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Metham, M and Benjaoran, V (2015) The assessment of greenhouse gas emissions for evaluating actual road construction operations. In: Raiden, A and Aboagye-Nimo, E (Eds.), Proceedings 31st Annual ARCOM Conference, 7-9 September 2015, Lincoln, UK. Association of Researchers in Construction Management, 257–266.
- Type: Conference Proceedings
- Keywords: greenhouse gas, monitoring, resource-utilization, road construction
- ISBN/ISSN: 978-0-9552390-9-0
- URL: http://www.arcom.ac.uk/-docs/proceedings/ab3cbeeeed20eb478608264af820232d.pdf
- Abstract:
Assessment of greenhouse gas emissions of products using the life cycle inventory analysis (LCI), can be performed in both the pre- and/or post-construction phases of road construction. For the pre-construction phase, a bill of quantity (BOQ) is used to calculate emissions, whereas, in the post-construction phase, emission calculations are based on the actual work done. Road construction is one of the construction sectors which requires long project time and a great deal of machinery. The actual amount of total resources used is probably different from that which is stated in the BOQ. In general, greenhouse gas assessments consider only data from either the pre-construction phase or the post-construction phase. However, it is possible to control and monitor actual resource-utilization by comparing change at the post-construction phase in relation to the pre-construction phase. This can reveal construction operation performance and lead to the development of methods or construction operations resulting in a reduction of greenhouse gas emissions. The current research uses three road construction projects as case studies. It aims to improve the EIO-based inventory calculations of machinery used in road construction by adjusting the proportion of usage hours for that machinery. It achieves this by comparing actual data relating to energy, materials and machinery consumption with BOQ data. The results of this comparison help to identify the factors and causes that influence operational performance (in terms of greenhouse gas emissions) and lead to improvements in road construction operations. The key findings from emission calculation between pre and post-construction phases were that the project A had decreased the greenhouse gas emissions by 3.8%, contradictory with project B and C which had increased more gas emissions by 5.0% and 0.6% respectively. Considering with these figures it is reflected the resource management efficiency of each project. The main cause of greenhouse gas emissions on each project was the usage machinery which depended on the project period.