1. Waterproofing with crystal
A cement-based method called crystalline waterproofing creates insoluble crystals inside the capillaries and pores of concrete. By obstructing water channels, these crystals render the concrete permanently impervious.
In contrast to surface coatings, crystalline waterproofing integrates into the concrete and has the ability to self-seal small fractures in the presence of moisture.
Reactive chemicals, silica sand, and cement are all present in the substance.
When used on concrete that has been exposed to moisture:
- Chemicals react with water and free lime to form
- Needle-like crystals that
- Fill holes, pores, and microcracks.
Water vapour can escape, but water cannot pass (breathable system)
2. Types of Crystalline Waterproofing
1. A crystalline layer
- Used for pre-existing constructions.
- Applied to a hardened concrete surface.
- Using a brush or a spray
2. Admixture with crystals
- Waterproofing the entire thickness of the concrete.
- Added straight to the concrete during batching.
- Utilised in the New Building
3. Ideal For
- Water-Retaining Buildings,
- basements and Foundations,
- Areas with Continuous Water Pressure,
- New Concrete Structures (using additive)
4. Useful Areas
- Positive and negative basements.
- Lift Pits
- Water Tanks
- Swimming Pools
- Foundations and Rafts
- Retaining Walls
- Sewage Treatment facilities
- Tunnels and Subterranean Buildings
5. Step-by-Step Implementation
1. Surface Readiness
- The concrete needs to be sound and clean
- Dust, paint, oil, and laitance must be removed.
- Water should be saturating the surface (SSD condition).
2. Preparing Slurry
- Combine the Crystalline Powder with Purified Water
- Brushable Slurry is Formed.
3. Utilisation
- Use a brush to apply the first coat in a cross direction.
- After two to six hours, apply the second coat.
- Make sure the entire area is covered.
4. Curing
- Don't let the surface dry out.
- Spray water occasionally.
- Keep the surface wet for three to five days.
6. Pros
- Permanent waterproofing (concrete lifespan)
- self-healing microcracks
- Resistance to Hydrostatic Pressure.
- ability to be applied on the negative side.
- lack of peeling, blistering, or delamination.
- chemical and salt resistance.
- breathable system
7 Cons
- Only works on concrete (not brick or plaster).
- Needs to be properly cured.
- Is not flexible enough to bridge big cracks
- Needs expert surface preparation
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