Roads are the backbone of modern infrastructure. Evonik supplies TEGO® Addibit, TEGO® Antifoam and VESTENAMER® additives that act at the interface between bitumen and aggregate — improving adhesion, controlling foam and emulsion behaviour, and enabling application at ambient and reduced processing temperatures across hot mix asphalt, foamed bitumen, bitumen emulsions and rubber-modified asphalt.
Why Choose Evonik for Asphalt Applications?
- Interface Expertise: Decades of experience in surfactant chemistry applied to bitumen and aggregate interfaces.
- Documented Parameters: Active contents, heat stability limits and dosage ranges are specified for every grade.
- Tailored Solutions: a Cationic and amphoteric emulsifiers covering CRS, CMS and CSS setting classes to help meet your performance needs.
Solutions by Application
Bitumen Emulsions — Ambient-Temperature Application
TEGO® Addibit emulsifiers turn bitumen into stable emulsions that can be mixed and applied at ambient temperature, with controlled breaking and curing across cationic rapid-setting (CRS), medium-setting (CMS) and slow-setting (CSS) systems.
- TEGO® Addibit DF– liquid emulsifier, 30 % active content, for anionic, cationic and non-ionic bitumen emulsions; delivers emulsion stability across pH 2 to.
- TEGO® Addibit EK 50 – liquid emulsifier, 38 % active content, for anionic, cationic and non-ionic emulsions.
- TEGO® Addibit F4 HB SZ 10 – flaky emulsifier, 100 % active content, for cationic bitumen emulsions.
- TEGO® Addibit F4 HB and L 300 N – adhesion agents that also act as emulsifiers in cationic systems, 100 % active content.
- TEGO® Antifoam 1488 – defoamer based on organo-modified siloxanes, 18–22 % active content; suppresses foam without the spotting and fisheye defects of silicone-oil antifoams.
Amphoteric emulsifiers carry both positively and negatively charged groups and switch ionic character with pH, which is what makes the pH 2 to 14 range possible. TEGO® Addibit DF and EK 50 are not available in the United States, Mexico and Canada.
Foamed Bitumen — Low-Temperature Asphalt
- TEGO® Addibit FS 726 – foam stabilizer, 30 % active content, foam stability greater than 3 hours. Effective at 0.05–0.15 % w/w binder and compatible with all common bitumen grades, including mixes with high reclaimed asphalt content.
Foam stabilizers reduce binder droplet size, increasing the surface area available to wet aggregate and filler. Where low-temperature asphalt replaces a hot-mix process, production and compaction run 30–40 °C lower, with a corresponding reduction in fuel consumption at the mixing plant. The achievable reduction depends on the plant, the mix design and the binder grade.
Hot Mix Asphalt — Adhesion and Thermal Stability
Antistripping agents modify the aggregate surface to strengthen the bitumen–aggregate bond. That bond determines how well the mix resists moisture damage, particularly on hydrophilic aggregates such as granite and quartzite.
- TEGO® Addibit F4 HB – flaky adhesion agent, 100 % active content, heat stable up to 280 °C; significantly reduces wheel tracking.
- TEGO® Addibit L 300 N – liquid adhesion agent based on fatty acid polyamines, 100 % active content, solvent-free and pumpable at room temperature. Improves adhesion on acidic, neutral and alkaline aggregates; heat stable in hot bitumen up to approximately 180 °C.
Rubber-Modified Asphalt — Ground Tire Rubber Compatibilizaion
Ground tire rubber used as sole modifier behaves as a non-reactive additive in bitumen and gives a sticky mix that is difficult to process. A polyoctenamer enables interaction between the crumb rubber and the binder, producing a uniform, barely sticky rubber-containing compound.
- VESTENAMER® 8012 – polyoctenamer compatibilizer in pellet form, 100 % active content, for rubber-modified bitumen. Improves mixing and workability of GTR-modified mixes.
Your Evonik Advantage
- Adhesion and Service Life: Improved bitumen–aggregate adhesion reduces moisture-induced stripping, the mechanism behind early ravelling and pothole formation in wet climates. [TEGO® Addi...ations_WEB | PDF]
- Process Flexibility: Additives covering hot mix at up to 280 °C, foamed bitumen at 100–130 °C and emulsions at ambient temperature.
- Formulation Support: Our specialists work with on dosage, emulsion recipes and setting-class selection.
Ready to Build Smarter Roads? Our specialists can advise on dosage, emulsion recipes and setting-class selection.
Contact us today or explore our solutions.