A Comprehensive Review of the Shear Performance of Recycled Pavement Materials Reinforced with Geogrids
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Abstract
Reuse of recycled asphalt pavement (RAP) has generated immense interest in pavement design because it stands out in terms of performance, economy, and the environment when compared to virgin aggregate. RAP is an eco-friendly alternative to natural aggregates, as about 97 percent of the material is recycled to form new pavement, and the remaining portion is used as foundation course material for the construction of roads. Researchers have looked at RAP's mechanical characteristics, including its stiffness, resilience modulus, and deformation behavior, in great detail. Its behavior in unbound layers is not always the same. Even though RAP has a lot of material and causes more permanent deformation, the research suggests that RAP-VA blends may have the same or even higher modulus and stability. RAP is useful right away, but it has also been shown to improve the performance and stability of subgrade and subbase courses in soils. Geogrids and other geosynthetics are two of the most significant components that improve the mechanical properties of RAP and other recycled materials. Geogrids promote load distribution, bearing capacity, and stiffness while decreasing rutting and settling via interlocking, shear transfer, and the tensioned membrane effect. They are mostly used to build tunnels, keep railways stable, make retaining walls, and make pavements. MSE walls are considered to be cost-effective, long-lasting, and a substitute for retaining walls and embankments. Some researchers have demonstrated improved interface shear strength and long-term performance in geogrid-RAP interaction. In this regard, geosynthetics and RAP are viable alternatives and offer a sustainable solution for new highway construction in a way that reduces raw material requirements and pavement infrastructure strength and durability.
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