686733721

Final report; 2008-2009.

NTL-HIGHWAY/ROAD TRANSPORTATION-Materials ; NTL-ENERGY AND ENVIRONMENT-Environment Impacts ;

The objective of this study is to quantify the energy and environment impacts from using recycled materials for highway construction. Specifically, when recycled asphalt pavement is re-used for producing hot mix asphalt or when recycled concrete aggregate is used in concrete, how much energy will be utilized and how much are the greenhouse emissions. This study quantified the impact of using recycled asphalt pavement (RAP) in hot mix asphalt and recycled concrete aggregate in concrete on energy consumption and greenhouse gas emission. For RAP, the impact on energy consumption and greenhouse gas emission is affected by a few factors, such as moisture content in RAP, hot mix asphalt discharge temperature and RAP content. A mathematical model was developed to determine the impact. For recycled concrete aggregate for concrete production, impact on energy consumption and greenhouse gas emission is largely affected by transporting distances. A simple model was also developed for recycled concrete aggregate.

US Transportation Collection