The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as buyers in Europe slowed in recent days for April, coupled with weaker-than-expected import demand from End users in China. According to China Coal Market net monitoring: Australia Newcastle port thermal coal price index was 253 USD/ton, compared with 309.02 USD/ton, down 56.02 USD/ton, down 18.13%. South Africa's Port Richards thermal coal price Index was $264.5 / mt, down the US $62.72 / mt or 19.17% from US $327.22 / mt. The European ARA Tri-port thermal coal price Index was $281.8 / ton. Does the price of thermal coal in major international ports continue to decline to affect the price of the superplasticizer for concrete admixture,superplasticizer used in concrete?
Superplasticizer used in concrete refers to the fact that after mixing, it can reduce the water demand of concrete under the condition of maintaining basically the same fluidity, thereby improving the strength and durability of concrete, or under the condition that the amount of cement used and the water-cement ratio remain unchanged , Add the admixture of concrete fluidity and improve concrete workability.
1. Lubrication effect: The polar hydrophilic groups in the concrete admixture superplasticizer are directionally adsorbed on the surface of the cement particles, and are easily associated with water molecules in the form of hydrogen bonds. The force of this hydrogen bond association effect far exceeds the molecular attraction between water molecules and cement particles. When the cement particles absorb sufficient water reducing agent, the surface layer of the cement particles forms a stable layer of solvated water by virtue of the association effect of R-SO3θ and the hydrogen bonds in the water molecules and the hydrogen bond association between the water molecules. The film plays a three-dimensional protective effect, blocks the direct contact between the cement particles, and plays a lubricating effect between the particles.
2. Wetting effect: After the cement is mixed with water, the surface layer of the particles is wetted by water, and its wet condition has a great influence on the characteristics of freshly mixed commercial concrete. amount that can be reduced.
3. Water reduction effect:After adding a superplasticizer to the commercial concrete, the water-cement ratio can be significantly reduced under the condition of maintaining fluidity. The water reducing rate of high-efficiency water-reducing agent can reach 10% to 25%, while the water-reducing rate of ordinary water-reducing agent is 5%-15%, and high-efficiency water-reducing agent is also famous for this. The reason for the water reducing effect is mainly because of the adsorption and dispersion effect of commercial concrete on the water reducing agent.
4. Plasticizing effect:After adding the polycarboxylate based superplasticizer to the commercial concrete, the fluidity can be added without changing the water-cement ratio. The usual water-reducing agent can increase the slump of freshly mixed commercial concrete by more than 10 cm under the condition that the amount of cement used remains unchanged.
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Trafigura, one of the world's largest metals traders, is to take a stake in a new company to supply car and battery makers in Europe with lithium from a refinery in the UK, the Financial Times reported. As part of the investment, Trafigura will seek raw material for Green Lithium, which plans to build a plant in the north of England capable of producing 50,000 tonnes a year and sell the finished superplasticizer for concrete admixture,superplasticizer used in concrete, etc. If you are looking for high-quality materials, please feel free to contact us and send an inquiry.
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