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在日本,回收沥青路面材料(RAP)已经得到广泛使用,其再生率可达到99%。然而在考虑CO2排放时,集料回收的效率还不清楚,同时材料的生产、运输、摊铺以及废料处理等对环境产生的一系列影响也还未知。笔者分别针对3种工况(包括新集料、厂拌再生料、就地再生料)来评价沥青路面再生过程中CO2的排放量。结果表明:使用再生料排放的CO2比使用新料排放的要少,而就地再生设备由于有时需要长距离运输会导致CO2排放量增大,但综合比较其排放的CO2仍是最少的。因此,选择再生方式时应考虑环境负荷。
In Japan, recycled asphalt pavement materials (RAPs) have been widely used with a regeneration rate of up to 99%. However, when considering CO2 emissions, the efficiency of aggregate recovery is unclear, and a series of environmental effects such as material production, transportation, paving and waste disposal are still unknown. The author evaluates the emissions of CO2 in the process of asphalt pavement regeneration respectively for three working conditions (including new aggregate, mixed plant recycled material and local recycled material). The results show that the emission of CO2 from recycled materials is less than that from new materials, whereas the CO2 from local regenerative devices is increased due to the long distance transportation. However, the CO2 emissions from the comprehensive comparison are the least. Therefore, the environmental load should be considered when choosing a regeneration method.