When it comes to salt, what everyone is familiar with cannot be familiar. Salt is an indispensable part of our lives. Three meals a day are indispensable, but salt will also damage the stone to a certain extent. Yu Shui. So, what damage does salt do to stone? Next, let's take a look at Xiaobian FABULOUS.
The destructive power of salt on stone is concentrated in the following: stress caused by crystallization weathering, crystallization pressure, hydration pressure, moisture absorption and expansion, and temperature expansion.
Because of the role of salt, the stone becomes loose and forms the main weathering cause of the stone. The existence of salt: one is the crystalline salt attached to the stone itself, and the other is the salt formed by the combination of the acquired stone components and the acid gas in the air.
In the construction of stone, the salt in cement, lime, soil, food, sea water, industrial production, etc., some cleaning agents will enter the stone through the micropores and cracks of the stone through capillary phenomenon. After the salt forms crystals in the stone, a lot of pressure is generated, which is the crystallization pressure. The greater the crystallization pressure, the greater the destructive power of the stone. Some salts are also transformed into recrystallized hydrates under certain conditions, which in turn occupy a larger volume and generate additional pressure, that is, hydration pressure.
The molecular formula of gypsum has large water molecules. As the temperature changes, the pressure changes correspondingly, and the repeated stress changes. Finally, the local stone changes into powdery, crushed nitrate, and scaly.
The damage of salt to the stone is often caused by repeated dissolution-precipitation-precipitation on the surface of the stone with the help of moisture and wind, and finally the stone is broken.