Gypsum-based self-leveling mortar oil slick on the surface, seeking a solution

[Scott Kaplan]

Currently doing gypsum-based self-leveling mortar.

Gypsum powder: 900; 425 cement: 50; Heavy Calcium Carbonate；50; water reducer: 2.5; antifoaming agent: 1; 400E: 0.6; retarder：1.2; water consumption 35%

 

[Luis]

There are a lot of impurities in the gypsum powder. You can directly add water and stir the gypsum to see the surface condition. If it doesn't work, add some stabilizer and try it.

 

[Chanliss]

Oily antifoaming agent are prone to such a state, so change to other kind antifoaming agent.

 

[Cassie]

It looked like it was bleeding, and some light impurities, such as coal ash, floated up. Gently scrape the surface to see if the bottom color is uniform; if so, try to increase the cellulose ether or add some stabilizer.

Then reduce the antifoaming agent a little, and try other kinds.

Take one step at a time.

 

[Alex]

It’s a bit bleeding once the impurities in the bleeding gypsum will float out; the upstairs said to try to add stabilizers and increase the amount of cellulose ether, and you can also try to use finer Heavy Calcium Carbonate.

 

[Shamil]

Is there any impurity in phosphogypsum?

 

[Ankur]

The powder is not enough, and there will be no oil slick problem if you add Heavy Calcium Carbonate and silica fume.

 

[Roy]

The powder is not enough, and there will be no oil slick problem if you add Heavy Calcium Carbonate and silica fume.