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how do pre-mixed mortar additives improve the performance of mortar?

March 3, 2022by admin0

Modified additives such as pre-mixed mortar additives: cellulose ethers, accelerating agent, Redispersible polymer powder, air-entraining agents, early-strength agents, water-reducing agents, etc., which need to be added separately according to engineering use, greatly improve the performance of ready-mixed mortar, physical and mechanical properties.

pre-mixed mortar additives Cellulose ether (HPMC, HEMC)

In the pre-mixed mortar, cellulose ether is a main additive that has a very low addition amount, but can significantly improve the performance of the wet mortar and affect the construction performance of the mortar. Reasonable selection of cellulose ethers of different varieties, different viscosities, different particle sizes, different degrees of viscosity and added amount, that will has a positive effect on improving the performance of dry mortar.
mortar (1)In the production of building materials, especially dry mix mortar, cellulose ether plays an irreplaceable role, especially in the production of special mortar (modified mortar), it is an indispensable and important part. Cellulose ether plays a role in water retention, thickening, delaying cement hydration power, and improving construction performance. The good water retention capacity makes the cement hydration more complete, can improve the wet tackiness of the wet mortar, increase the bonding strength of mortar, and opening time. The addition of cellulose ether to mechanical spraying mortar can improve the spraying or pumping performance of mortar, as well as the structural strength. Therefore, cellulose ether is being widely used as an important additive in ready-mixed mortar.
pre-mixed mortar additives

Redispersible polymer powder

Redispersible polymer powder is a powdered thermoplastic resin produced by spray drying and subsequent processing of polymer emulsions. It is mainly used in construction, especially dry mortar, to increase cohesion, adhesion and flexibility.

The role of the redispersible polymer powder in mortar: Redispersible polymer powder forms a film after being dispersed and acts as a second adhesive to enhance the adhesion; the protective colloid is absorbed by the mortar system and will not be destroyed by water after the film is formed or disperse twice; the film-forming polymer resin is distributed in the entire mortar system as a reinforcing material, thereby increasing the cohesion of the mortar.

Redispersible polymer powder in wet mortar can improve construction performance, improve fluidity, increase thixotropy and sag resistance, improve cohesion, extend opening time, enhance water retention, etc. After mortar is cured, it can improve tensile strength, enhance bending strength, reduce elastic modulus, improve deformability, increase material compactness, increase wear resistance, increase cohesive strength, reduce carbonization depth, reduce material water absorption, and make materials have excellent hydrophobicity.

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