Overview
Colored asphalt thin layer is a specialized paving material that combines traditional asphalt's durability with decorative pigments. It is typically applied as a 1–3 cm overlay on existing pavement surfaces. The product is widely used in urban planning to enhance visual appeal while maintaining functional performance. Unlike standard asphalt, colored variants incorporate iron oxide or synthetic pigments for long-lasting hues. This material is particularly popular in Europe and Asia for traffic calming zones and green infrastructure projects. Its composition balances polymer-modified binders, aggregates, and colorants.
Physical and Chemical Properties
The material exhibits excellent weather resistance, with UV-stabilized pigments preventing fading for 5–8 years under normal conditions. Its softening point typically ranges between 60–80°C, ensuring stability in most climates. The surface texture can be adjusted from smooth to coarse (Skid Resistance Value ≥45 BPN) for safety requirements. Chemically, colored asphalt is inert after curing, with negligible leaching of components. The binder system often includes styrene-butadiene-styrene (SBS) modifiers for enhanced flexibility. Acrylic-based colorants are preferred for their pH stability and adhesion properties.
Main Applications
Primary applications include urban bike lanes (red being most common), pedestrian crossings, and bus lane demarcation. Municipalities use blue/green variants for water-permeable parking lots in sponge city projects. Theme parks and commercial plazas employ custom colors for wayfinding and branding. The material also serves functional purposes—red zones alert drivers to high-risk areas, while green surfaces often denote eco-friendly spaces. Some formulations incorporate retroreflective glass beads for nighttime visibility. Special anti-slip versions are mandated for ramps and bridges in many jurisdictions.
Safety and Storage
Pre-mixed colored asphalt should be stored at 150–180°C in insulated containers for ≤48 hours before application. Bulk pigments require dry storage at 5–30°C to prevent clumping. Cold-applied variants (water-based emulsions) have shelf lives of 6–12 months in sealed containers. Installation teams should use NIOSH-approved respirators when heating the material due to potential fume emission. The cured surface is non-toxic and safe for pedestrian traffic after 24-hour curing (48 hours for heavy vehicles). Regular cleaning with pH-neutral detergents maintains color intensity.
B2B Procurement Guide
When sourcing colored asphalt, verify the pigment concentration (minimum 5–7% by weight for lasting color). Request ASTM D7370 test reports for colorfastness and DIN EN 12697-33 for skid resistance. For large projects, insist on batch consistency certifications. Consider regional climate—epoxy-modified binders perform better in freeze-thaw cycles. Procurement should account for 10–15% overage for cutting/pattern work. Leading manufacturers include BASF Colas, Tarmac, and Chinese producers like BituChem. Containerized shipments are preferable for international orders to prevent moisture contamination.
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