What is the effect of adding reclaimed asphalt pavement (RAP) to new asphalt mixes?

Adding reclaimed asphalt pavement (RAP) to new asphalt mixes is a well-established practice in the asphalt industry, primarily because it yields several benefits when properly managed. The inclusion of RAP can significantly reduce material costs since it allows for the re-use of existing asphalt, which lowers the demand for new materials. This not only helps in conserving natural resources but also minimizes waste, contributing to environmentally sustainable construction practices.

Additionally, when managed correctly—such as by carefully controlling the proportion of RAP used and ensuring high-quality materials—the properties of the new asphalt mix can be enhanced. RAP can contribute to improved performance characteristics like better durability and resistance to deformation, thereby leading to a more robust final product. The performance can be optimized by considering factors such as the type and quality of the original asphalt used in the RAP and the overall design of the new mix.

Hence, the correct answer highlights the dual benefit of cost reduction and potential enhancement of mix properties that comes with the intentional use of RAP in asphalt mixtures.