The main reason for the formation of wet marks is the influence of the cement mortar in the construction method. Since the trace elements contained in the cement composition have a strong adsorption effect on moisture, in a humid atmosphere, when the ambient temperature is higher than 35 degrees, a corrosive solution is formed immediately. Crystal water often changes due to temperature changes, but does not disappear, forming a phenomenon of wet marks and not dry.
Improper selection of protective agent use methods or varieties. There are many varieties of protective agents on the market, and different protective agents should be selected for different stone materials, different parts of use, and different paving methods, which is often overlooked. What is more important is the reasonable selection of construction methods and usage. It is often found that the facade or ground in the same building area, under the construction conditions of using the same stone (the same large slab), the same cement and sand, even under the construction conditions of the same building area. It is the appearance of different water spots (stains) on the same stone, that is, some stones are dry and some are wet.
This situation is basically the result of the use of stone protective agent without careful operation according to the requirements of use. There are great differences in the amount of protective agent used and the uniformity of brushing. The proportion is sufficient according to the requirements of use, and the stone is painted evenly, and it dries quickly. On the contrary, it is easy to appear water spots (stains) not dry phenomenon.
The prevention method is mainly to protect the stone and make the stone waterproof, so as to block the moisture in the air from contacting the material inside the stone or cement and reduce its chemical reaction conditions; secondly, try to avoid the use of cement to install the stone; finally, it is necessary to do a good job of caulking and drainage works.
There is no effective way to deal with the wet marks that have appeared at home and abroad. The main remedy is to adjust the color difference between the two by deepening the color of the part without wet marks by resin injection.
