4.2.2. Construction Stage

In the construction stage, the amount of CO2 emissions can be analyzed using the amount of fuel and electricity consumed for each work type. In order to do this, equipment that was used at the actual construction site was categorized as shown in the construction stage data in Table 4, and the number of construction equipment work types that were used was analyzed in detail. Results showed that most of the equipment was used on reinforced concrete work, and that the 50-ton mobile crane was used in more work types than was other equipment. Electricity consumption was estimated by multiplying the emissions factor by the amount of electricity used in the field office, and the resulting value was estimated by considering the total area and the total value of the calculated fuel consumption and electricity consumption. After analyzing the construction process, the amount of fuel consumed was found to be 0.32 kg-CO2/m2, the amount of electricity consumed was 2.97 kg-CO2/m2, and the total amount of carbon emissions in the construction stage was 3.29 kg-CO2/m<sup>2</sup> as shown in Figure 6. After analyzing the reinforced concrete work from the construction stage; fuel and electricity consumption accounted for around 31% of all work types. Among other work types, waterproof construction took up 9%, and plastering took up 8%. With regard to the amount of CO2 emissions in the construction stage, high CO2 emission characteristics were expected according to the construction method and equipment that was used at the actual site, but the amount of emissions was relatively low compared to the preceding transportation stage.


