(1) Inorganic admixtures: including various inorganic salts, some metal elements and a small amount of hydroxides. Such as calcium chloride and sodium sulfate in early strength agents, aluminum powder in air-entraining agents, sodium hydroxide in waterproofing agents, etc.
(2) Organic admixtures: This type of admixtures account for the vast majority of concrete admixtures. There are many types, most of which belong to the category of surfactants, including anionic, cationic and nonionic surfactants, such as lignin sulfonate, caisinate sulfonate formaldehyde condensate in water reducing agents, etc. There are some organic admixtures that do not have surface-active effects on their own, but can be used as high-quality admixtures.
(3) Composite additives: Admixtures made of appropriate inorganic and organic compounds often have multiple functions or significantly improve a certain performance. , which is the embodiment of "synergistic effect" in admixture technology and one of the development directions of admixtures.
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