What are the functions of concrete admixture?

The function of concrete admixture: 1, which can reduce the water consumption of concrete or increase the fluidity of concrete without increasing the water consumption. 2. The setting time of concrete can be adjusted. 3. Reduce bleeding and segregation, improve workability and water elutriation resistance. 4. It can reduce slump loss and improve the pumpability of pumped concrete. 5. Shrinkage can be reduced, which can be compensated by adding expansion agent.

Function of concrete admixture

1, which can reduce the water consumption of concrete or increase the fluidity of concrete without increasing the water consumption.

2. The setting time of concrete can be adjusted.

3. Reduce bleeding and segregation, improve workability and water elutriation resistance.

4. It can reduce slump loss and improve the pumpability of pumped concrete.

5. Shrinkage can be reduced, which can be compensated by adding expansion agent.

6, delay the early hydration heat of concrete, reduce the temperature rise speed of mass concrete, and reduce the occurrence of cracks.

7, improve the early strength of concrete, prevent negative temperature freezing.

8, improve the strength, increase the frost resistance, impermeability, wear resistance and corrosion resistance.

9, control the alkali-aggregate reaction, prevent steel corrosion, reduce chloride ion diffusion.

10, made of concrete with other special properties.

1 1, reducing the viscosity coefficient of concrete, etc.

After adding additives to concrete, the effects are different due to different varieties, most of which are physical effects, such as adsorption on the surface of cement particles to form an adsorption film, changing the potential and producing different suction or repulsion; Some will destroy the flocculation structure, improve the stability of cement diffusion system and improve the hydration conditions of cement: some can form macromolecular structure and change the adsorption state on the surface of cement particles; Some will reduce the surface tension and surface energy of water, and a few will directly participate in chemical reactions with cement to form new compounds.