4,The reason to form the water spot

The reason to form the water spot, it is very complicated, under different environment the water spot on the stone also different.  Most of them are because of cement mortar, cement add-in material,  acid rain. Under several kind of factors, it form the cement silicic acid gel, saline-alkali etc water absorb material. Strictly to say, if water enter into the stone pore directly, it can not be called as water spot, as the stone will be dried if no more water go into, but if in damp, the water absorb material of cement mortar will go it stone pore, thus come out the true water spot.

The reasons to cause water spot become pathological changes

(1) Adhesive to stick the stone during installation

The alkali content of the cement is too high, or use improper cement add-in

(2) during installation, use too much water

during installation, in order to combine mortar and stone tight, rubber hammer often to be used to hammer them to be solid. While when apply the cement on the stone, it could not reach to same density, so when hammer could make the water flow to the other portion where the density is lower, therefore, the water spot often come into being in the stone location where the cement mortar is not so density.

(3) The density difference exist in stone itself
Due to different content, the different situation for the stone to come into being, different stone with great different density. If the stone density and stone pore is different, its water absorbability also different.  If density is high, the water absorbability is low, if the density is low, the water absorbability is high, and if the water absorbability is higher, then it is easier to have the water spot.

(4) Maintenance not proper
Some stone manufacture clean the stone slab directly with acid, alkali due to some purpose, the remaining acid react with some oxide in the cement, and form a kind of solution salt, which absorb the water and produce the water spot, and the remaining alkali could absorb the water directly and get water spot.

(5) Environment reason
If the environment of the stone exist water or the stone is under continuous raining, then it will be easier to get the water spot.
If stone contact damp area directly or indirectly, then will get the water spot, if stone get wet all the time, then the gel material in the cement mortar and the solubility saline-alkali could move continuously through stone with water, and gather on the stone surface thus to become the water spot. If stone is damp or get wet, it will make the water spot more seriously, because more water, then the gel material of cement mortar and the solubility saline-alkali will easier to get through the stone, and its gathering on the stone surface is more
In addition, because of environment pollution, the stone part area the color become darker, and it looks like water spot.

5,Prevention for water spot’s pathological changes
Although it is difficult to solve the wet spot’s pathological changes, but there is some way to avoid it occurrence of the wet spot’s pathological changes, details as following:

before the installation, use specialized protection material to care the stone, especially care the bottom face of stone. when install the stone, try best to avoid too much water, it is better to use half dried cement mortar. to stick the stone, try best to adopt applying the mortar, and avoid the spraying mortar on the half dried mortar When install the stone, had better to leave some channel for water vapor, after installation, keep the space for stone slot, one week later, process the slot filling. before installing the stone, try best not to let the stone to be wet or be rained (especially after installation, 2 or 3 weeks is prohibited to be wet) .

6,How to process pathological changes of water spot
The reason and factors to cause water spot, it is very complicated, under different environment, the reasons are also different. Water spot is called as stone’s cancer, want to clear water spot completely, it is rather difficult, so the best way is to prevent.

(1) Physical baking
This method mainly adopt high temperature high heat to dry out the water contain in the alkali-silicon gel, after it become solid gel, use stone protection material to do the anti-water treatment. But this kind of method treat the stone surface only, so after alkali-silicon become solid, it will absorb water from stone bottom and around, and form new water spot again. The tool are sunlight or fire sprayer.

(2) Chemical clearance
This kind of method mainly use the stone water spot detergent to clean, spoil the alkali or Silicic acid gel (C-S-H), make it lose the ability to absorb water, thus to reach the aim to solve it.

(3) Clean+baking method
Use the stone water spot detergent to clean or spoil the Silicic acid gel (C-S-H), and then use baking method to dry to water in the stone.

(4) Adjust color
Make the color of the stone area around the water spot to be darker, thus to make whole stone slab almost the same color or similar, this kind of method could be 2 kind, one is protection color increase, the other is common color increase. When apply protection color increase method, the stone slab is also protected. While the common color increase method adjust the stone color only, do not have the function for protection.
Right now the treatment result for water spot is not so ideal, so the prevention treatment for water spot is especially important.

7,Two method of treatment for water spot, clean+restore method and color increase method. Clean+restore, ie, to return the stone to be original conditions. This is the best method, also the most difficult. So if this method could not reach to ideal effect, then could adopt the 2nd method, ie, color increase, thus to make the color difference not so obvious, improve the decoration effect.

Previous Article:about stone floor tile's quester   

Next Article :prevention and cure for stone water spot--(1)