Effect of Crushed Glass on Behavior of Crushed Recycled Pavement Materials Together with Crumb Rubber for Making a Clean Green Base and Subbase

One of the most destructive environmental issues around the world is the disposal of construction and demolition (C&D) wastes such as recycled concrete aggregate (RCA), crushed rock (CR), waste glass, and scrap tire. Therefore, using the waste materials in civil projects such as road pavement applications would significantly reduce the consumption of quarry-based virgin materials, alleviate landfill disposal, and minimize greenhouse emissions. Numerous studies have evaluated the effect of crushed glass (CG) for construction applications; however, the effect of CG on the behavior of the crushed recycled materials together with crumb rubber (R) have never been studied for road pavement applications. A series of geotechnical laboratory tests, including modified compaction, unconfined compression strength, California bearing ratio (CBR), and resilient modulus tests, have been done on the blends of different percentages of CG added to the RCA and CR aggregates, together with R for pavement base/subbase applications. The results indicated that the blends of the waste materials, as a low carbon concept, could be a viable and satisfactory alternative solution for future base/subbase applications.