Post Date:7,Aug,2023

1.Setting time
Cellulose ether has a certain retarding effect on mortar. As the content of cellulose ether increases, the setting time of the mortar also prolongs. The retarding effect of cellulose ether on cement slurry mainly depends on the degree of substitution of alkyl, and is not closely related to its molecular weight. The lower the degree of alkyl substitution, the greater the hydroxyl content, and the more obvious the retarding effect. Moreover, with a high content of cellulose ether, the complex film layer has a more significant effect on delaying the early hydration of cement, therefore, the retarding effect is also more obvious.

2.Bending strength and compressive strength
Usually, strength is one of the important evaluation indicators for the curing effect of cement-based cementitious materials on mixtures. The increase in the content of cellulose ether will reduce the compressive strength and flexural strength of the mortar.

3. Bond strength
Cellulose ether has a significant impact on the bonding performance of mortar. Cellulose ether forms a polymer film with a sealing effect between cement hydration particles in the liquid phase system, which promotes a greater amount of water in the polymer film outside the cement particles, which is conducive to the complete hydration of cement, thereby improving the bonding strength of the hardened slurry. At the same time, an appropriate amount of cellulose ether enhances the plasticity and flexibility of the mortar, reducing the rigidity of the transition zone between the mortar and the substrate interface, and reducing the sliding ability between the interfaces. To some extent, it enhances the bonding effect between mortar and substrate. In addition, due to the presence of cellulose ether in the cement slurry, a special interface transition zone and interface layer are formed between the mortar particles and hydration products. This interface layer makes the interface transition zone more flexible and less rigid, thus giving the mortar strong bonding strength.