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In the use of cement-mounted marble floors, especially through crystal care, refurbished ground, there is often a phenomenon of white back. Light, such as a layer of mist, can be wiped with a neutral detergent; heavy to form a layer of hoarfrost, can be removed with crystallizer steel wool, and will soon appear again; more serious will appear stone The surface is spotted, or the slag is smashed along the pattern line, or a speckle-like pulverization phenomenon occurs.
The white Huahua formed in the stone is similar to the water spot trace. Due to the large amount of water plus alkaline metal ions, these are the direct causes of Baihua, and the water will be alkaline. After the metal ions are dissolved, they are directly infiltrated into the stone due to the unfilled place or the crack on the surface of the stone, thereby further forming the stone white. Therefore, moisture and alkali should be prevented as much as possible during installation and construction. The metal ionic species penetrate into the stone. Here are a few precautions:
1. Before the installation of the stone, due to the construction requirements, it is necessary to carry out the frontal or even the protective work of five or six sides, in order to prevent the stone from being infiltrated into the structure of the stone itself due to the groundwater or the water in the cement. The infiltration of alkaline metal ions in the cement causes Baihua.
2. When selecting the caulking agent for stone, the caulking material suitable for the stone should be selected, and the construction should be carried out in the correct way during operation to prevent the occurrence of Baihua in the caulking.
3. For cement mortar used in stone laying, it is necessary to use some cement mortar with low water and ash ratio, and need to add water reducing agent to reduce excess water in cement.
4, the use of some non-polluting aggregates, should be used to avoid the use of sea sand, because the metal ions such as calcium, magnesium and sodium in the sea sand are more crazy, in order to reduce the source of metal ions in the aggregate, and required in the cement A water repellent is added to the mortar to prevent the metal ion component from being dissolved by a large amount of water and penetrating into the stone.
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