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Multi-objective optimization for asphalt pavement maintenance plans at project level: Integrating performance, cost and environment

机译：项目级别的沥青路面养护计划多目标优化：整合性能，成本和环境

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Traditionally, asphalt pavement maintenance mainly considers pavement performance and cost and largely ignores the environment while substantial amount of environmental burdens are released in the process. In this study, a multi-objective optimization model was developed integrating the three elements in order to optimize the asphalt pavement maintenance plans at the project level. Pavement performance element was decided as the multiplier of pavement serviceability index and traffic volume. Cost element was represented by the net present value, including components of agency cost, vehicle operation cost and salvage value. Environmental element, integrating energy consumption, global warming potential, acidification potential and respiratory effects potential, was measured by the life cycle assessment model. A hypothetic asphalt pavement maintenance case study was conducted using the developed multi-objective optimization model and harvested 103 sets of feasible combinations of maintenance plans, each of which is non-dominated by the others. Trade-offs analysis was performed among the three objectives and visualized in both two- and three-dimension forms. It is found there is an opportunity of reducing the cost and environmental impacts to 80.3% and 77.8% and increasing the pavement performance to 146.6% compared to the base case. However, they are mutually compromised and cannot be reached simultaneously. The developed model reveals the quantitatively interactive relationship of the three objectives and helps optimize the asphalt pavement maintenance plans. (C) 2015 Elsevier Ltd. All rights reserved.
机译：传统上，沥青路面养护主要考虑路面性能和成本，而很大程度上忽略了环境，同时在此过程中释放了大量的环境负担。在这项研究中，开发了一个综合了这三个要素的多目标优化模型，以便在项目级别优化沥青路面的养护计划。路面性能要素被确定为路面可服务性指数和交通量的乘积。成本要素以净现值表示，包括代理成本，车辆运营成本和残值的组成部分。通过生命周期评估模型对环境要素进行了综合测量，包括能源消耗，全球变暖潜力，酸化潜力和呼吸作用潜力。使用已开发的多目标优化模型进行了假设的沥青路面养护案例研究，并收集了103套可行的养护计划组合，每套养护计划均互不相干。在这三个目标之间进行了权衡分析，并以二维和三维形式可视化。发现与基本情况相比，有机会将成本和环境影响降低到80.3％和77.8％，并将路面性能提高到146.6％。但是，它们是相互妥协的，不能同时达到。开发的模型揭示了三个目标之间的定量交互关系，并有助于优化沥青路面养护计划。 （C）2015 Elsevier Ltd.保留所有权利。

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