Will foaming when applying mortar cause hollowing?

S

Shamil

Member
The dry-mixed mortar sample is fine, but the mass-produced mortar will have a lot of dense bubbles popping up when applied with a trowel. Will this cause a hollow? Have you encountered this situation?

The water consumption is 145, the water retention rate is about 87% (it will still bubble and explode if it reaches 90%).
 
Luis said:
What about formula and raw material testing data?
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Sand fineness 2.5, 10% below 0.15, cement 120, coal ash 30, 1.0 fineness river sand 60, machine-made sand 790. Mortar fineness 2.0-2.2, 22-24% below 0.15.

The bulk density is 1800, and the water retention is 88%. After reducing the additives, the water retention is 85%, but there are still bubbles. When the additives are added, the water retention is 91%, and there are still bubbles on the shear wall, but other walls are fine. It takes half an hour to put on the wall. It began to bubble and crack laterally, but the bulk density was not high, and workers reported that the mortar was not heavy.
 
You don’t need to add additives. You can observe at the site. It will not affect the construction in winter. Your sand configuration is okay, and the quality is controllable. Don’t worry too much about individual data.
 
If it gets thicker, it will fall down. This is a physical phenomenon. It can only be improved through construction methods. It can be improved through formula, but it is not significant.
 
Even if the shear wall is sprayed with spray grout or brushed with an interface agent, it will cause bubbles. Either sprinkle water in advance or let workers puncture the bubbling areas and then repair them. There is no good way. If you want to adjust the ratio, use coarser machine-made sand. Or you can remove the fine sand and try using pure machine-made sand.
 
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