The mechanism of thixotropic lubricant in mortar

Thixotropic lubricants are used in mortar to enhance its workability and ease of application. These lubricants work by reducing the frictional resistance between the mortar and the substrate during application, making the process easier and more efficient. The mechanism of thixotropic lubricants in mortar can be explained as follows:

1. Thixotropy: Thixotropic lubricants exhibit thixotropic behavior, which means that they have a reversible viscosity that decreases with applied shear stress. This means that when the mortar is mixed, the lubricant becomes more fluid, reducing the resistance to flow. When the shear stress is removed, the viscosity of the lubricant increases, increasing the resistance to flow and preventing sagging or slumping of the mortar.
2. Lubrication: Thixotropic lubricants act as a lubricant between the mortar and the substrate. This reduces the frictional resistance between the two surfaces, making the application of the mortar easier and smoother. This is particularly important in situations where the substrate surface is rough or porous, as it can reduce the risk of damage to the substrate or the mortar.
3. Adhesion: Thixotropic lubricants can also improve the adhesion of the mortar to the substrate by reducing the air entrainment and segregation of the mortar during application. This is achieved by reducing the viscosity of the mortar and allowing it to spread more evenly over the substrate surface. This can improve the overall bonding strength between the mortar and the substrate, reducing the risk of detachment or failure.

In summary, the mechanism of thixotropic lubricants in mortar is based on their thixotropic behavior, lubrication, and adhesion properties. Thixotropic lubricants reduce the frictional resistance between the mortar and the substrate, making the application of the mortar easier and smoother. They also improve the adhesion of the mortar to the substrate by reducing air entrainment and segregation, resulting in a stronger bond between the two surfaces. Thixotropic lubricants can improve the overall performance and durability of the mortar, resulting in a more efficient and effective construction process.