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Assessment and life-cycle analysis of recycled materials for sustainable highway.

机译：可持续公路的再生材料评估和生命周期分析。

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摘要

Recycled materials replacing part of virgin materials in highway applications has shown great benefits to the society and environment. Beneficial use of recycled materials can save landfill places, sparse natural resources, and energy consumed in milling and hauling virgin materials. Low price of recycled materials is favorable to cost-saving in pavement projects. Considering the availability of recycled materials in the State of Maryland (MD), four abundant recycled materials, recycled concrete aggregate (RCA), recycled asphalt pavement (RAP), foundry sand (FS), and dredged materials (DM), were studied. A survey was conducted to collect the information of current usage of the four recycled materials in States' Department of Transportation (DOTs). Based on literature review, mechanical and environmental properties, recommendations, and suggested test standards were investigated separately for the four recycled materials in different applications. Constrains in using these materials were further studied in order to provide recommendations for the development of related MD specifications. To measure social and environmental benefits from using recycled materials, life-cycle assessment was carried out with life-cycle analysis (LCA) program, PaLATE, and green highway rating system, BE 2ST-in-Highway(TM).;The survey results indicated the wide use of RAP and RCA in hot mix asphalt (HMA) and graded aggregate base (GAB) respectively, while FS and DM are less used in field. Environmental concerns are less, but the possibly low quality and some adverse mechanical characteristics may hinder the widely use of these recycled materials. Technical documents and current specifications provided by State DOTs are good references to the usage of these materials in MD. Literature review showed consistent results with the survey. Studies from experimental research or site tests showed satisfactory performance of these materials in highway applications, when the substitution rate, gradation, temperature, moisture, or usage of additives, etc. meet some requirements. The results from LCA revealed significant cost savings in using recycled materials. Energy and water consumption, gas emission, and hazardous waste generation generally showed reductions to some degree. Use of new recycled technologies can contribute to more sustainable highways.
机译：在公路应用中，用再生材料代替部分原始材料已显示出对社会和环境的巨大好处。有益地使用再生材料可以节省垃圾填埋场，稀疏的自然资源以及碾磨和运输原始材料所消耗的能源。再生材料价格低廉，有利于节约路面工程成本。考虑到马里兰州（MD）的再生材料的可用性，研究了四种丰富的再生材料，再生混凝土骨料（RCA），再生沥青路面（RAP），铸造砂（FS）和疏materials材料（DM）。进行了一项调查，以收集美国运输部（DOT）中四种回收材料的当前使用情况的信息。根据文献综述，对四种回收材料在不同应用中的机械和环境性能，建议和建议的测试标准进行了单独研究。进一步研究了使用这些材料的限制，以便为制定相关的MD规范提供建议。为了衡量使用回收材料带来的社会和环境效益，使用生命周期分析（LCA）程序Palate和绿色高速公路评级系统BE 2ST-in-Highway（TM）进行了生命周期评估。指出RAP和RCA分别在热拌沥青（HMA）和分级集料基础（GAB）中广泛使用，而FS和DM在现场使用较少。对环境的关注较少，但是可能的低质量和某些不利的机械特性可能会阻碍这些回收材料的广泛使用。国家DOT提供的技术文件和当前规范是在MD中使用这些材料的良好参考。文献综述显示与调查结果一致。来自实验研究或现场测试的研究表明，当替代率，等级，温度，湿度或添加剂的使用等满足某些要求时，这些材料在公路应用中具有令人满意的性能。 LCA的结果表明，使用再生材料可节省大量成本。能源和水的消耗，气体的排放以及有害废物的产生总体上有所减少。使用新的回收技术可以促进高速公路的可持续发展。

著录项

  • 作者

    Zhang, Yating.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Civil engineering.
  • 学位 M.S.
  • 年度 2016
  • 页码 324 p.
  • 总页数 324
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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