Using Crushed Recycled Glass In Asphalt Pavement

Abstract

Multiple countries across the globe have shifted their attention from virgin aggregate to the possibility of utilising recycled materials in asphalt pavements. The possibility of using waste glass as an alternative to virgin aggregate has gained momentum, with laboratory tests continuing to show promising results. In the US, the practice began in the 1990s, when some states, such as New York, ratified policies allowing waste materials to be used for road pavement. Since then, some countries across Europe and North America have followed suit and are slowly incorporating waste materials, such as glass particles, into asphalt pavement at levels of 5% to 15%. Research into the use of waste glass demonstrates that it is as environmentally friendly as virgin bitumen. While the incorporation of waste glass in asphalt pavement may indeed release some harmful elements, their eventual impact is negligible. Most of the available laboratory results also confirm that with slight improvements, waste glass can be an appropriate alternative to virgin aggregate. Additionally, lower proportions of waste glass are associated with increased performance and durability. The findings from the explored studies reveal the importance of keeping the amounts of waste in bitumen low to avoid rapid cracks triggered by high temperatures. Overall, the results suggest that the percentage of waste glass in bitumen should be kept at a significantly low level to achieve optimal results. On the other hand, laboratory tests were conducted by adding 10% of fine waste glass instead of fine virgin aggregate.  The need for sustainable and eco-friendly infrastructure solutions drives the growing interest in utilizing recycled materials for asphalt pavements. Waste glass has emerged as a viable alternative to virgin aggregate due to its abundance and potential to reduce the environmental impact of road construction projects. European and North American countries, inspired by the successful practices in the US, are taking measured steps to incorporate glass particles in asphalt pavements, aiming to strike the right balance between performance and waste reduction. As the demand for greener road construction materials rises, ongoing research continues to explore new ways to optimize the use of waste glass, ensuring its long-term effectiveness and safety. While laboratory results have generally been promising, real-world implementation and long-term monitoring will be essential to validate the performance and durability of asphalt pavements containing waste glass.