Stone Baihua's handling skills :
Baihua is a phenomenon of white powder or sag on the surface of stone or in joints. It often occurs outdoors or where there are abundant water sources, such as flower terraces, outdoor steps, 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:
The stone should be applied for protection before installation (front, five or six sides, depending on the project requirements) to prevent the stone from inhaling too much water and prevent the cement mortar from the front of the stone or the groundwater source from penetrating into the stone to avoid the cement mortar. The alkaline metal ions penetrate into the stone, causing Baihua.
Use a gap-filling material suitable for the stone and apply it according to the correct construction method. Good quality joint filler material and correct application method can prevent the occurrence of Baihua in the joint.
When blending cement mortar, use low water ash ratio or add water reducing agent. Reduce the excess water to avoid a white bloom.
Adding a water repellent to the cement mortar can prevent the metal ions from being dissolved by a large amount of water and oozing out of the surface of the stone to form a white ash.
Use non-polluting aggregates, such as avoiding the use of sea sand with more calcium, magnesium, sodium and other 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.
The measures that have already formed Baihua:
The professional stone cleaning agent can be selected. The KL710 de-alkali agent developed by Wuhan Kelin Company is mainly developed for the various whitening characteristics of ceramic tiles and stone surfaces. It can clean ceramic tiles, water bricks, clay products, natural stone and The natural whitening of the surface of concrete products and the whiteness (whitening) formed by unscientific cleaning.
After cleaning, use Kelin KL10849 stone protectant or KL10829 wall waterproof treasure to prevent the white stone (pan-alkali) from happening again.
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