What Are Superplasticizers?

Under the condition that the slump of the concrete is basically the same, the admixture that can greatly reduce the amount of mixing water is called high-efficiency water reducing agent.

Superplasticizer

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Under the condition that the slump of the concrete is basically the same, the additive that can greatly reduce the amount of mixing water is called

The first generation of superplasticizersnaphthalene-based superplasticizers and melamine resin-based superplasticizers were developed in the early 1960s.

The water reduction rate of high-efficiency water reducing agent can reach more than 20%. Mainly naphthalene series,

The high-efficiency water reducing agent has a strong dispersion effect on the cement, which can greatly improve the fluidity of the cement mixture and the slump of the concrete. At the same time, it can significantly reduce the water consumption and significantly improve the workability of the concrete. However, some high-efficiency water-reducing admixtures will accelerate the slump loss of concrete, and if the content is too large, water will leak. High-efficiency water-reducing admixtures do not change the setting time of concrete. When the dosage is large (super-dose), it slightly retards the setting, but does not delay the early strength increase of the hardened concrete.

Can greatly reduce water consumption and significantly increase the strength of concrete at all ages. When the strength is kept constant, the cement can be saved by 10% or more.

The content of chloride ion is very small, and it does not cause rusting effect on the steel bar. It can enhance the impermeability, freeze-thaw resistance and corrosion resistance of concrete, and improve the durability of concrete.

It is suitable for precast and cast-in-situ reinforced concrete in various industrial and civil construction, water conservancy, transportation, port, municipal and other projects.

Suitable for high-strength, ultra-high-strength and medium-strength concrete, as well as concrete that requires early strength, moderate frost resistance, and high fluidity.

Precast concrete members suitable for steam curing.

It is suitable for making water reducing and strengthening components (ie master batch) of various compound admixtures.

The technical requirements for superplasticizers and retarding superplasticizers are specified in "Concrete Additives" (GB8076-2008).