ABSTRACT
In this contribution a social cost-benefit analysis tool for asphalt structures on steel bridges is presented that enables decision makers to choose between different maintenance options. Asphalt structures on steel bridges require regular replacement. This causes hindrances for traffic flow and the can have environmental and health impacts due to material and energy use. The developed tool includes the calculation of direct costs, external costs such as environmental costs related to construction materials and processes, and external costs caused by reduced availability of the bridge during construction works. Material properties as well as maintenance cycles can be included in the assessment. The tool supports the selection of the combination of materials and processes with the least direct, social and environmental costs. To illustrate the function of the tool, comparisons are calculated for the Merwede Bridge in The Netherlands. The results show that replacement of materials with longer lifetimes can have economic as well as environmental and traffic benefits.
