Effect of HPMC cellulose ether on the performance of self-leveling mortar

Effect of HPMC cellulose ether on the performance of self-leveling mortar

1.Cellulose ether can improve the water retention of self-leveling mortar. With the increase of the amount of cellulose ether, the water retention of mortar is gradually enhanced, and at the same time, the fluidity and setting time of mortar are reduced to a certain extent. Excessive water retention will make the The porosity in the hardened mortar increases, which may cause a significant loss of the compressive and flexural strength of the hardened mortar. In the research, when the dosage is between 0.02% and 0.04%, the strength is significantly reduced, and the more the amount of cellulose ether is used, the more obvious the retarding effect is. Therefore, when using cellulose ether, it is necessary to comprehensively consider the mechanical properties of self-leveling mortar, reasonably select the dosage and its synergistic effect with other chemical materials.
2.The use of cellulose ether will reduce the compressive strength and flexural strength of cement paste, and will increase the bonding strength of mortar. Analysis of the reason for the change of strength is mainly caused by the change of microscopic products and structure. On the one hand, the cellulose ether rubber powder particles are first adsorbed on the surface of cement particles to form a latex film, which delays the hydration of cement, which will cause the early loss of strength; on the other hand, it is also due to the film-forming effect and water retention effect, which is conducive to the complete hydration of cement and the improvement of bond strength. The author believes that the changes of these two intensities mainly exist on the boundary of the condensation period, and the advance and delay of this boundary may be due to
A more in-depth and systematic study of this critical point will help to better control and analyze the hydration process of the cementitious material in the slurry, and will help according to the requirements for the mechanical properties of the mortar. Adjust the amount of cellulose ether and curing time to improve the performance of mortar.

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