The Research On Carbon Emissions Of Different Structural Materials In Bridge Life Cycle

With the global warming trend has become increasingly evident that more and more countries and regions are beginning to realize the importance of energy conservation, and participated in international cooperation in related fields actively, how to reduce greenhouse gas emissions have become the focus of attention by the international community. It also has an environmental problem in the rapid development of our country economy and civil industry. The life cycle of bridge structure in the construction process on the one hand consumes a lot of resources, on the other hand produces a certain amount of environmental pollution and greenhouse gas emissions. To this end, we meet the smooth traffic, but also to some extent, improve the current bridge construction process to achieve low-carbon construction requirements to ensure that social and economic sustainable development. Theories and methods of life cycle assessment is proceeding from the entire life time of the product, to seek effective ways to reduce resource consumption and environmental impact.Life cycle assessment method has been called one of the methods of effective environmental management tools of the new century. It is based on the product or service material, energy consumption and environmental emissions, from the cradle to the grave throughout the entire life cycle environmental impact, to access a comprehensive, standard evaluation, as well as the consumption, emission potential impacts on the environment, looking for the reduction and elimination of these environmental impact ways. The research on bridge carbon emissions, based on life cycle assessment, is using the ideas and methods of LCA to introduce and apply to the bridge field, to promote the sustainable development of bridges and related industries.This article studied the bridge life cycle carbon emissions systematically according to the life cycle assessment framework, to improve the bridge life cycle carbon emissions calculation method, and to analysis the Luo Harbor Bridge of Wuhan City under the different structure material. In addition, the bridge throughout the life cycle inventory data for each stage contains many aspects. In the design phase, the bridge doesn't discharge actual carbon, but have an important impact on carbon emissions throughout the bridge life cycle, The different carbon emissions is main from the production of building materials, bridge construction, operation and maintenance, and removal of abandoned stages. According to the content of the study, inventory data and the main influencing factors, appropriate to assume the boundary of the research system, the research focus on four stages of the substance of carbon emissions, doesn't contain the bridge planning and design stage as the scope of the evaluation of the research content. In the article, we calculated the various stages of carbon emissions for Luo Harbor Bridge, which make from concrete beams and steel-concrete composite beam structure. In the last passage, we compared carbon emissions in different bridge types. According to the results of the evaluation of the life cycle, it can be seen that the choice of different structural materials bridge and steel recycling will reduce greenhouse gas emissions largely.