What should I do since the self-leveling floor mortar cracks?

[Chanliss]

Cement 220
sulfoaluminate cement( rapid setting and hardening) 90
water reducing agent 1.5
antifoaming agent 0.7
retarders 1.0
fine sand 550
Limestone powder 150
anhydrite 5

 

[Cassie]

From the picture, the leveling of the sample could be better, obviously high in the middle and relatively low around the outside. Is there any layering?

 

[Roy]

More than water added is needed, causing the cracking of lack of fluidity.

 

[Chanliss]

From the picture, the leveling of the sample could be better, obviously high in the middle and relatively low around the outside. Is there any layering?

There is no layering or water, and the oil is brushed underneath.

 

[Cassie]

There is no layering or water, and the oil is brushed underneath.

How long? 24 hours?

It's like swelling or losing water too quickly; shrinking does not cause such a crack.

The usage of gypsum is too heavy, and I didn't see you use cellulose ether.

Do not brush oil on the glass, affecting the fluidity and adhesion. Cracking is normal without adhesion.

 

[Scott Kaplan]

You used a metal basin with brushed oil and then made a thin self-leveling layer. This method needs to be considered.