Two classifications of concrete admixtures and explanations of 16 admixture terms

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