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

摘要： 为了精确评估沥青 路面热再生养护技术的环境效益，采用寿命周期评价方法，建立了节能减排评价指标体系，通过现场调查及数据分析，分别测算了铣刨重铺、就地热再生 和厂拌热再生技术的能耗及温室气体排放，评价了节能减排和循环利用效益。结果表明：与铣刨重铺相比，就地热再生技术可节约30%以上能耗， 100%循 环利用旧路面材料；厂拌热再生在RAP料掺量为10%时，能耗和温室气体排放略高，RAP掺量为30%和50%时，具有明显的节能减排效益，同时可不同程度循 环利用旧路面材料。

关键词: 道路工程, 沥青路面, 热再生, 能耗, 温室气体, 节能减排