NWT319 PB Polymer-Modified Asphalt Waterproof Coating for Roads and Bridges

This product is an environmentally friendly waterproof coating meticulously formulated using cationic emulsified asphalt as the base material and a blend of high-quality polymers as composite modifiers.

Product Categories

They are classified into Type I and Type II based on performance.

Code Marker

PB—Polymer-modified bituminous waterproof coating for roads and bridges; L—Water-based, cold-applied

Products are labeled in the order of name, usage, category, and standard number.

Example: Type I water-based polymer-modified bituminous waterproof coating for roads and bridges is labeled as:

Waterproof Coatings for Roads and Bridges PB L I JC/T 975-2005

Product Features

• High elasticity: The coating film has an elongation of 800% or higher, providing exceptional resistance to structural deformation;
• Strong Adhesion: Upon contact with alkaline substances in cement, the product immediately breaks down the emulsion and cures, penetrating the concrete to form a strong bond with the substrate; the bond strength between the coating film and the substrate exceeds the coating’s own strength;
• Good heat resistance: The coating remains intact even at high temperatures of 160°C and can withstand the compaction of hot asphalt concrete during paving;
• High Cold Resistance: The waterproofing layer can withstand structural deformation caused by heavy loads and shear forces from horizontal loads even at temperatures below -40°C;
• Environmental Friendliness: Water-based coatings are non-toxic, odorless, and do not pollute the environment, making them safe to apply;
• Workability: Cold application by spraying; the process is convenient.

Construction Methods

Apply using brush or spray application methods.

• Process Flow

Cleaning the Base

Spray Coating: Cleaning, Inspection, and Acceptance

Application of the Protective Coating

• Key Construction Points

Basic Requirements:

◎ The surface shall be solid and level. When leveling with cement mortar, it must be properly cured; there shall be no signs of crumbling, sanding, or peeling, and it shall comply with the design requirements.

◎ Concrete surfaces must be roughened, planed, or shot-blasted.

◎ The moisture content of the bridge deck shall not exceed 15%.

Coating Application: The coating may be applied by brushing, rolling, or spraying. It should be applied in layers, preferably in 3–4 coats. Each subsequent coat should be applied after the previous coat has cured and formed a film, and the application direction should be perpendicular to that of the previous coat.

• Important Notes:

◎ Stir the paint thoroughly before use.

◎ The recommended application temperature is 5–35°C.

◎ The waterproofing layer must be completely dry before asphalt can be laid.

◎ Do not walk on the coating or allow vehicles to drive over it until it has dried and the asphalt concrete has been laid.

◎ Waterproofing for bridge deck expansion joints, guardrail expansion joints, bridge deck drainage outlets, and other similar areas requires enhanced treatment.

• Recommended coverage: For a 1.0 mm-thick coating film, the total paint consumption is approximately 2.1–2.5 kg/m².

Applications

Suitable for anti-corrosion, anti-seepage, and waterproofing projects on bridges and highways.

Packaging, Storage, and Transportation

• Packaging: Sealed in steel drums.
• Storage: Store in a cool, well-ventilated warehouse. Do not store outdoors under any circumstances, and do not place any items on top of the product. The storage temperature should be between 5 and 40°C. The shelf life is 6 months from the date of manufacture.
• Transportation: Store upright; do not store upside down; protect from sunlight and rain; keep away from sources of fire; avoid impact and keep the packaging intact; handle with care during loading and unloading; do not throw.

Performance Metrics

Applicable Standard: JC/T 975-2005 “Waterproof Coatings for Roads and Bridges”

General Properties of Coatings

Coating Application Performance