The paper eplores the problems, vision, definition and design parameters for sustainability, the uses a case study to demonstrate and compare current bridge design with a more sustainable solution using Ultra-High Performance Concrete (UHPC). Bridges that are designed to optimize the mechanical properties of UHPC have different initial costs, maintenance and operation costs and environmental footprints. UHPC is still a relatively new material; however its durability properties, which include extremely low permability, are typically an order of magnitude superior to High Performance Concrete (HPC). Using this material in an optimized design which minimizes initial material consumption and provides a very long design life can create a paradigm shift in how sustainable infrastructure may be viewed. An order of magnitude increase in design life will approach the current usage of life of European cathedrals or Roman coliseums. The paper not only explores the embodied CO2 and energy consumption during initial bridge construction but also over the life cycle, which includes issues such as the environmental impact of traffic disruption and rehabilitation equipment. “It is our attitude at the beginning of a difficult task which, more than anything else, will affect its successful outcome.” –William James, American philosopher
