In terms of flexural and compressive strength, under the condition of constant water-cement ratio and air content, the amount of latex powder has a strong influence on the flexural and compressive strength of cement-based floor materials. With the increase of latex powder content, the compressive strength decreased slightly, while the flexural strength increased significantly, that is, the folding ratio (compressive strength/flexural strength) gradually decreased. This reflects that the brittleness of self-leveling floor materials decreases significantly with the increase of latex powder content. This will lower the modulus of elasticity of the self-leveling floor material and increase its resistance to cracking.
In terms of bond strength, since the self-leveling layer is a secondary additional layer; the construction thickness of the self-leveling layer is usually thinner than that of ordinary floor mortar; The leveling layer needs to resist the thermal stress from different materials; sometimes self-leveling materials are used for special properties such as base surfaces that are difficult to adhere to: Therefore, even with the auxiliary effect of interface treatment agents, in order to ensure that the self-leveling layer can be firmly attached to the surface for a long time On the base layer, adding a certain amount of latex powder can ensure long-term and reliable adhesion of the self-leveling material.
Regardless of whether it is on an absorbent base (such as commercial concrete, etc.), an organic base (such as wood) or a non-absorbent base (such as metal, such as a ship deck), the bond strength of the self-leveling material varies with the amount of latex powder. Taking the form of failure as an example, the failure of the bond strength test of the self-leveling material mixed with latex powder all occurred in the self-leveling material or in the base surface, not at the interface, indicating that its cohesiveness good.
Post time: Mar-09-2023