium carbonate, the enhancement of its strengthening effect is no longer obvious.
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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 early strength agent will continue.