Organic additives with rheological properties and water retention have good economic benefits in mortar industry. Polysaccharides, especially cellulose ether, are commonly used to retain water in mortar and have high levels.
Cellulose ether can significantly improve the internal strength and cementation degree of cement mortar in the final stage. These additives can greatly improve its water retention. They can prevent water from flowing too fast from mortar to the substrate. The water thus retained remains on the surface of the fresh material, facilitating the hydration of the cement and improving the ultimate mechanical properties. The most common cellulosic ethers used in construction are HEMC and HPMC.
Effects of MHEC and HPMC in Cement Plaster
1. Improve homogeneity, make the mortar more easily coated, and improve the anti-sagging ability. Enhance liquidity and pumpability, thus improving working efficiency.
2. High water retention, prolong the working time of mortar, improve work efficiency, and facilitate the formation of high mechanical strength during solidification period.
3. Control the infiltration of air, thus eliminating the microcracks of the coating and forming the ideal smooth surface.