Abstract
This study proposes an inventory analysis method to evaluate the greenhouse gas (GHG) emissions from Portland cement concrete pavement construction, based on a case project in the west of China. The concrete pavement construction process was divided into three phases, namely raw material production, concrete manufacture and pavement onsite construction. The GHG emissions of the three phases are analyzed by a life cycle inventory method. The CO2e is used to indicate the GHG emissions. The results show that for 1 km Portland cement concrete pavement construction, the total CO2e is 8215.31 tons. Based on the evaluation results, the CO2e of the raw material production phase is 7617.27 tons, accounting for 92.7% of the total GHG emissions; the CO2e of the concrete manufacture phase is 598,033.10 kg, accounting for 7.2% of the total GHG emissions. Lastly, the CO2e of the pavement onsite construction phase is 8396.59 kg, accounting for only 0.1% of the total GHG emissions. The main greenhouse gas is CO2 in each phase, which accounts for more than 98% of total emissions. N2O and CH4 emissions are relatively insignificant.
Highlights
Environmental issues are becoming an increasing priority for both the government and the private sector
The results showed that reducing costs by 1 Euro can save up to 7.5 kg in CO2 emissions, and that optimal solutions with lower costs may have a satisfactory
The results show that 92.7% of the total emissions in the case project came from the raw material production phase, while only from the concrete manufacture and the
Summary
Environmental issues are becoming an increasing priority for both the government and the private sector. The emphasis has gradually shifted from a site-specific focus on environmental degradation to include the product supply chain. Greenhouse gases (GHG) and their effect on the climate have been in the spotlight with respect to policy and legislation, as well as to general concern by the public. Perceived as an invaluable asset for the development of a robust economy, the highway network has become a primary mode of transportation and a driver of economic growth in China. Large investments were put into the highway infrastructure. Consideration of the environmental impacts of building such a system, only began recently. Green construction and sustainable development have emerged as a solution to the conflict between our growing economy and the weakened environment
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