The difference between sbs and rubber-modified asphalt

I. Core Material Differences

The key to SBS modified asphalt lies in styrene-butadiene block copolymer, a thermoplastic elastomer that imparts elasticity to asphalt like a rubber band. Rubber modified asphalt primarily uses recycled tire rubber powder, forming a network structure through vulcanization. Their modification mechanisms differ: the former involves physical blending, while the latter involves chemical cross-linking.

II. Performance Comparison

Temperature Adaptability: SBS modified asphalt retains flexibility at -30°C, while rubber modified asphalt becomes brittle at low temperatures.

Durability: Rubber modified asphalt demonstrates superior aging resistance, extending service life by approximately 20%.

Construction Convenience: SBS modified asphalt offers superior storage stability and is less prone to segregation.

III. Typical Application

Scenarios Highway Surface Layers: SBS modified asphalt is preferred (strong rutting resistance). Airport Runways: Rubber modified asphalt is more suitable (fuel corrosion resistance). Urban Roads: Either type is viable, depending on budget and climate conditions.