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. Tourists and business trips have plummeted. On the booking website, there are a large number of air tickets for local routes with a price reduction of nearly 90% compared with the original price and only tens of yuan for a one-way trip.
In February, China's aviation industry recorded its largest single-month loss of 24.59 billion yuan, of which airlines lost 20.96 billion yuan.
Data from the Civil Aviation Administration of China showed that in February, the number of passengers traveling by air fell 84.5% year-on-year to 8.34 million.
The stagnation of the Asian aviation industry has brought volatility to polycarboxylate superplasticizer ,polycarboxylic acid superplasticizer,pce based superplasticizer.
Superplasticizer admixture for concrete is one of the most used concrete admixtures, which can increase the plasticity of concrete and change the strength of concrete. But do you know how it can change the strength of concrete?
1. The essence of polycarboxylic acid superplasticizer: increase the fluidity of concrete
We know that water in concrete can provide plasticity for concrete. At this time, adding polycarboxylic acid superplasticizer can increase the fluidity of concrete, that is, increase the plasticity.
But it needs to be clear that if there is no water in the concrete, no matter how much water reducing agent is added, the surface of the concrete raw material will not be wetted no matter how it is mixed, so the friction between particles will still be high, and the concrete is a mess of loose sand. , is completely non-plastic.
On this basis, it can be considered that, in essence, a sufficient amount of water can wet the surface of concrete raw materials and reduce the friction between particles, thereby providing plastic properties for concrete; after the addition of superplasticizer polycarboxylate, this effect of water can be amplified. In this In a sense, adding water reducing agent is equivalent to adding water.
2. The principle of polycarboxylic acid superplasticizer to change the strength of concrete
The pce based superplasticizer can amplify the effect of concrete water, so that it can replace part of the concrete water and reduce water.
We know that the strength of concrete is affected by the water-binder ratio. The larger the water-binder ratio, the lower the strength, and the smaller the water-binder ratio, the higher the strength. If we add a water reducing agent to the concrete and reduce the water consumption at the same time to keep the fluidity unchanged, the water-binder ratio will decrease under the condition that the amount of cementitious material remains unchanged, thus increasing the strength of the concrete; Under the circumstance of reducing the amount of cementitious material at the same time, keeping the water-binder ratio and fluidity unchanged, the cementing material can be saved.
This method of using the pce based superplasticizer makes use of the properties of the pce based superplasticizer to change the mix ratio of the concrete, thereby increasing the strength of the concrete or saving cementitious materials.
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The impact of the Russia-Ukraine conflict on the supply and prices of commodities is widening, and commodity prices remain at high levels. There is still great uncertainty about the future price of the polycarboxylate superplasticizer ,polycarboxylic acid superplasticizer,pce based superplasticizer.
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