Why are the tiles loose?

Customers often ask why loose tiles occur. There are many reasons for loose tiles, most of which are problems on the construction site that the customer doesn’t realize. For example, the construction of the wall is not clean; the wall is not enough to do the wetting, so that the grip of the mortar and the wall is reduced; the back of the tile is not clean, leaving a layer of ash, which will affect the bonding strength; incorrectly applying the mortar will also cause tiles to loosen.

In addition to construction site problems, there are some product quality problems, for example:

Tile water absorption rate failed

Water absorption may be too high, porcelain tile blank density is loose, easy to absorb water, tiles by thermal expansion and contraction will lead to surface cracking, and even the overall tile peeling. The water absorption rate is too low wall tiles because it is difficult to absorb the water in the cement mortar, the tiles and cement can not form a bond between the tiles, the chance of falling off will also greatly increase.

Improper choice of cement grade

Cement mortar grade indirectly affects its coagulation effect with tiles. The standard is not enough, the bond is not good, and the cement standard is too high, once the hydration exothermic fast, the water evaporates quickly, coupled with the ambient temperature gap is too large, then it is easy to produce cracks, bonding is not good easy to make the tiles loose or even fall off.

There is a reason is the cement mortar ratio is not right. Traditional paving is generally the use of cement and sand mixed on-site as a bonding agent, cement slurry contains water that can be absorbed by the tiles and cured, so as to form a tile grip on the wall. The key to this method of operation lies in the proportion of cement and sand. Incorrect ratios, too high a proportion of sand, or not adding adhesive (RDP) to the mortar or not adding enough will result in a cement mortar that won’t stick to the tiles. And if too high a proportion of water is added to the cement mortar, it will gradually detach from the tiles during drying. That’s why Kemox engineers are very careful in adding water when doing experiments, each time adding 200 grams of water first, then 20 grams, and finally may need to add 5 grams of water.

In addition, the quality of sand also has a relationship, the poorer quality of sand is prone to make the strength of the cement mortar deteriorate, and ultimately lead to the tiles hollowing out and falling off. About the sand will involve the problem of grading, generally choose a particle in the more moderate sand as the only additive can be. If you use different levels of sand from coarse to fine proportioning, the ratio is very important, the so-called gradation is to use different fineness of sand to fill the gap between each other, so as to achieve a more compact effect of the meaning.

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