Description
Given the high consumption of natural resources, sidewalks are considered one of the most cost-intensive pieces of infrastructure. The use of recycled concrete aggregates in road pavements can provide a beneficial approach to improving economic, social and environmental sustainability. RCA is considered a multi-layered solution that protects natural resources, minimizes road construction costs, and limits harmful emissions.
Research has found that RCA can be effectively applied to a variety of pavement layers, including base and surface layers. It was also observed that the mechanical and physical properties of RCA can be studied and compared with those of natural aggregates. Additionally, several technologies that can be used to improve RCA performance on pavement are revealed.
Although RCA may be considered a viable and sustainable alternative to NA in pavement applications, recommendations regarding replacement rates in asphalt mixtures still vary widely.
To ensure a balance between sustainability, functionality and quality of pavements, the continued rollout of RCA implementation relies on in-depth research leading to a unified and homogeneous set of standards and specifications. This article highlights the role of RCA as an important driver of sustainable road construction as well as circular economy strategies. It may also call for advanced research and shared decision-making to realize the full potential of RCA.
