Alkali Efflorescence Treatment: Symptomatic and Radical Approaches for Stone Protection and Restoration
Lizzy
Alkali Efflorescence Treatment: Symptomatic and Radical Approaches for Stone Protection and Restoration
Overview of Efflorescence Issue
The protection against stone efflorescence and rust spots primarily relies on waterproofing. Stones have about 0.8% water absorption rate and many capillaries. Water carrying alkaline substances from cement, mortar, or within the stone itself rises to the surface and forms spots upon evaporation.
Radical Approach
1. Dehumidification and Cleaning
Start with 150# dry grinding to open pathways, akin to "prepping the skin" before surgery.
Clean off existing alkaline substances.
2. Apply Rust Remover
Use products like "Ya Lun R96 Stone Rust Remover," applying it sparingly but frequently.
3. Apply Protective Agent
Apply stone protective agent and cure for 72 hours.
4. Grinding and Stain Resistance Treatment
After grinding flat, conduct stain resistance treatment using fluorine-containing protective agents.
5. Sealing Capillaries
Use marble crystal hardener for crystallization and polishing to form a crystal film.
6. Regular Maintenance
Regularly maintain the crystal film to preserve its effect.
Although the radical method is quick and effective, it is cumbersome and has a higher upfront cost.
Symptomatic Approach
The symptomatic approach mainly involves repeatedly performing crystallization polishing and applying protective treatments (applying oily stone penetrating protective agents and grinding) during dry weather. The entire process is lengthy, taking about 2 years.
Outdated Practices
In the past, stone waxing and polishing were popular, but this actually accelerates the yellowing and degradation of stone. Wax clogs the stone's capillaries, preventing water evaporation and increasing the exudation of alkaline substances. Instead, use a dedicated protective agent that forms a protective film inside the capillaries.