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

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 

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.

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.

RDP shipment

Superplasticizer

Superplasticizer (Water reducing agent) refers to an additive that can reduce the amount of water used for mixing while keeping the consistency of the mortar basically the same. Superplasticizer are generally surfactants, which are classified according to their functions: ordinary Superplasticizer, high-efficiency Superplasticizer, early strength Superplasticizer, retarding water-reducing agents, retarding high-efficiency water-reducing agents and entrained water-reducing agents, etc.

The water-reducing agent used for ready-mixed mortar is required to be powdery and dry. Such water-reducing agent can be evenly dispersed in dry-mixed mortar without reducing the shelf life of ready-mixed mortar. At present, the application of water reducing agent in ready-mixed mortar is generally in cement self-leveling, gypsum self-leveling, batch scraping mortar, waterproof mortar, putty, etc. The selection of water reducing agent should be based on different raw materials and different mortar properties.

Pre-mixed mortar additives include retarders, accelerating agent, fibers, thixotropic lubricants, defoamers, etc., according to different types of mortars to select different additives. These additives are used in ready-mixed mortars. The improvement in performance is like a seasoning for cooking food. It is added to the dishes to brighten the color, increase the taste and lock the nutrition, so that different types of ready-mixed mortars can exert better quality capabilities. It is magic weapon for better use of ready-mixed mortar in the engineering.