Cement-Based Capillary Waterproof Coating is a surface-applied, chemically active crystalline waterproofing system. Upon mixing with water, active catalytic chemicals penetrate the concrete matrix through capillary tracts and moisture. They react with calcium hydroxide and unhydrated cement particles to precipitate insoluble needle-like calcium silicate hydrate (CSH) crystals. These crystals permanently seal capillary pores and micro-cracks up to 0.4 mm against water ingress from both positive and negative hydrostatic pressure.
Technical Specifications
|
Test Parameter |
Test Standard |
Typical Value / Performance |
|
Appearance |
Visual |
Grey / White Powder |
|
Active Matter Content |
ISO 3251 |
>= 98% |
|
Capillary Penetration Depth |
EN 12390-8 / CRD C48 |
>= 100 mm (after 28 days) |
|
Hydrostatic Pressure Resistance |
DIN 1048 Part 5 |
Positive: >= 1.2 MPa |
|
Compressive Strength |
EN 196-1 |
1-Day >= 15.0 MPa |
|
Bond Strength to Concrete |
EN 1542 |
>= 1.5 MPa (concrete failure) |
|
Initial / Final Setting Time |
EN 196-3 |
Initial >= 45 min |
|
Mixing Ratio (Water : Powder) |
By Weight |
1 : 0.28 - 0.32 (Brush grade) |
|
Application Coverage |
Dry Film Thickness |
1.2 - 1.5 kg/m2 per coat (2 coats total) |
Key Features
Active Self-Healing: Catalytic chemicals remain dormant inside the concrete matrix. When micro-cracks form later and moisture re-enters, crystal growth reactivates to seal fractures up to 0.4 mm automatically.
Dual-Directional Sealing: Withstands up to 1.2 MPa of positive water pressure and 0.8 MPa of negative hydrostatic pressure without debonding or delaminating.
Vapor Permeability: Allows the concrete structure to "breathe" by permitting water vapor transmission, preventing internal vapor pressure buildup behind the coating.
Integral Bond: Becomes an intrinsic part of the concrete substrate rather than forming a superficial membrane; unaffected by surface wear or punctures.
Potable Water Safe: Certified non-toxic formulation compliant with drinking water contact standards, containing zero hazardous solvents or volatile organic compounds (VOC < 10 g/L).
Application Areas
Subterranean Structures: Basement retaining walls, elevator pits, foundation slabs, and underground parking decks.
Water Infrastructure: Potable water reservoirs, sewage treatment aeration tanks, clarifiers, and stormwater detention vaults.
Civil Engineering: Tunnel linings, subway stations, culverts, bridge abutments, and marine infrastructure exposed to tidal cycles.
Suitable Substrates
Compatible Substrates: Cast-in-place concrete, precast concrete elements, dense cementitious mortars, and shotcrete surfaces.
Surface Preparation Requirements: Substrates must achieve a surface tensile strength of >= 1.5 MPa. Concrete must be structurally sound, clean, free from oil, curing compounds, laitance, and form-release agents. Surface must be SSD (Saturated Surface Dry) prior to application.
Application Method
Surface Preparation: Mechanical scarification, grit-blasting, or high-pressure water jetting (> 250 bar) to open concrete pores and expose aggregate.
Pre-Watering: Saturate the concrete substrate with clean water until completely saturated. Standing water must be removed (SSD condition).
Batch Mixing: Add dry powder to clean mixing water at a ratio of 1 : 0.28 to 0.32 by weight. Mix using a low-speed mechanical stirrer (400 - 500 RPM) for 3 minutes until a lump-free, homogenous slurry forms.
Application: Apply two coats using a stiff-bristled masonry brush, specialized spray equipment, or roller. Apply the second coat while the first coat is still green (tack-free but damp, typically 4 - 8 hours apart).
Curing: Begin mist-curing with clean water 24 hours after application. Keep the coating damp for at least 3 consecutive days. Protect from direct sun, wind, and frost during the curing window.
Product Selection Guide
|
Grade ID |
Primary Application |
Recommended Dosage |
Key Technical Advantage |
|
CW-100 (Standard) |
General basements, retaining walls, tunnels |
1.5 kg/m2 (2 coats) |
Balanced setting time, high initial bond strength |
|
CW-200 (Rapid-Set) |
Emergency leak-stopping, active water seepage |
1.2 kg/m2 (2 coats) |
Initial set in 10 minutes, stops running water instantly |
|
CW-300 (Potable Water) |
Reservoirs, tanks, drinking water facilities |
1.5 kg/m2 (2 coats) |
NSF/ANSI 61 certified, zero leaching |
|
AD-50 (Admixture Type) |
Batch plant addition for precast/ready-mix |
0.8% - 1.2% by weight of cement |
Integral waterproofing throughout the concrete pour |
OEM & ODM / Customization
Private Labeling: Custom waterproof bag printing (multi-layer kraft paper bags with PE lining) featuring your brand logo, regulatory warnings, and localized contact details.
Formula Customization: Tailored setting times, adjusted viscosity for specific pump equipment, or specialized color pigmentation upon request.
Regulatory Compliance Support: Documentation packages prepared according to target market standards (CE marking dossiers, ASTM compliance test summaries, and REACH declarations).
Manufacturing & Quality Control
Production Capacity: Automated dry-mortar blending lines producing 120 metric tons per 8-hour shift.
Raw Material Control: High-purity Portland cement clinker (CEM I 52.5) and precision-graded quartz sand milled to controlled particle size distribution (< 0.15 mm).
In-House Laboratory Testing: Every production batch undergoes rigorous testing for sieve analysis, setting time, fluidity, and 28-day compressive strength before packaging. Batch retain samples are stored for 24 months for traceability.
Packaging & Storage
Packaging Options:
25 kg moisture-resistant multi-wall paper bags with internal polyethylene lining.
1,000 kg bulk jumbo bags (FIBC) for large-scale civil projects.
Palletization: Stretch-wrapped on ISPM 15 heat-treated wooden pallets (40 bags / 1,000 kg per pallet), secured with weather-protective hoods.
Storage Conditions: Store in dry, indoor conditions off the ground. Shelf life is 12 months in unopened, original packaging.
FAQ
Q: Can this coating be applied to the negative (positive-pressure side opposite) side of a foundation wall?
A: Yes. CW-100 is engineered to resist negative hydrostatic pressure up to 0.8 MPa. The active chemicals penetrate inward through the concrete matrix, sealing internal capillaries regardless of water entry direction.
Q: What is the minimum concrete curing age required before application?
A: Cast-in-place concrete must cure for a minimum of 28 days to allow proper hydration and dimensional stability. For repairs, ensure the substrate has cured sufficiently to reach a minimum compressive strength of 20 MPa.
Q: Can cement-based capillary coatings be overcoated with epoxy paints or cementitious renders?
A: Yes, but all loose crystalline residue must be removed by high-pressure washing or light acid etching once the waterproofing layer has fully cured and dried (minimum 14 days). Pull-off adhesion tests are recommended prior to applying secondary finishes.
Q: What is the lead time for bulk container shipments?
A: Standard production and port delivery for full container loads (20' FCL) require 12 to 15 business days from order confirmation. Custom OEM packaging requires an additional 5 business days for printing cylinder setup.
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