Which factors affect app vs sbs modified bitumen in asphalt or bitumen modification systems?

Several factors influence the performance of APP (Atactic Polypropylene) and SBS (Styrene-Butadiene-Styrene) modified bitumen in asphalt systems. Key factors include the polymer’s compatibility with bitumen, the modification process, temperature susceptibility, and aging resistance. APP typically offers better heat resistance and UV stability, while SBS provides enhanced elasticity and flexibility. The choice between them also depends on the specific application requirements, environmental conditions, and desired performance characteristics of the asphalt mixture.