According to the national standard GB8075-2005, 27 types of concrete admixtures are defined. They are:
1. Ordinary water-reducing admixtures: When the slump of concrete is basically the same, it can reduce Mixing water amount of admixture.
2. Early strength agent: an admixture that accelerates the early strength development of concrete.
3. Retarder: an admixture that prolongs the setting time of concrete.
4. Air-entraining agent: An admixture that introduces a large number of uniformly distributed, stable and closed micro-bubbles during the mixing of concrete.
5. High-efficiency water-reducing admixture: an admixture that can significantly reduce the amount of mixing water when the slump of concrete is basically the same.
6. Early-strength water-reducing admixture: an admixture with both early-strength and water-reducing functions
7. Retarded water-reducing admixture: an admixture with both retarding and water-reducing functions Admixtures
8. Air-entraining and water-reducing admixtures: Admixtures with both air-entraining and water-reducing functions
9. Waterproofing agents: Can reduce the water permeability of concrete under hydrostatic pressure of admixtures.
10. Rust inhibitor: An admixture that can inhibit or reduce the corrosion of steel bars or other embedded metals in concrete.
11. Air-entraining agent: An admixture that releases gas due to chemical reactions during the concrete preparation process, resulting in the formation of a large number of pores in the concrete.
12. Expansion agent: an admixture that can cause a certain volume expansion of concrete.
13. Antifreeze: An admixture that can harden concrete at negative temperatures and achieve sufficient antifreeze strength within a specified time.
14. Accelerating admixture: an admixture that can quickly solidify and harden concrete.
15. Pumping agent: an admixture that can improve the pumping performance of concrete mixtures.
16. Coagulant: an admixture that can shorten the coagulation time of the mixture.
17. Retarding and high-efficiency water-reducing admixture: an admixture that has both retarding and efficient water-reducing functions.
18. Colorant: an admixture that can prepare colored concrete
19. Water-retaining agent: an admixture that reduces water loss in mortar and concrete.
20. Flocculant: An admixture that can increase the viscosity of concrete and resist the separation of cement and aggregate during construction in water.
21. Thickener: an admixture that increases the viscosity of the concrete mixture.
22. Shrinkage reducing agent: an admixture that reduces the shrinkage of concrete.
23. Plastic retaining agent: an admixture that reduces the slump loss of concrete within a certain period of time.
There are other things that are not specified in the standards but have been widely used in projects:
Pumping antifreeze: an admixture with both pumping and antifreeze functions.
Pumpable waterproofing agent: an admixture with both pumping and waterproofing functions.
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