Hi,
We have an industrial roaster. Recently, we were doing maintenance and after pulling out the drum we've noticed that the mortar we've applied along the surface of the walling have developed a lot of cracks. The super-duty air-set refractory mortar we used is 47.03% Aluminum Oxide. My questions is should we be using a different kind of mortar that is specifically used for surface walling of the firebricks.
![[Hearth.com] Cracks on Surface Mortar](https://www.hearth.com/talk/attachments/img_0094-webp.218115/ "[Hearth.com] Cracks on Surface Mortar")
Thanks,
We have an industrial roaster. Recently, we were doing maintenance and after pulling out the drum we've noticed that the mortar we've applied along the surface of the walling have developed a lot of cracks. The super-duty air-set refractory mortar we used is 47.03% Aluminum Oxide. My questions is should we be using a different kind of mortar that is specifically used for surface walling of the firebricks.
Thanks,
