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What are the classification of superplasticizer?

Release time:

2022-06-15

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　　SuperplasticizerWhat are the classifications?

The structure of the water reducing agent has hydrophilic branches, which extend in the aqueous solution, so that a hydrophilic three-dimensional adsorption layer with a certain thickness is formed on the surface of the adsorbed cement particles. So, what are the classification of superplasticizer?

　　SuperplasticizerWhat are the classifications?

1, mainly naphthalene, accounting for 67%. Especially in China, most of the water reducing agents are naphthalene series water reducing agents with naphthalene as the main raw material. Most naphthalene superplasticizer synthesis plants have the ability to control the Na2SO4 content below 3%, and some advanced enterprises can even control it below 0.4%.

2, naphthalene series high-efficiency water reducing agent is the current domestic production is larger, the application of a wide range of high-efficiency water reducing agent. It is characterized by high water reduction rate, no air intake, little influence on setting time, good adaptability to cement, and relatively cheap price. Naphthalene superplasticizer is commonly used in the preparation of high fluidity, high strength, high performance concrete.

3. The slump loss of concrete mixed with naphthalene water reducing agent is faster. In addition, the adaptability of naphthalene superplasticizer to some cement needs to be improved.

　　SuperplasticizerWhat are the characteristics?

1. High-efficiency water reducing agent has a strong distribution effect on cement, which can improve the fluidity of cement mixture and the slump of concrete to a large extent, and can greatly reduce water consumption. High-efficiency water reducing agent basically does not change the setting time of concrete. When the dosage is high, it slightly delays the setting, but does not delay the growth of early strength of hardened concrete.

Water consumption can be greatly reduced, thereby significantly improving the strength of concrete at all ages.

3, chloride ion content is very small, will not cause corrosion of steel. It can enhance the impermeability, frost resistance and corrosion resistance of concrete, and improve the durability of concrete.

　　SuperplasticizerWhat is the difference with ordinary water reducing agent?

The water reduction rate of ordinary water reducing agent is usually 5% ~ 10%, and the water reduction rate of high-efficiency water reducing agent can reach 12% ~ 25%, which may be higher.

　　2、SuperplasticizerThe workability of concrete can be greatly improved under the condition that the water-cement ratio remains unchanged. Under the condition of the same amount of cement, the slump of concrete mixed with ordinary water reducing agent is usually about 10cm.

3. Under the condition that the slump is basically the same, the superplasticizer can reduce the proportion of mixing water consumption and water cement ratio of concrete, thus greatly improving the strength of concrete. Therefore, the high efficiency water reducing agent is mainly used in the configuration of high strength grade, high water reduction requirements of the fluid concrete. The water reduction rate of ordinary water reducing agent is relatively low, which is mainly used for the preparation of concrete with low strength grade and low water reduction requirement.

4. From the cost of preparation, the solid content of polycarboxylate superplasticizer is high, so the price is relatively high; while the solid content of ordinary superplasticizer is low and the price is low.

5. Compared with ordinary water reducing agent, water reducing agent has better water reducing, water reducing and other functions of composite multifunctional water reducing agent, which has more advantages than single component synthetic water reducing agent, and can better meet the various requirements of fresh concrete and hardened concrete.

Key words:

Superplasticizer

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