In general pavement repair works in Japan, which consist of material production, transportation, construction and disposal, CO_2 emissions during the material production account for about 60% of the total emissions from the whole stages, and about 60% of the emissions during production occurs during the preparation of hot asphalt mixture. Therefore, reducing emissions during this stage should effectively reduce the CO_2 emissions from paving works. In this study, CO_2 emissions during the preparation of hot mix asphalt were investigated by interviewing asphalt plants in Japan and determining the fuel consumptions. The amount of CO_2 emitted for producing warm mix asphalt additives was also estimated to clarify the effects of warm mix asphalt technologies on reducing CO_2 emissions. The study showed that warm mix asphalt technologies reduce CO_2 emissions by about 10% even taking the emissions from the production of additives into account.
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