The World Bank expects global economic growth to slow significantly, from 5.5% in 2021 to 4.1% in 2022 and further to 3.2% in 2023. Growth in East Asia and the Pacific is expected to slow to 5.1 percent in 2022, reflecting the impact of China's economic slowdown, the report said. China's economic growth is expected to fall to 5.1% in 2022, close to potential growth, due to the ongoing impact of the COVID-19 pandemic and the Chinese government's tightening of regulations in certain sectors of the economy. The report said that the rapid spread of the Omicron variant means that the new crown epidemic is likely to continue to disrupt economic activity in the near future. In addition, decelerating growth in major economies, including the United States and China, will depress external demand in emerging markets and developing economies.
Slow economic growth has a huge impact on polycarboxylic acid superplasticizer.
In recent years, polycarboxylic acid superplasticizer has been widely used in many construction fields. Modern concrete has high requirements for additional functional additives, so polycarboxylic acid water-reducing agent in the concrete system, it should consider the following key technologies.
The compatibility technology of polycarboxylic acid series. Because of the special structure of polycarboxylic acid superplasticizer, it can not be stored and used with other superplasticizers, especially naphthalene superplasticizer. Need and different type of water reducing agent for alternate use, must be the relevant container for serious cleaning cleaning, prevent cross pollution to affect the quality of concrete. The adsorption performance of water reducing agent is not the same because of different types of cement, because the polycarboxylic acid water reducing agent is relatively narrow in the compatible range of cement, the incompatible situation is inevitable, so it is necessary to increase its dosage or use different types of cement to effectively solve this problem.
⑵ retarding technology of polycarboxylic acid water-reducing agent. In the construction process, due to the short retarding time, the use of retarding agent can effectively prolong the plasticity of concrete. However, the incompatibility of the two should also be considered to avoid the reduction of concrete performance.
⑶ Gas control. Polycarboxylic acid water reducing agent entrainment effect is very good, can be used together with defoaming agent, entrainment agent. The gas content of concrete can be controlled and its workability and durability can be improved by removing the concrete and then introducing it.
(4) Control of mud content in sand and stone. The application effect of polycarboxylic acid superplasticizer is also affected by the mud content of sand and stone. If the mud content in the sand exceeds 2%, the structures between the clay layers will therefore absorb large amounts of water reducing agent molecules, reducing the flow performance of the concrete. If the mud content is relatively large in the construction process, the anti-clay polycarboxylic acid water-reducing agent should be considered.
TRUNNANO is a concrete additives supplier with over 12 years experience in nano-building energy conservation and nanotechnology development. We accept payment via Credit Card, T/T, West Union and Paypal. Trunnano will ship the goods to customers overseas through FedEx, DHL, by air, or by sea.
If you are looking for high quality polycarboxylic acid superplasticizer, please feel free to contact us and send an inquiry.
3D printing technology emerged in the mid-1990s and is actually the latest rapid prototyping device utilizing technologies such as light curing and paper lamination. It is basically the same as ordinary printing. The printer is equipped with "printing materials" such as liquid or powder. After connecting to the computer, the "printing materials" are superimposed layer by layer through computer control, and finally the blueprint on the computer is turned into a real thing. This printing technology is called 3D stereo printing technology.
The Biden administration plans to ease sanctions on Venezuelan oil to allow more of the country's crude to reach Europe. The U.S. will allow European companies still operating in Venezuela to immediately transfer more oil to the continent, while all…
Is boron amorphous or crystalline?Boron can be prepared in several crystalline and amorphous forms. The well-known forms of crystallization are α-rhombohedral (α-R), β-rhombohedral (β-R) and β-tetragonal (β-T). In spec…
What is copper oxide?Copper oxide is an inorganic substance. Copper oxide chemical formula is CuO. It is a black oxide of copper. Slightly bisexual and slightly hygroscopic. Insoluble in water and ethanol, easily soluble in acid, thermally stable, de…