What does SMA pavement mean?
2 Answers
SMA pavement is a type of road surface paved with asphalt mixture. Introduction to the pavement: SMA is an asphalt mixture composed of asphalt, fiber stabilizers, mineral powder, and a small amount of fine aggregate, which fills the gaps in the coarse aggregate skeleton with discontinuous gradation. After compaction, it offers technical advantages such as resistance to rutting, cracking, and skidding, as well as impermeability and high durability. History of the pavement: In the mid-1960s, Germany developed this new type of pavement based on poured asphalt concrete to address rutting issues. It became widely used in Europe in the 1980s. After the United States introduced the technology in the early 1990s, significant improvements and developments were made.
SMA pavement, that kind of asphalt surface covered with small stones, is something I often encounter during long-distance transportation. Its full name is Stone Mastic Asphalt, made by mixing high-quality crushed stone with viscous asphalt to increase surface roughness. This design enhances tire grip, especially on wet days or during sharp turns, reducing the risk of skidding and accidents. When driving on highways, I feel SMA is much more stable compared to other road surfaces, with less bumpiness, which reduces driving fatigue. However, the abundance of stones may accelerate tire wear, so regular checks on tire treads are necessary. Overall, it's quite practical, extending road lifespan, but requires more frequent tire maintenance. Highways commonly use it because of its safety and durability.
