Plastering mortar wall bubbling, what is wrong?

[Ankur]

Plastering mortar wall bubbling, what is wrong?

 

[Shamil]

There are unstable materials in the mortar; there is a problem with the cementitious material and the sand.

 

[Allen]

There is a high possibility that plaster has something wrong.
It is similar to the previous alkali-aggregate reaction.

 

[Rony]

This usually happens later phase. You are using tailing sand, right? The underlying mortar must have burst out.

 

[Cassie]

It should be caused by active stone powder in the bottom cement mortar. Generally, the active matter will burst into dust after meeting with water in the later stage.

 

[Johnson]

I think it was because of the use of fly ash, which was caused by gypsum in the fly ash.

 

[Roy]

If you are using the AB compound type, you'd better replace it with a plasticizer and a two-component conditioning agent to adjust the amount according to the workers' on-site construction reactions.