1. Improving the water retention of mortar
Hydroxypropyl methylcellulose (HPMC) is an excellent water-retaining agent that effectively absorbs and retains water by forming a uniform network structure in the mortar. This water retention can prolong the evaporation time of water in the mortar and reduce the rate of water loss, thereby delaying the hydration reaction rate and reducing the volume shrinkage cracks caused by rapid evaporation of water. At the same time, longer open time and construction time also help to improve construction quality and reduce the possibility of cracks.
2. Improving the workability and rheology of mortar
HPMC can adjust the viscosity of mortar, making it easier to operate. This improvement not only improves the fluidity and workability of mortar, but also enhances its adhesion and coverage on the substrate. In addition, AnxinCel®HPMC can also reduce segregation and water seepage in mortar, make the components of mortar more evenly distributed, avoid local stress concentration, and effectively reduce the probability of cracks.
3. Enhance the adhesion and crack resistance of mortar
The viscoelastic film formed by HPMC in mortar can fill the pores inside the mortar, improve the density of the mortar, and enhance the adhesion of the mortar to the substrate. The formation of this film not only strengthens the overall structure of the mortar, but also has a blocking effect on the expansion of microcracks, thereby significantly improving the crack resistance of the mortar. In addition, the polymer structure of HPMC can disperse stress during the curing process of the mortar, reduce stress concentration caused by external loads or deformation of the substrate, and help prevent further development of cracks.
4. Regulate the shrinkage and plastic shrinkage of mortar
Mortar is prone to shrinkage cracks due to water evaporation during the drying process, and the water retention property of HPMC can delay water loss and reduce the volume shrinkage caused by shrinkage. In addition, HPMC can also reduce the risk of plastic shrinkage cracks, especially in the initial setting stage of the mortar. It controls the migration speed and distribution of water, reduces capillary tension and surface stress, and effectively reduces the probability of cracking on the mortar surface.
5. Improve the freeze-thaw resistance of mortar
The addition of HPMC can also enhance the freeze-thaw resistance of mortar. Its water retention and film-forming ability help reduce the freezing rate of water in mortar under low temperature conditions, avoiding the damage to the mortar structure due to the volume expansion of ice crystals. In addition, the optimization of the pore structure of mortar by HPMC can also reduce the impact of freeze-thaw cycles on the crack resistance of mortar.
6. Prolong the hydration reaction time and optimize the microstructure
HPMC prolongs the hydration reaction time of mortar, allowing cement hydration products to fill the mortar pores more evenly and improve the density of mortar. This optimization of microstructure can reduce the generation of internal defects, thereby improving the overall crack resistance of mortar. In addition, the polymer chain of HPMC can form a certain interaction with the hydration product, further improving the strength and crack resistance of mortar.
7. Enhance deformation resistance and energy absorption characteristics
AnxinCel®HPMC gives mortar a certain flexibility and deformation resistance, so that it can better adapt to the external environment when subjected to external forces or temperature changes. This energy absorption property is particularly important for crack resistance, which can reduce the formation and expansion of cracks and improve the long-term durability of mortar.
HPMC improves the crack resistance of mortar from many aspects through its unique water retention, adhesion and film formation ability, including optimizing the workability of mortar, reducing shrinkage and plastic shrinkage cracks, enhancing adhesion, extending the open time and anti-freeze-thaw ability. In modern building materials, HPMC has become an important admixture to improve the crack resistance of mortar, and its application prospects are very broad.
Post time: Jan-08-2025