Overview
Nonionic emulsified asphalt is a colloidal dispersion of asphalt droplets in water, stabilized by nonionic surfactants. Unlike cationic or anionic emulsions, it offers pH-neutral stability, making it compatible with a wider range of aggregates and additives. This emulsion is favored for its environmental benefits, as it eliminates the need for high-temperature application and reduces volatile organic compound (VOC) emissions. It is commonly produced by high-shear mixing of asphalt (60-70% by weight) with water and surfactants.
Physical and Chemical Properties
The emulsion appears as a homogeneous brown or black liquid with a viscosity ranging from 20 to 500 cP, depending on the grade. Its stability is attributed to nonionic surfactants like ethoxylated alcohols, which form a protective layer around asphalt droplets. Key metrics include sieve residue (<0.1%), storage stability (separation <1% after 24 hours), and breaking time (adjustable from minutes to days). It exhibits pseudoplastic flow behavior and adheres well to damp surfaces due to its water tolerance.
Main Applications
In road construction, it serves as a binder for cold mixes, tack coats, and chip seals. Its slow-breaking properties make it ideal for mixing with dense-graded aggregates or recycled materials. For waterproofing, it is applied as a primer or membrane on roofs, foundations, and tunnels. Other uses include dust suppression on unpaved roads and corrosion protection for pipelines. The nonionic formulation is particularly effective with siliceous aggregates and in high-humidity conditions.
Safety and Storage
While less hazardous than hot asphalt, the emulsion can cause skin irritation. Workers should wear gloves, goggles, and protective clothing. Spills should be contained with absorbent materials to prevent slipping hazards. Storage tanks must be corrosion-resistant (e.g., polyethylene or stainless steel) and equipped with gentle agitation to prevent settling. Shelf life is typically 3-6 months when stored between 5-40°C. Freezing irreversibly breaks the emulsion.
B2B Procurement Guide
Specify parameters such as asphalt content (60-70% typical), viscosity (measured at 25°C), and breaking time (rapid, medium, or slow). Request test reports for EN 13808 or ASTM D2397 compliance. Bulk shipments require temperature-controlled tankers. For smaller orders, 200L drums or IBC totes are common. Compare surfactant systems—polyoxyethylene alkyl ethers offer better freeze-thaw stability than sugar-based surfactants. Negotiate pricing based on annual volume commitments.
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