Epoxidized linseed oil is emerging as a versatile, bio‑based modifier for asphalt binders and asphalt mixtures, offering a useful combination of performance enhancement and sustainability. Produced from renewable linseed oil through a controlled epoxidation process, epoxidized linseed oil can be used to partially replace or complement traditional petroleum‑based modifiers in road construction and waterproofing applications.
In asphalt binders, epoxidized linseed oil acts as a reactive plasticizer and compatibilizer. Its epoxide groups can interact with polar components in asphalt, helping to improve dispersion and binder homogeneity. This often results in better workability during mixing and compaction, reduced viscosity at processing temperatures, and more uniform coating of aggregates. At the same time, epoxidized linseed oil contributes to improved low‑temperature flexibility, helping to reduce the risk of thermal cracking in cold climates.
The presence of epoxidized functional groups can also enhance the aging resistance of asphalt. By improving oxidative stability and moderating hardening during service, epoxidized linseed oil helps maintain a better balance between stiffness and elasticity over time. This can translate into enhanced resistance to fatigue cracking and surface distress under repeated traffic loading. In certain formulations, epoxidized linseed oil may also assist in reducing moisture susceptibility, improving the adhesion between asphalt binder and mineral aggregates.
From an environmental perspective, epoxidized linseed oil provides a renewable, low‑odor alternative to some conventional additives. Its use supports lower reliance on fossil resources and aligns with the trend toward greener pavement technologies. By integrating epoxidized linseed oil into asphalt systems, pavement designers can pursue improved performance, extended service life, and a smaller environmental footprint in modern road and waterproofing projects.