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Whatis the concrete admixtures

Concrete mixes are substances that are added to improve and regulate the performance of concrete. More and more attention is paid to the application of the concrete mixes in the technique. The addition of admixtures plays a role in improving the performance of concrete, but the choice, method of addition and adaptation have a significant impact on its development.

concrete admixtures

Concrete mixes are divided into four categories according to their main functions:

  • Mextures to improve the rheological properties of concrete mixes. Including various water reducing agents, air importing agents and pumping agents and so on.
  • Mixtures to regulate the setting time and hardening properties of concrete. Including retardants, early force agents and accelerators.
  • Mextures to increase the stability of concrete. Including airborne agent, waterproofing agent and rust inhibitor and so on.
  • Mixtures to improve other properties of concrete. These include air intake agent, expansion agent, dyeing agent, antifreeze agent, water repellent agent and pumping agent and so on.

Initially, the mixture was used only to save cement. With the development of construction technology, composite construction has become a key measure to improve concrete performance.

concrete admixtures

Thanks to the superplasticizer, high-wave concrete, self-supporting concrete, high-strength concrete are processed; Thanks to the thickening, the properties of the submerged concrete are improved: thanks to the retarder, the normal life of the cement is extended, the leakage losses can be reduced and the construction period can be extended: at the expense of antifreeze, freezing point. the solution can be reduced, otherwise the deformation of the crystalline structure of the ice does not cause freezing damage. 

In conditions of negative temperature the construction can be completed.
In general, mixtures have the following effects to improve the properties of concrete:

  • Concrete water consumption can be reduced. Or the liquid of the concrete can be increased without increasing the water consumption.
  • The setting time of the concrete may be adjusted.
  •  Reduction of bleeding and discharge. Improve water usability and durability.
  •  It can reduce degradation losses and increase the pumping capacity of the concrete pump.
  •  The reduction can be reduced. The addition of an expanding agent can also compensate for the reduction.
  • The thermal delay of the initial hydration of the concrete, reducing the rate of increase of the mass temperature of the concrete and reducing the occurrence of cracks.
  • Improve the early strength of concrete and prevent freezing at negative temperatures.
  •  Improved strength, increased frost resistance, impermeability, silk resistance and corrosion resistance.

After the addition of admixtures to concrete, due to different types, the effects are also different, most of which are physical effects, such as adsorption on the surface of cement particles to form an adsorption film, changing the potential resulting in different absorption or reversal; some are disrupted The flocculation structure can improve the stability of the cement diffusion system and improve the hydration conditions of the cement: some can form a macromolecular structure and change the state of adsorption on the cement particles; some can reduce surface tension and water surface energy, etc .: several are directly involved in chemical reactions to produce new compounds with cement.

Because this mixture can improve the efficiency of concrete work and has good economic benefits, it has been widely used in many countries and has become a necessary material in concrete. 

Especially the use of high-efficiency water reducers. Cement particles can be completely dispersed, water consumption is greatly reduced and the cement capacity is fully utilized. As a result, the cement stone is relatively dense and the structure of the holes and the microstructure of the interface area are improved so that the physical and mechanical properties of the concrete are greatly improved, whether it is water permeability, ion chloride diffusion. , carbonization, sulfate resistance, impact resistance, wear resistance and other aspects are better than concrete without admixtures.

Not only improves the strength, but also improves the serviceability. It can also improve the stability of concrete. Only by mixing superplasticizers can high-performance, high-strength and high-strength concrete be made.

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