**5. Conclusions**

This is part of a study for the reduction and managemen<sup>t</sup> of CO2 emissions from construction processes during the entire life cycle of buildings. The purposes of this study was to sugges<sup>t</sup> a CO2 emissions assessment method for each stage of the apartment housing construction process, and to analyze CO2 emissions characteristics by stage for each of the 13 types of the construction work using construction records from actual work sites. From these, the following conclusions were obtained.


As a result of analyzing CO2 emission characterized by construction type, it was found that in the case of reinforced concrete construction, which has the highest CO2 ratio, the amount of emission was higher in the transportation phase than in the construction phase. This proved that the assumption that transportation distance greatly contributes in CO2 emission during the construction work. Therefore, when the work of reinforced concrete construction is supplied and received, it is analyzed that managemen<sup>t</sup> of fuel mileage is necessary for CO2 emission reduction due to construction work.

In order to reduce carbon emissions during the construction process, it is considered that priority should be given to the reduction of the shipment distance of concrete and the use of high-efficiency transportation equipment in the reinforced concrete construction with the greatest CO2 emission.

**Acknowledgments:** This research was supported by a gran<sup>t</sup> (Code 18CTAP-C129766-02) from Construction Technology Research Program (CTIP) funded by Ministry of Land, Infrastructure and Transport.

**Author Contributions:** All authors contributed substantially to all aspects of this article.

**Conflicts of Interest:** The authors declare no conflict of interest
