High performance water reducers and high-efficiency water reducers are the main products in the water reducer market and are widely used in modern concrete engineering. High performance water reducing agents mainly refer to polycarboxylate based water reducing agents, with a water reduction rate of over 25%. According to the setting time, they can be classified into early strength type, standard type, and slow setting type, which are currently high-end water reducing agent products; High performance water reducers have higher water reduction rates, better slump retention performance, smaller drying shrinkage, and certain air entraining properties compared to other types of water reducers. The raw materials used for preparation are non-toxic and harmless, making it a green and environmentally friendly material.

High efficiency water reducing agents are mainly naphthalene based water reducing agents, with a water reduction rate between 14% and 25%. According to the setting time, they can be classified into standard and slow setting types. The advantages of naphthalene based high-efficiency water reducing agents are high water reduction rate, minimal impact on the setting time of concrete, low air entrainment, relatively low price, and good composite performance with various additives; The disadvantage is that when used in pre mixed concrete, there is a significant loss of slump, reduced fluidity of the concrete, severe bleeding, and a tendency to cause bottom scraping and compaction.

The test results of slump, expansion, and apparent density of concrete mixtures mixed with high-performance water reducers and high-efficiency water reducers are shown in the table:

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