为了计算沥青路面养护过程中的能耗和CO2排放基准值，构建了沥青路面养护工程原材料 加工、混合料生产、材料运输和施工阶段的能耗与CO2排放评价体系，并以CO2排放强度和年化 CO2排放强度为核心指标，定量评价了温拌沥青混合料、同步碎石封层、再生沥青混合料、超薄 磨耗层等技术的CO2排放强度。评价结果表明：同步碎石封层、稀浆封层、超薄磨耗层等预防性 养护技术均具有良好的节能减排效果；与热拌沥青混合料相比，温拌沥青混合料减排16%，可有 效降低沥青混合料生产阶段的CO2排放量；与普通热拌沥青混合料（HMA） 相比，添加50%旧沥 青混合料的HMA减排33.2%；采用温拌添加旧沥青混合料的技术减排效果更加显著，温拌加50% 旧沥青混合料生产沥青混合料的CO2排放强度相比普通HMA，下降了49.3%。

An evaluation system of energy consumption and CO2 emission during raw material produc⁃ tion, asphalt mixture manufacturing, material transportation and construction of asphalt pavement main⁃ tenance engineering was established, so as to calculate the benchmark values of energy consumption and CO2 emission for maintenance activities. Two key evaluation indicators, CO2 emission intensity and annu⁃ alized CO2 emission intensity, were used to evaluate the CO2 emission intensity of warm mix asphalt (WMA), synchronous surface dressing, recycled asphalt mixture and ultra-thin wearing course. The re⁃ sults show that asphalt pavement preventive maintenance technologies, including synchronous surface dressing, slurry seal and ultra-thin wearing course, have resulted in energy saving and CO2 emission re⁃ duction effects. Warm mix asphalt (WMA) can reduce about 16% CO2 emission intensity compared to hot mix asphalt (HMA), which is mainly accomplished in the mixture production stage. HMA incorporat⁃ ing 50% reclaimed asphalt pavement (RAP) can reduce 33.2% CO2 emission intensity compared to vir⁃ gin HMA. WMA incorporating RAP have resulted in energy saving and CO2 emission reduction effects, incorporating 50% RAP can reduce 49.3% CO2 emission intensity compared to virgin HMA.