the wet lesions of Natural slate disease quit

The main reason for the formation is due to the influence of the cement mortar in the wet construction method. Because the cement composition contains 1% to 2% of sodium hydroxide, because of its strong adsorption of water, in the humid atmosphere when the ambient temperature is higher than 35 degrees, immediately form a corrosive sodium carbonate solution. Crystalline water often changes due to changes in temperature, but will never be scarce, which formed a wet mark is not dry phenomenon.

The prevention method is mainly to protect the Natural slate, so that the Natural slate material with water resistance, so as to block the moisture in the air and Natural slate or cement internal material contact, reduce its chemical reaction conditions; Secondly, should try to avoid the use of cement construction and installation materials ; Finally, we should do a good job in sealing works and drainage works. Processing has been the emergence of wet marks, there is no effective way at home and abroad. The main use of the remedial measures is to use resin injection method so that there is no wet mark parts of the color deepened, in order to adjust the color difference between the two.

This phenomenon is mainly due to strong alkaline cement and the atmosphere of the acidic solution from the reaction. Sodium carbonate solution through the pores of the Natural slate to the Natural slate surface, and immediately with the moisture containing carbonic acid to neutralize the reaction, the formation of salt solution, the solution of water dry, the formation of salt crystallization. In case of water dissolution on a large area. Prevention should first avoid the use of wet construction methods, followed by the use of protective agents to make Natural slate with waterproof performance. And do a good job sealing work. The method of treating salt crystallinity is simple. First brush the Natural slate surface of the white powder brush off, and then a lot of water thoroughly clean the residue, and finally to protect or in the Natural slate surface with a waterproof performance of the polishing agent can be polished.