What is "geofoam" and its purpose in highway construction?

Geofoam is a lightweight synthetic material, often made from expanded polystyrene (EPS), that is utilized in highway construction primarily to mitigate settlement and provide stability in embankment and subgrade applications. Its low density helps reduce the overall load on the underlying soil, minimizing the risk of settlement or failure due to excessive weight. This is particularly useful in scenarios where traditional materials might contribute to destabilization or where the soil is weak and cannot adequately support heavy loads.

The purpose of using geofoam extends beyond just reducing weight. It also includes enhancing the performance of the road structure by providing a more uniform distribution of loads, improving drainage characteristics, and allowing for rapid construction techniques without compromising the integrity of the highway. Its capabilities make it a valuable material for engineers, as it bridges the gap between mechanical stability and practical application in various challenging environments.

Understanding the benefits of geofoam is crucial for highway construction professionals, as it plays an essential role in maintaining infrastructure performance and longevity.