![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Understanding Stone Baihua and Its Prevention
Baihua, commonly known as white efflorescence, is a white powdery or crystalline deposit that appears on the surface of stone or in the joints. It typically occurs in areas with high moisture levels, such as outdoor terraces, steps, and exterior walls. This phenomenon is often linked to construction practices involving wet installation methods.
When stones are installed using cement mortar, alkaline substances like calcium hydroxide can be dissolved by water and seep into the stone’s surface or unfilled joints. Once exposed to air, these compounds react with carbon dioxide or sulfur dioxide from acid rain, forming calcium carbonate or calcium sulfate. As the water evaporates, these salts crystallize, resulting in the visible white bloom known as Baihua.
The formation of Baihua is similar to that of water spots. A combination of excessive moisture and alkaline metal ions contributes to this issue. Water acts as the main carrier, dissolving these ions and allowing them to penetrate the stone through capillary action. If joints are not properly filled, the problem worsens. Therefore, preventing water and alkaline ions from reaching the stone surface is key to avoiding Baihua.
Preventive Measures Against Baihua:
Before installation, apply a protective coating to the stone—typically the front and several sides depending on the project needs. This helps reduce water absorption and prevents cement mortar or groundwater from penetrating the stone, which could lead to Baihua caused by alkaline ions.
Use appropriate joint filler materials and follow proper application techniques. High-quality fillers and correct installation can significantly reduce the chances of Baihua forming in the joints.
When mixing cement mortar, use a low water-to-cement ratio or add a water-reducing agent. This minimizes excess water, which is a major contributor to white bloom.
Incorporate a water-repellent additive into the mortar. This helps prevent the dissolution and migration of metal ions, reducing the risk of white deposits on the stone surface.
Choose non-polluting aggregates, such as avoiding sea sand rich in calcium, magnesium, and sodium. Also, avoid using mineral-rich groundwater for mixing. These steps help minimize the presence of metal ions, lowering the likelihood of Baihua occurrence.
Remedies for Existing Baihua:
For already formed Baihua, consider using a professional stone cleaning agent. The KL710 De-alkali Agent developed by Wuhan Kelin Company is specifically designed to remove various types of whitening on ceramic tiles, natural stone, and concrete surfaces. It effectively cleans white stains caused by improper cleaning methods or chemical reactions.
After cleaning, apply a protective treatment like Kelin KL10849 Stone Protector or KL10829 Wall Waterproof Treasure. These products create a barrier that prevents future occurrences of Baihua or alkali-related staining.
Carbide Endmills for Dynamic Milling,Carbide CNC Milling Cutter,DLC Coating Solid Milling Cutter,Long Length Endmills for Stainless Steel
Suzhou Meiwei Cutting Tools LTD , https://www.meiweitools.com