The effect of dispersible polymer powder on self-leveling mortar

a. Enhanced Performance:

The incorporation of polymer binders in the form of dispersible polymer powders brings about a remarkable enhancement in the characteristics of self-flowing floor mortars. 

This transformation is accomplished through the modification of cement mortar using redispersible polymer powder. Typically, such mortar formulations comprise mineral binders 

like cement, alumina cement, or anhydrite, a significant quantity of other inorganic constituents, and varying amounts of dispersible polymer powders. Several crucial properties of 

self-leveling floor mortars have been noticeably upgraded, and this is contingent upon the dosage of the dispersible polymer powder.

b. Tensile Bond Strength with the Substrate:

The excellence of a self-leveling floor is highly reliant on its adhesive power to the base. Maissen dispersible polymer powders guarantee that self-leveling mortars possess an outstanding 

bonding performance. The greater the concentration of dispersible polymer powder, the more tenacious the mortar's adhesion to the substrate. Even when dealing with challenging-to-bond 

substrates such as wood or metal, self-leveling mortar with an appropriate amount of dispersible polymer powder can attain a satisfactory bonding effect. Moreover, the dispersible polymer 

powder augments the plasticity of the mortar, thereby ensuring reliable substrate bonding even in the face of pressure arising from differential thermal expansion coefficients and substrate 

movement.

c. Compressive and Flexural Strengths:

Similar to the improvement in bond strength, the addition of dispersible polymer powder can enhance the flexural strength of self-leveling mortar. This effect becomes more pronounced as 

the polymer binder forms an organic connection between the filler and the products of cement hydration, augmenting the material's cohesion and consequently increasing its flexural strength. 

In contrast, increasing the polymer content may sometimes lead to a reduction in compressive strength. Since the compressive strength of the material is related to its density, if the addition serves 

to decrease the air content of the system, the compressive strength of the system will rise. However, if the air content and water-to-ash ratio remain unaltered, the addition of polymer diminishes the 

compressive strength.

d. Tensile Strength:

The deformability of polymer-modified self-leveling mortar can be exhibited through tensile tests. A higher polymer content corresponds to greater tensile strength and elongation at break. The enhanced deformability mitigates the risk of material cracking and is beneficial in compensating for applied stresses. For instance, polymer-modified mortars can better absorb the stress induced by coating drying and 

the deformation of the subfloor in self-leveling mortar applications.

e. Wear Resistance of Self-Leveling Mortar:

Owing to the modification and augmentation by the dispersible polymer powder, the material's deformation capacity is improved, which also contributes to compensating for the wear resistance of the material's performance. This empowers the material to preserve its mechanical properties when subjected to rolling or being traversed by a motor vehicle wheel.

Name: Crystal.Cui

E-Mail:crystal.cui@jtdf-rdp.com

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