Crystalline Waterproofing Additive (Calcium Silicate Hydrate)
CAS Number: 1344-95-2
Crystalline waterproofing additive works by generating calcium silicate hydrate (CSH) crystals that fill and block concrete capillary pores and micro-cracks, providing long-term integral waterproofing. Unlike surface-applied membranes, it becomes a permanent part of the concrete matrix and self-seals new cracks up to 0.4 mm wide throughout the structure's life. Dosage is typically 2–4% by cement weight.
Technical Specifications
| pH | 11.0-13.0 |
| appearance | Grey fine powder |
| chloride content (%) | ≤0.05 |
| fineness (% passing 80 μm) | ≥90 |
| water permeability ratio (%) | ≤40 |
Applications
- Underground structures: basements, tunnels, foundations
- Water-retaining structures: tanks, pools, reservoirs
- Tunnels and subway structures
- Marine and waterfront concrete structures
- Concrete requiring self-healing crack capability
Key Features
- Integral waterproofing that becomes part of the concrete matrix
- Self-sealing capability for cracks up to 0.4 mm
- Permanent protection that improves over time
- Potable water safe, certified for drinking water contact
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