What happens when plastering mortar walls appear beads?

[Scott Kaplan]

What happens when plastering mortar walls appear beads?

 

[Luis]

I have never encountered it before. The sand is not pure enough, or there are some foreign matters?

 

[Roy]

Is there pulverized lime in the cement? It may be the reason.

 

[Allen]

This is called a blister. There are unstable materials in the mortar. It might the problem of cementing materials, and possibly the problem of sand.

 

[Cassie]

There is a high possibility that there is something wrong with the plaster.
An alkali-aggregate reaction is similar to the previous structure.

 

[Rony]

This situation usually results in an ash explosion in the later stage. You have used the tailings, don’t you?

 

[Johnson]

This situation usually results in an ash explosion in the later stage. You have used the tailings, don’t you?

This is correct. It was the underlying mortar that exploded.

 

[Ankur]

It should be caused by the active stone powder contained in the underlying cement mortar. Active substances generally explode when exposed to water at a later stage.

 

[Shamil]

Using sodium gluconate to adjust the setting time will cause the problem of slow strength. It takes 3 days for the inner wall and 10 days for the outer wall. The surface strength will be lost if the maintenance is not good.