Hygroscopic expansion and late rebound of ceramic tiles
Due to the different properties of the glaze, such as the expansion coefficient and cooling rate, the glazed tile will have a certain downward curvature after firing, and it is not completely straight. Over time, the internal stress is released, the green body absorbs moisture and expands, and the brick will rebound to a certain extent until it is finally set. Saturated soaking water can accelerate the moisture absorption, expansion and shaping process of ceramic tiles, which not only makes the paving effect more beautiful, but also avoids problems such as hollowing and hollowing caused by later rebound.

This factor not only affects ceramic bricks with high water absorption, but also is critical for stoneware bricks. The common imitation wood-striped floor ceramic tiles on the market are mostly stoneware, and the size and specifications are narrow and long, and the probability of later deformation is greater. The soaking process before laying is very necessary.

cleaning brick foundation

Careful friends will find that there will be a layer of white powder attached to the back of the newly purchased ceramic tiles, which is the brick base powder. Some so-called popular science articles say that this is a mold release agent for presses, and it is poisonous when exposed to floor heating, which is completely made up. Brick bottom powder is a very high temperature resistant inorganic mineral, which is used to ensure that the ceramic tiles will not bond with the rollers at a high temperature of more than 1,000 degrees (to ensure that the bricks travel smoothly in the kiln). In the process of packing the box, the brick base powder plays a protective role on the glaze surface and avoids scratching the glaze surface on the back of the brick.

However, in the laying stage, if the brick base powder is thick, it is very unfavorable for the reliability of the paste. The soaking process will clean up the brick base powder, which is the same for porcelain ceramic tiles. If it is a porcelain tile that does not need to be soaked, and the size is large and inconvenient to soak in water, you can clean the brick foundation powder with a water pipe or a watering can. It is only necessary to clean up the excessively thick floating ash, and the white part that is closely combined with the brick will not affect the paving.

Prevention of dirt suction on the brick surface

Soaking the ceramic tiles with water is very meaningful to prevent the tile surface from absorbing dirt. Whether it is an impermeable base glaze or a green body with a lower water absorption rate, it can ensure that sewage will not penetrate from the back of the brick to a certain extent, but it will not work for the front of the brick.

Good ceramic ceramic tiles are very strict in the control of glazed pinholes. Polished products (polished ceramic tiles, polished glazed ceramic tiles) will add special surface coatings to the ceramic tiles in order to improve the antifouling ability. However, these cannot be 100% guaranteed that the brick surface will not absorb dirt. If the ceramic tiles are soaked in water in advance, even if there are micropores on the tile surface, they will be filled with clean water. Even if cement is accidentally applied to the tile surface, it can be easily wiped clean. For large-sized porcelain polished ceramic tiles and polished glazed ceramic tiles, it is best to spray a layer of water on the tile surface before laying, which can reduce a lot of trouble for later cleaning work.