Precautions during use of superplasticizer additive
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 superplasticizer additive,pce superplasticizer.
What is superplasticizer additive?
After the pce superplasticizer is added to the cement, the sodium aluminate and sodium carbonate in its main components react rapidly with the gypsum in the cement to form sodium sulfate in the alkaline solution, so that the gypsum loses its original retarding effect, so that the calcium aluminate mineral rapidly Hydration, and precipitate its hydration product crystals in the solution, so that the cement concrete rapidly coagulates.
Plasticizer and superplasticizer in concrete Notes:
1. Please do not add this product when mixing materials. Because stones and sand contain a lot of water, the concrete superplasticizer absorbs water in a short period of time and decomposes its quick-setting components, which affects the setting time, reduces the strength of concrete, and reduces the poor concrete quality. Effect.
2. Before use, a trial mix test should be carried out for the type of cement used in the project, and the dosage should be selected before it can be used in large quantities. Expired cement cannot be used, and cement that does not meet national standards cannot be used. The concrete water reducing agent is required to be properly stored to prevent the failure of moisture agglomeration. Strengthen early maintenance to ensure later strength. Strictly good water-cement ratio. For projects with water seepage and leakage, the dosage must be increased.
PCE superplasticizer is a kind of concrete admixture that can be mixed with water under the condition that the slump of concrete remains basically unchanged. Most of them are anionic surfactants, such as lignin sulfonate, naphthalene sulfonate formaldehyde polymer, etc. After adding to the concrete mix, it has a dispersing effect on the cement particles. Can its workability, unit water consumption, fluidity of concrete mixture; or unit cement consumption, saving cement.
Concrete superplasticizer additive is a kind of admixture that can meet the necessary unit water consumption in concrete, and can specify the consistency requirements and workability of concrete. When mixing concrete, adding an appropriate amount of water reducing agent can make the cement particles disperse evenly, and at the same time release the water wrapped by the cement particles, so that the water consumption of the concrete can be significantly increased.
1. Hydration efficiency, unit water consumption, water-cement ratio, concrete strength, concrete construction performance, saving cement consumption;
2. The workability of concrete that has not yet solidified to prevent the segregation of concrete components;
3. Impermeability, water-reducing and water-permeability, avoiding water leakage in concrete building structures, durability, chemical corrosion resistance;
4. The shrinkage rate of concrete solidification to prevent cracks in concrete components;
5. frost resistance, conducive to winter construction.
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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 superplasticizer additive,pce superplasticizer.