Effect of polycarboxylate superplasticizer

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 control is to minimize transmission and fatality rate. Omicron has a low case fatality rate but is highly transmissible and can still claim many lives in large outbreaks. "Total openness is not applicable in China.  For China, we should keep to the dynamic zero-out and gradually open up."  

However, "dynamic zero clearance" is not the pursuit of complete "zero infection".  As the Novel Coronavirus has its own uniqueness and strong concealment, there may be no way to prevent the detection of cases at present, but rapid detection and prompt treatment must be carried out, as soon as one case is found, one case will be dealt with.  

The situation in Shanghai is serious. As the financial center of China, Shanghai is a very important city, and the outbreak of the epidemic in Shanghai will put a great impact on China's economy.  The current task is to contain the spread of the epidemic as soon as possible, to achieve social zero so that Shanghai's life and economy quickly return to normal.  

As China plays an important role in the global supply chain, the outbreak will have a significant impact on the supply and prices of many pce powder.

Polycarboxylate superplasticizer plays four main roles in concrete mixture: 1. In order to improve the pouring performance of concrete, the workability of concrete is improved without changing the composition of concrete. Under the given working conditions, the water-cement ratio of mixed water and concrete is reduced, and the strength and durability of concrete are improved. Under the condition of ensuring the pouring performance and strength of concrete, reduce the amount of water and cement, reduce creep, dry shrinkage, cement hydration heat and other factors that cause the initial defects of concrete; 4. The role of polycarboxylate superplasticizer in high grade can not be replaced by other admixtures.

Polycarboxylate superplasticizer Properties:

1. The amount of polycarboxylate superplasticizer is low, the water-reducing rate is high, the acid-based superplasticizer accounts for 0.80% of the cementitious materials, and the water-reducing rate can reach (20)%. When used in conjunction with fly ash, the water glue is relatively low and is suitable for the preparation of medium-and high-strength high-performance concrete.

2. The fluidity of concrete is large and the slump loss is small. Due to the good dispersion stability of polycarboxylate superplasticizer, the high fluidity concrete (slump ≥ 180mm) prepared by polycarboxylate superplasticizer has small time loss, no slump loss in one hour and less than 15% in two hours, which makes up for the defects of high slump loss and easy bleeding of concrete prepared with naphthalene superplasticizer. When combined with fly ash, excellent fluidity can be obtained with a small amount of superplasticizer, which can meet the technological requirements of producing commercial concrete, especially for pumping concrete.

3. Good adaptability to cementitious materials. In engineering practice, the cement produced by different manufacturers is mixed with a large amount of fly ash, and the polycarboxylate superplasticizer has good compatibility with different cements. there is no obvious bleeding segregation and hinders the growth of concrete strength, and because of its high water-reducing rate and adapting to the use of fly ash, the shrinkage of fly ash concrete is reduced and the pumpability of concrete is obviously improved. And the durability of concrete is improved. When the design strength grade of concrete is the same, the amount of cement increases, the amount of superplasticizer increases, the water-binder ratio decreases and the concrete strength increases; for different design strength grades of concrete, the amount of superplasticizer increases slightly with the increase of the amount of cementitious material, the water-binder ratio decreases, and the strength of concrete increases, but the concrete and workability remain stable as a whole, and the slump can reach (180 / 240) mm.

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Maximo Pacheco, chairman of Codelco, Chile's state copper company, said in a recent interview that he expects copper prices to remain 'very strong in the future,' despite the recent drop. Codelco is the world's largest copper producer.

Copper prices suffered their biggest weekly drop in a year this week on concerns that tightening policy by central banks will dampen global growth and reduce demand for industrial metals. With its wide range of industrial and construction uses, copper prices are often seen as a bellwether of economic activity.

London copper closed at $8,325 a tonne on Friday after touching $8,122.50 a tonne, down 25 per cent from its Peak in March and its lowest level since February 2021. In addition to copper, other industrial metals also fell sharply. Tin, for example, fell nearly 15% at one point on Friday, bringing its losses for the week to about 25%.

"We may be in a temporary short-term turbulence, but what is important is the fundamentals and the balance of supply and demand [currently] looks very favourable for those of us with copper reserves," Mr. Pacheco said. Chile is the world's largest copper producer.  

Mr. Pacheco adds that in a world where copper is the best conductor and there are not many new reserves, copper prices look very strong because the future is very favourable for electrification.

Luoyang Tongrun Nano Technology is a trusted chemical supplier and manufacturer providing high-quality chemicals and Nanomaterials. If you are looking for the pce powder, please feel free to contact us and send an inquiry.

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