1. Water Retention
Water retention in plastering mortar is crucial. Hydroxypropyl Methylcellulose (HPMC) has a strong water retention capacity. After adding HPMC to plastering mortar, it can form a water-retaining network structure inside the mortar to prevent water from being absorbed or evaporated too quickly by the base. For example, when plastering on some dry bases, if there are no good water retention measures, the water in the mortar will be quickly absorbed by the base, resulting in insufficient hydration of cement. The existence of HPMC is like a “micro-reservoir”. According to relevant studies, plastering mortar with an appropriate amount of HPMC can retain moisture for several hours or even days longer than that without HPMC under the same environment. This gives cement enough time to undergo hydration reaction, thereby improving the strength and durability of the plastering mortar.
Appropriate water retention can also improve the working performance of plastering mortar. If the mortar loses water too quickly, it will become dry and hard to operate, while HPMC can maintain the plasticity of the mortar, so that construction workers have enough time to level and smooth the plaster mortar.
2. Adhesion
HPMC can significantly enhance the adhesion between the plaster mortar and the base. It has good bonding properties, which can make the mortar better adhere to the base surface such as walls and concrete. In practical applications, this helps prevent hollowing and falling of the plaster mortar. When HPMC molecules interact with the surface of the base and the particles inside the mortar, a bonding network is formed. For example, when plastering some smooth concrete surfaces, the plaster mortar with HPMC added can be more firmly bonded to the surface, improve the stability of the entire plastering structure, and ensure the quality of the plastering project.
For bases of different materials, HPMC can play a good bonding enhancement role. Whether it is masonry, wood or metal base, as long as it is in the place where plaster mortar is needed, HPMC can improve the bonding performance.
3. Workability
Improve workability. The addition of HPMC makes the plastering mortar more workable, and the mortar becomes softer and smoother, which is convenient for construction operation. Construction workers can spread and scrape the mortar more easily when applying it, reducing the difficulty and workload of construction. This is particularly important in large-scale plastering projects, which can improve construction efficiency and quality.
Anti-sagging. When plastering on vertical or inclined surfaces, plastering mortar is prone to sagging, that is, the mortar flows downward under the action of gravity. HPMC can increase the viscosity and consistency of the mortar and effectively resist sagging. It enables the mortar to remain in the applied position without sliding down or flowing and deforming, ensuring the flatness and beauty of the plastering. For example, in the plastering construction of the exterior walls of buildings, the plastering mortar with HPMC added can well adapt to the construction requirements of vertical walls, and the construction effect will not be affected by sagging.
4. Strength and durability
Since HPMC ensures the full hydration of cement, the strength of the plastering mortar is improved. The higher the degree of cement hydration, the more hydration products are generated. These hydration products are interwoven to form a solid structure, thereby improving the strength indicators of the mortar, such as compression and flexural strength. In the long run, this also helps to improve the durability of the plastering mortar.
In terms of durability, HPMC can also play a certain role in crack resistance. It reduces the occurrence of drying shrinkage cracks caused by uneven moisture by maintaining a uniform distribution of moisture in the mortar. At the same time, the water retention effect of HPMC enables the mortar to resist the erosion of external environmental factors during long-term use, such as preventing excessive penetration of moisture, reducing the damage to the mortar structure caused by freeze-thaw cycles, etc., thereby extending the service life of the plastering mortar.
Post time: Dec-13-2024