Methyl cellulose (MC) is used in dry mortar formulations in the construction industry due to its unique properties. Here are some effects of methyl cellulose in dry mortar:

1. Water Retention: Methyl cellulose acts as a water retention agent in dry mortar. It forms a protective film around cement particles, preventing rapid water loss during mixing and application. This extended water retention improves workability, adhesion, and hydration of the mortar, leading to better bond strength and durability.
2. Improved Workability: Methyl cellulose enhances the workability of dry mortar by improving its consistency and spreadability. It reduces drag and increases cohesiveness, making the mortar easier to mix, apply, and shape. This improved workability allows for smoother application and better coverage on substrates, resulting in reduced labor costs and enhanced productivity.
3. Enhanced Adhesion: Methyl cellulose improves the adhesion of dry mortar to various substrates, including concrete, masonry, wood, and metal. By forming a flexible and cohesive film, methyl cellulose enhances the bond strength between the mortar and the substrate, reducing the risk of delamination, cracking, or detachment over time.
4. Reduced Shrinkage and Cracking: Methyl cellulose helps minimize shrinkage and cracking in dry mortar by improving its cohesion and reducing water evaporation during curing. The presence of methyl cellulose promotes uniform hydration and particle dispersion, resulting in reduced shrinkage and improved dimensional stability of the mortar.
5. Controlled Setting Time: Methyl cellulose can be used to control the setting time of dry mortar by modifying its hydration kinetics. By adjusting the methyl cellulose content and grade, contractors can tailor the setting time to suit specific project requirements and environmental conditions, leading to better project scheduling and improved construction efficiency.
6. Enhanced Rheology: Methyl cellulose improves the rheological properties of dry mortar formulations, such as viscosity, thixotropy, and shear thinning behavior. It ensures consistent flow and workability under different application conditions, facilitating ease of pumping, spraying, or troweling. This results in more uniform and aesthetically pleasing finishes on walls, floors, or ceilings.
7. Improved Durability: Methyl cellulose enhances the durability of dry mortar by increasing its resistance to environmental factors such as freeze-thaw cycles, moisture ingress, and chemical exposure. The protective film formed by methyl cellulose helps seal the mortar surface, reducing porosity, efflorescence, and degradation over time, leading to longer-lasting and structurally sound construction projects.

the addition of methyl cellulose to dry mortar formulations offers several benefits, including improved water retention, workability, adhesion, durability, and performance. Its versatility and effectiveness make it a valuable additive in various construction applications, including tile fixing, plastering, rendering, and grouting.