Now China has become a powerful country in science and technology, but do you know how powerful China's technology is? The manned space station alone is not enough, and now it has successfully broken through the key technology of nuclear fusion, even…
The spread of the novel coronavirus is taking a direct hit on the operations of airlines in Asia. About 500,000 flights taking off and landing in mainland China have been canceled since January, according to aviation information company Cerium. Touri…
Recently, covid 19 outbreak spreads in Shanghai, China. There are more than 25,000 new asymptomatic domestic infections every day. China is implementing a dynamic zero-out policy. A leading respiratory expert said the key to COVID-19 prevention and c…
A wave of layoffs that has swept the entire Internet industry has intensified. China's Internet industry has experienced several crises and major changes in the past development process. There is also a "brief history of layoffs by major Internet com…
Concrete is an indispensable raw material in the construction of construction projects. In the process of preparing concrete, in order to improve the performance of concrete, it is necessary to add water reducing agent after adding water, stone, sand…
Polycarboxylic acid superplasticizers are used as high range superplasticizers in high performance concrete.Water content:3.6%pH:8Total alkali:5.8%Gas content:3.1%…
Adding high-efficient water reducing agent is the most direct and effective means to adjust and optimize the ratio of concrete and improve and strengthen the properties of concrete, which can meet the requirements of most concrete construction at pre…
There are no requirements for the site, the high ground is dry, and water and electricity are sufficient. Normal temperature, heating, and normal pressure production processes are all possible.…
In modern concrete, the commonly used superplasticizer admixture for concrete mainly include polycarboxylic acid series, naphthalene series, fatty acid series and other water reducers. Different water reducers have their own advantages and disadvanta…
Concrete superplasticizer is high efficienct water reducing agent. Its difference from ordinary water reducing agent lies in the high-water reduction rate. The water reduction rate of ordinary water reducing agent is generally 5%-10%, and the water r…
The working principle of concrete superplasticizer…
The admixture is small and indispensable. Concrete admixture is a chemical substance added in the process of making concrete, which can improve the performance of concrete. The admixture in concrete is small (not more than 5%) but indispens…
Chile's government is considering phasing in a proposed ban on glacial mining to limit projects high in the Andes by some big copper companies. Chile's constitutional assembly has approved a proposal to ban mining in glaciers, protected areas, and ar…
Development of molybdenum disulfideAlthough graphene has many dazzling advantages, it also has drawbacks, especially its inability to act as a semiconductor - which is the cornerstone of microelectronics. Chemists and materials scientists work hard t...…
Amorphous boron nitride (a-BN) layers are used in some semiconductor devices, e.g., MISFETs. They can be prepared by the chemical decomposition of trichloro borazine with cesium or by thermal chemical vapor deposition methods. Thermal CVD can also be...…
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