We often see some white crystals flowing out of the seams of the stone. This is Baihua. Here, let's get to know about Baihua. Stone Baihua is a phenomenon of white powder or sag on the surface of stone or joints. It often occurs outdoors or where there are abundant water sources, such as flower terraces, outdoor ladders, and external wall caulking. When the stone is installed in a wet manner, the alkaline substance such as calcium hydroxide in the cement mortar is back-dissolved and dissolved by a large amount of water to penetrate the surface of the stone or the place where the joint is not filled, and the calcium hydroxide and the carbon dioxide in the air Or the SO2 sulfuric acid compound in acid rain reacts to form calcium carbonate or calcium sulfate. When the water evaporates, calcium carbonate or calcium sulfate crystallizes to form white Hua. The factors that form Baihua in stone are similar to those in water spots. A large amount of water and alkaline metal ions are the causes of Baihua. Among them, water plays the role of destroyer. After dissolving alkaline metal ions, it penetrates into the surface of stone by capillary phenomenon. If the caulking is not true, Baihua will be further formed. Therefore, prevention of the penetration of water and alkaline metal ions to the surface of the stone or the unfilling of the joint can prevent the occurrence of Baihua. The measures to prevent the formation of Baihua are as follows: First, the stone should be applied for protection before installation (front, five or six sides, depending on engineering requirements), to prevent the stone from inhaling too much water, to prevent cement from the front of the stone or the groundwater source to penetrate the cement mortar under the stone to avoid The alkaline metal ions of the cement mortar penetrate into the stone, causing Baihua. Second, select the gap material suitable for the stone, and apply according to the correct construction method. Good quality joint filler material and correct application method can prevent the occurrence of Baihua in the joint. 3. When blending cement mortar, use low water ash ratio or add water reducing agent. Reduce the excess water to avoid a white bloom. 4. Adding a waterproofing agent to the cement mortar can prevent the metal ions from being dissolved and oozing out of the surface of the stone to form white hua. 5. Use non-polluting aggregates, such as avoiding the use of sea sand with more calcium, magnesium and sodium ions, and avoid using groundwater with more minerals as mixing water, reducing the source of metal ions and reducing the chance of occurrence of Baihua. . Concerned about surprises Label: How to deal with the problem of stone white? Previous: How to distinguish the oil mixing and oil cleaning process of the wooden door Next: Introduction to the load cell
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