classification of concrete water-reducing agents. concrete admixtures can be divided into four categories according to their main functions:
1. admixtures to improve the rheological properties of concrete mixtures: including various water reducing agents, air entraining agents, pumping agents, etc.
2. admixtures that adjust the setting time and hardening performance of concrete: including retarder, early strength agent, accelerating agent, etc.
3. admixtures to improve the durability of concrete: including air-entraining agents, waterproofing agents, and rust inhibitors.
4. admixtures to improve other properties of concrete: including air-entraining agents, expansion agents, antifreeze agents, colorants, waterproofing agents and pumping agents, etc.
according to the naming and definition of admixtures (gb8075-87), admixtures can be divided into 16 names, and their respective definitions are as follows:
1. ordinary water-reducing admixture: an admixture that can reduce mixing water consumption under the condition that the concrete slump is basically the same;
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 can introduce a large number of uniformly distributed, stable and closed micro-bubbles during the concrete mixing process;
5. high-efficiency water-reducing admixture: an admixture that can significantly reduce the water consumption of the mixture under basically the same conditions as concrete collapse;
6. early-strength water-reducing agent: a water-reducing agent with both early-strength and water-reducing functions;
7. retarding water-reducing agent: a water-reducing agent with both retarding and water-reducing functions;
8. air-entraining and water-reducing admixture: an admixture with both air-entraining and water-reducing functions;
9. waterproofing agent: an admixture that can reduce the water permeability of concrete under hydrostatic pressure;
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 and can form a large number of pores in the concrete;
12. expansion agent: an admixture that can cause a certain expansion in the volume of concrete;
13. antifreeze: an admixture that can harden concrete at negative temperatures and achieve sufficient antifreeze strength within a specified time;
14. colorants: admixtures that can prepare concrete with stable colors;
15. accelerating admixture: an admixture that can harden concrete quickly;
16. pumping agent: an admixture that can improve the pumping performance of concrete mixture
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