关键词: 道路工程, 沥青路面, 热再生, 能耗, 温室气体, 节能减排

Abstract: Life cycle assessment (LCA) method was adopted to accurately evaluate the environmental benefits of asphalt pavement hot recycling technologies. The evaluation index system of energy conservation and emission reduction was established. Through field investigation and data analysis, the energy consumption and greenhouse gas emission (GHG) of milling and repaving (M&R), hot in-place recycling and hot in-plant recycling technologies were calculated respectively. The environmental benefits of energy conservation and emission reduction and recycling were evaluated. The results show that, compared with M&R, hot in-place recycling technologies can save more than 30% energy consumption and realize 100% recycling of old pavement materials. And for hot in-plant recycling, the energy consumption and GHG is slightly higher when the content of RAP is 10%;the energy conservation and emission reduction benefits is obvious when the RAP content reaches 30% and 50%, meanwhile, the old pavement materials can be recycled at different degrees.

Key words: highway engineering, asphalt pavement, hot recycling technologies, energy consumption, greenhouse gas, energy conservation and emission reduction