Mechanism of Action of Cement-Based Permeable Crystalline Waterproof Coating
     Cement-based permeable crystalline waterproof coatings represent a new generation of rigid waterproofing solutions composed primarily of Portland cement, quartz sand, and active chemical compounds. Unlike traditional coatings that rely solely on surface layers, these materials penetrate into the concrete substrate, forming crystals that seal capillary pores and micro-cracks. This unique mechanism provides both durability and flexibility, enabling it to cover hairline cracks effectively.
1. Mechanism of Action of Cement-Based Permeable Crystalline Waterproof Coating
The action of cement-based permeable crystalline coatings typically involves three key stages: dissolution, penetration, and crystallization. These steps ensure the coating reacts chemically with the concrete, enhancing its waterproof properties over time.
1.1 Dissolution Process
In a dry state, the active components are hydrophilic and do not react. However, when exposed to water, they dissolve and form small molecules. Under suitable conditions, these molecules polymerize and grow into water-insoluble crystals that block the pores and cracks in the concrete.
1.2 Penetration Process
Once applied, the active ingredients move through the water present in the concrete pores. The concentration gradient drives the movement of these ions into the interior of the structure, allowing them to react with free lime and other compounds within the concrete.
1.3 Crystallization Process
This process includes precipitation reactions and complexation-precipitation reactions. In the former, the active substances react with calcium hydroxide to form insoluble crystals, sealing the pores. In the latter, they form unstable complexes that later transform into stable crystalline structures.
2. Application of Osmotic Crystalline Waterproof Coating
With increasing demands for concrete durability, permeability has become a critical factor. Osmotic crystalline coatings help reduce permeability by forming internal protective layers that enhance structural integrity and longevity.
2.1 Mechanism of Action
The coating infiltrates the concrete, reacting with its components to create crystals that close pores and cracks. This creates a protective layer that significantly improves the concrete’s resistance to water ingress.
2.2 Waterproof Principle
By using water as a carrier, the active ingredients penetrate into the concrete's pores. There, they interact with ions to form crystals that expand and fill the spaces, creating an impermeable barrier.
2.3 Characteristics of Osmotic Crystalline Waterproof Coating
(1) Resists high hydrostatic pressure. (2) Requires wet construction areas. (3) Provides waterproofing from both sides. (4) Has good wear resistance. (5) Flexible enough to cover small cracks. (6) Compatible with tiles and paints. (7) Non-toxic and safe for use in drinking water tanks. (8) Maintains gas permeability. (9) Available in multiple colors for visibility and aesthetics.
3. Construction of Osmotic Crystalline Waterproof Coating
3.1 Basic Requirements and Treatment
The surface must be clean, flat, and free of debris. Any defects should be filled before application. The area should be moistened but not flooded.
3.2 Construction Methods
Apply the coating with a brush or sprayer. Ensure even coverage, avoid thick layers, and allow proper curing time. Do not apply in hot or rainy weather.
Conclusion:
Osmotic crystalline waterproof coatings offer long-term protection by sealing pores and improving the structural integrity of concrete. They are ideal for projects requiring both durability and flexibility. With proper application, these coatings can significantly extend the lifespan of concrete structures while maintaining their performance under various environmental conditions.
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