Importance of HPMC to Mortar Water Retention(1)
Ⅱ. Traditional water retention methods
The traditional solution is to water the base, but it is impossible to ensure that the base is evenly moistened. The ideal hydration goal of cement mortar on the base is: the cement hydration product penetrates into the base along with the process of the base absorbing water, forming an effective “key connection” with the base, so as to achieve the required bond strength.
Watering directly on the surface of the base will cause serious dispersion in the water absorption of the base due to differences in temperature, watering time, and watering uniformity. The base layer has less water absorption and will continue to absorb the water in the mortar. Before the cement hydration proceeds, the water is absorbed, which affects the cement hydration and the penetration of hydration products into the matrix.
The water absorption of the base layer is large, and the water in the mortar migrates slowly to the base layer, and even a water-rich layer is formed between the mortar and the substrate, which also affects the bonding strength. Therefore, using the common base watering method will not only fail to effectively solve the problem of high water absorption of the wall base. But will affect the bonding strength between the mortar and the base, resulting in hollowing and cracking.
Ⅲ. The role of efficient water retention
The water retention performance of HPMC has many advantages:
1. The excellent water retention performance of HPMC makes the mortar open for a longer time, and has the advantages of large-area construction, long service life in the barrel, and batch mixing and batch use.
2. The water retention performance of HPMC makes the cement in the mortar fully hydrated, effectively improving the bonding performance of the mortar.
3. The excellent water retention performance of HPMC makes the mortar less prone to segregation and bleeding, which improves the workability and constructability of the mortar.
The HPMC produced by Landcel has good water retention, and different models can adapt to different mortar constructions with good results. Welcome to consult and get samples for free.
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