The surface of gypsum self-leveling is uneven; please help analyze it.

[Luis]

Gypsum 750. Cement 425. 50. Heavy Calcium Carbonate 200, cellulose ether 0.3-0.5, water reducing agent 2, antifoaming agent 0.8-1, suspending agent 0.3 retarders 0.3
Or gypsum 950 cement 50.
The same is true without adding calcium; the last is the smoothest.

 

[Chanliss]

Adding 3-5% micro-silica fume or 10% fine sand will improve the self-leveling mortar surface effect.

 

[Cassie]

The surface unevenness is due to the poor self-healing property of the mortar because there are coal ash impurities in the gypsum, which are formed when the surface is broken and can be solved by adding additives.

 

[Alex]

The matching of water-reducing agent and gypsum is essential, especially in the sand-free system, which can easily lead to poor healing or slight bleeding. The result is that the appearance looks poor after drying.

 

[Shamil]

Don't you use a water-reducing agent? Is there too much cellulose, and have you added suspending agent?

 

[Ankur]

Adjust the water-reducing agent and cellulose ether, and then find an excellent antifoaming agent that can be improved. The material itself mainly caused the issue.

 

[Roy]

Insufficient operating time

 

[Allen]

I feel that the additives do not match, and the amount of water needs to be adjusted.