Abstract
In this paper, we propose a calculation method of carbon dioxide (CO2) emissions due to (1) depreciation, maintenance, and storage of construction equipment, and (2) depreciation of construction material plant.
(1) CO2 emissions due to depreciation, maintenance, and storage of construction equipment Previous studies have confined their scope on depreciation. The proposed method expands the scope. The new scope includes maintenance and storage of construction equipment as well as depreciation. This expansion makes calculation of CO2 emissions more comprehensive and coherent. The scope agrees with the definition of "operating loss prevention cost" in cost estimation. We introduced a CO2 emissions coefficient per unit operation day and unit equipment mass.
(2) CO2 emissions due to depreciation of construction material plant We focused on "capital depreciation" sector in input-output table. By using a large input-output table including capital depreciation sector, the CO2 emissions corresponding to capital depreciations were added on those of construction materials.
Some case studies showed that (1) and (2) are important to calculate the whole CO2 emissions related to construction activities and to compare the CO2 emissions of different construction techniques. The introduced CO2 emissions coefficient is valid for major construction machines, while it has considerable error for the some other machine types. We analyzed the causes.
