Ordinary dry mixed mortar
The addition of cellulose ether in ordinary dry mixed mortar is very low, but it can significantly improve the performance of wet mortar, which is a main additive affecting the construction performance of mortar. Reasonable selection of cellulose of different varieties, different viscosity, different particle size, different viscosity degree and addition amount has a positive influence on the improvement of the performance of dry powder mortar. At present, many policies and plasters mortar water retention performance is not good, slightly standing for a few minutes will appear water slurry separation, water retention is an important performance of methyl cellulose acid, but also a lot of domestic dry mortar wide home, especially in the south of the high temperature area of wide concern. The factors that affect the water retention effect of dry powder mortar include the amount of HPMC added HPMC viscosity, particle fineness and the temperature of the use environment
Cellulose ether water retention: In building materials, especially in the production of dry mortar, cellulose ether plays an irreplaceable role, especially in the production of special mortar (modified mortar), is an indispensable and important part. The important role of water-soluble cellulose ether in mortar mainly has three aspects, one is excellent water retention ability, the second is the impact on the consistency and thixotropy of mortar, and the third is the interaction with cement. The water retention effect of cellulose ether depends on the water absorption of the base, the composition of the mortar, the thickness of the mortar, the water requirement of the mortar, and the setting time of the set material. The water retention of cellulose ether comes from the solubility and dehydration of cellulose ether itself.
Factors affecting the water retention of mortar include cellulose viscosity, adding amount, particle fineness and use temperature. Generally speaking, the higher the viscosity, the better the water retention effect. But the higher the viscosity, the higher the molecular weight of HPMIC, its solubility will be reduced accordingly, which has a negative impact on the strength and construction performance of sand home. The higher the viscosity is, the higher the mortar increases, but the total is not on the half system of new degree I high construction, I am now sent to the knife and its test piece is not high, the knot gauge is not obvious when T is applied, the anti-sagging performance is not obvious. On the contrary, some modified methyl cellulose ether with medium and low viscosity showed excellent performance in improving the structural strength of wet mortar. In the Puyong dry source home, the cellulose resistance to water conservation, extended water distribution of hydration power, improve the construction performance. Good water retention ability makes water pie hydration more complete. Can improve the social nature of wet secrets, improve the flying. The addition of cellulose to a mechanical coating can improve the spraying or pumping properties of mortar, as well as the structural strength. Therefore, cellulosic acid is widely used as an important additive in ordinary dry mixed mortar
