Welcome to the Carbon Footprint Calculator for Prestressed Concrete Highway Bridges

1. Introduction

This calculator developed by Feng-Chia University for Directorate General of Highways, MOTC calculates the carbon footprint of prestressed concrete bridges. Prestressed concrete bridges that can be applied include the prestressed I-girder bridge, and prestressed box-girder bridges that are constructed by the span-by-span method, the advancing shoring method, the cast-in-place balanced cantilever method, or the precast segmental method. It requires a minimum of data for planners and preliminary design quantities for designers to generate the result. The percentage contributions of the phrases are graphically presented in pie charts showing the relative proportions due to materials, transportation, maintenance, demolition and abandonment. These results can also be exported to an Excel file, allowing a bridge planner and/or designer to identify the major CO2 burdens of various types of prestressed concrete bridges and various construction methods to be compared, and enabling planners and/or designers to increase the CO2 efficiency of their projects.

2. Boundary Conditions

The calculator will help bridge engineers quantify the life cycle carbon emissions of a bridge, including those related to materials, transportation of materials, construction, daily energy consumption, maintenance, demolition and abandonment. The following environmental burdens are not considered:
1. Production of energy and the mining of minerals.
2. Planning, design and supervision of the bridge.
3. Excavation and backfill of earthwork.
4. Removal and replanting of vegetation on construction site.
5. Transportation and activity of construction workers.
6. Traffic delays during construction and maintenance.