according to (gb8075-87) classification, concrete admixtures can be divided into four categories according to their main functions:
admixtures that improve the rheological properties of concrete mixtures: including various water reducing agents, aerosol and pumping agents, etc.
admixtures that adjust the setting time and hardening performance of concrete: including retarder, early strength agent, accelerating agent, etc.
admixtures that improve the durability of concrete: including air-entraining agents, waterproofing agents, and rust inhibitors.
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:
ordinary water-reducing admixture: when concrete collapses admixtures that can reduce the amount of mixing water under basically the same conditions;
early strength admixtures: admixtures that accelerate the early strength development of concrete;
retarders: extend the setting time of concrete admixtures;
air-entraining agents: admixtures that can introduce a large number of evenly distributed, stable and closed micro-bubbles in the process of mixing concrete;
high-efficiency water-reducing admixtures: in concrete an admixture that can significantly reduce the water consumption of the mixture under basically the same conditions of collapse;
early-strength water-reducing agent: a water-reducing agent with both early-strength and water-reducing functions;
retarded water-reducing admixture: a water-reducing agent with both retarding and water-reducing functions;
air-entraining water-reducing admixture: an admixture with both air-entraining and water-reducing functions;
waterproofing agent: an admixture that can reduce the water permeability of concrete under hydrostatic pressure;
rust inhibitor: an admixture that can inhibit or reduce the corrosion of steel bars or other embedded metals in concrete;
air-entraining agent: an admixture that releases gas due to chemical reactions during the preparation of concrete and can form a large number of pores in the concrete;
expansion agent: an admixture that can cause a certain expansion of the volume of concrete. agent;
antifreeze agent: an admixture that can harden concrete at negative temperatures and achieve sufficient antifreeze strength within a specified time;
coloring agent: can prepare concrete with stable color admixtures;
accelerating admixtures: admixtures that can harden concrete quickly;
pumping agents: admixtures that can improve the pumping performance of concrete mixtures. </p
