What should you pay attention to when adding water reducing agent to mortar? If you don’t understand, read here

Ready-mixed mortar is generally mixed with a certain amount of water-retaining and thickening materials. Water-retaining and thickening materials generally have strong water requirements, which increases the unit water consumption of the mortar and also affects the mechanical properties and performance of the mortar. Durability, therefore the cement slurry system needs to be dispersed using appropriate water reducing agents.

There are many types of water-reducing agents. Theoretically, lignin series, naphthalene sulfonate series, melamine series, sulfamate series, aliphatic series and polycarboxylate series can reduce water. All water-reducing agents can be used as dispersants in cement slurry systems, but these water-reducing agents not only have greatly different dispersing, plasticizing and reinforcing effects, but also have certain adaptability with the cement, fly ash, slag powder, etc. used.

More importantly, ready-mixed mortar is a mixture of multiple components with widely different proportions, especially the presence of thickeners, water-retaining agents and stabilizers, which greatly affects the reduction of The plasticizing and dispersing effect of aqueous agents.

Ready-mixed mortar is usually mixed with a certain amount of water-retaining and thickening materials. Water-retaining and thickening materials have strong water requirements, which increases the unit water consumption of the mortar and also affects the quality of the mortar. Mechanical properties and durability, therefore it is necessary to use appropriate water reducing agents to disperse the cement slurry system. There are many types of water-reducing agents. Theoretically, lignin-based, naphthalenesulfonate-based, melamine-based, sulfamate-based, aliphatic-based and polycarboxylate-based water-reducing agents can be used as cement slurries. The dispersant of the system is used, but these water reducing agents not only have greatly different dispersing, plasticizing and reinforcing effects, but also have certain adaptability with the cement, fly ash, slag powder, etc. used. More importantly, ready-mixed mortar is a mixture of multiple components with widely different proportions. Especially the presence of thickeners and water-retaining agents greatly affects the plasticizing and dispersing effect of the water-reducing agent. When a certain component of thickener or water-retaining agent exists in the aqueous solution phase, certain types of water-reducing admixtures not only fail to exert their desired plasticizing effect, but sometimes even make the mortar fluidity worse.

Therefore, when producing high-fluidity mortar and selecting a water-reducing agent, a large number of tests must be conducted to select the most suitable type of water-reducing agent and determine its optimal dosage.

When a certain component of thickener or water-retaining agent exists in the aqueous solution phase, certain types of water-reducing agents not only fail to exert their due plasticizing effect, but sometimes even cause the mortar to flow. Sex is worse. Therefore, when producing high-fluidity mortar and selecting a water-reducing agent, it is necessary to pass a lot of experimental verifications to select the appropriate type of water-reducing agent and determine the appropriate dosage.

</p