Sodium Carboxymethyl Cellulose, as one of the cellulose types with a wide range of uses and heavy usage, can be widely used in food, medicine, daily chemicals, construction, etc. due to its safety and reliability. So what are the applications of CMC in mortar?
- Lubricating ability. All air-entraining agents that act as wetting agents can lower the surface tension and help the fines in the mortar to disperse when mixed with water.
- Water retention. Sodium Carboxymethyl Cellulose prevents moisture from penetrating into the wall. An appropriate amount of water stays in the mortar, so that the cement has a longer time for hydration. The water retention is proportional to the viscosity of the cellulose ether solution in the mortar. The higher the viscosity, the better the water retention.
- Bubble content. High air bubble content results in better mortar yield and constructability, reducing crack formation. It also lowers the intensity value, resulting in a “liquefaction” phenomenon. Air bubble content usually depends on stirring time.
- Anti-sagging. A good sag-resistant mortar means that when applied in thick layers there is no danger of sag or downward flow. Sag resistance can be improved by building-specific Sodium Carboxymethyl Cellulose. In particular, the newly developed construction-specific CMC-Na can provide better anti-sag properties of mortar.
To sum up, according to the understanding of the role of CMC in mortar in its lubricating ability, water retention, air bubble content, and anti-sagging properties, when using CMC, it can provide convenience in use and is conducive to improving the efficiency of mortar use.
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