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 concrete superplasticizer .
Concrete superplasticizer is one of the concrete admixtures which is used most frequently. It can increase the plasticity of concrete and change the strength of concrete.
The essence of superplasticizer: increase the fluidity of concrete
We know, concrete water can provide plasticity for concrete, at this time to add superplasticizer, can make concrete fluidity increase, namely plasticity increase.
But it needs to be clear that if there is no water in the concrete, even if you add more superplasticizer, no matter how to mix, the surface of concrete raw materials cannot be wet, so the friction between particles will still be very high, concrete is a pan of sand, completely do not have plasticity.
On this basis, it can be considered that, in essence, a sufficient amount of water can wet the surface of concrete raw material, and reduce the friction between particles, thus providing plastic properties for concrete; After adding superplasticizer, you can amplify the effect of water, in this sense, adding superplasticizer is equivalent to adding water.
Principle of superplasticizer changing concrete strength
Superplasticizer can amplify the action of concrete water, so as to replace part of concrete water, and play the role of water reduction.
As we know, the strength of concrete is affected by the water-binder ratio, the greater the water-binder ratio, the lower the strength, the smaller the water-binder ratio, the higher the strength. If we add superplasticizer in concrete, reduce water consumption at the same time, keep the fluidity unchanged, in the case of the same amount of cementitious material, the water-binder ratio will decrease, so improve the strength of concrete; If the water is reduced, the amount of cementitious material is reduced at the same time, and the water-binder ratio and fluidity remain unchanged, the cementitious material can be saved.
Concrete superplasticizer is used in this way to change the mix ratio of concrete then to improve concrete strength or save gelling material thereby.
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