| In Japan, reclaimed asphalt pavement (RAP) has been used, and the recycling rate of those is now 99%. It means that the asphalt pavement is an effective recycling material. However, the effectiveness of aggregate recycling in terms of CO2 emissions remains unclear and the total environmental load including material production, transportation, paving work, and waste disposal is not known.In this study, the CO2 emissions of pavement recycle methods were estimated for three cases using virgin aggregates, plant recycling aggregates, or in-place recycling. The results showed that the CO2 emissions when using recycled aggregates were less than when using virgin materials, and were far less in the case of in-place recycling, although the CO2 emissions sometimes increase when the machines for the in-place recycling need to be transported long distances. Thus, recycling methods should be selected in consideration of environmental loads. |
