Recycled Concrete Aggregates for New Concrete Buildings for sustainability

用于新建混凝土建筑的再生混凝土骨料以实现可持续发展

• 批准号: 1436758
• 负责人: Yahya Kurama
• 金额: $ 27.5万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2018-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1436758&HistoricalAwards=false
• 关键词: Recycled; Concrete; Aggregates; New; Buildings

Concrete is one of the most versatile building materials and has facilitated industrial growth in the last century. However, it is difficult to get rid of concrete waste when concrete buildings are demolished. Crushed old concrete is recycled as aggregates in highway pavements but it is not used in buildings and bridges because of uncertainties of performance of new concrete. If crushed old concrete can be recycled in new building construction it would help in getting rid of waste and preserve natural riverbed rocks. This project will pursue research in classifying old crushed concrete for its use as aggregate in new concrete for buildings and bridges. Properties such as strength, durability, long-term deformation will be determined for concrete made with recycled concrete. As the nations infrastructure goes through upgrading, the volume of available waste concrete will increase. Use of this waste concrete in new concrete will reduce environmental impact of storing the waste and preserving natural environment of riverbeds.Structural concrete made with recycled concrete aggregates can have significant variability in the behavior of buildings and bridges regarding deformations, creep and durability. The project will pursue experimental and analytical research to seek answers to these questions: (1) what are the economic and environmental benefits of recycling concrete in structures? (2) what are the long-term service load and design load performances of structural members, including prestressed concrete members? (3) how do recycled concrete aggregates affect durability? and (4) what modifications, if any, need to be made to crushed concrete to enhance performance of new concrete? The project will assess mechanical properties of concrete made with crushed concrete as aggregates. Also, beams and columns made of recycled concrete will be tested in laboratory to establish performance of structural components. Ultimately, the project will develop performance-based requirements, mix design guidelines, acceptance tests, and structural design/analysis/construction guidelines to achieve acceptable performance of concrete members using recycled concrete aggregates.

混凝土是用途最广的建筑材料之一，在上个世纪促进了工业增长。然而，当混凝土建筑被拆除时，混凝土垃圾很难去掉。碾压后的旧混凝土作为骨料在公路路面上循环使用，但由于新混凝土性能的不确定性，它不能用于建筑和桥梁。如果破碎的旧混凝土可以在新建筑中回收利用，这将有助于消除废物和保护天然河床岩石。该项目将继续研究如何对旧的破碎混凝土进行分类，以便将其用作建筑和桥梁的新混凝土的骨料。用再生混凝土制成的混凝土的强度、耐久性和长期变形等性能将被确定。随着国家基础设施的升级，可利用的废混凝土数量将会增加。在新混凝土中使用这种废弃混凝土将减少储存废物和保护河床自然环境的环境影响。用再生混凝土骨料制成的结构混凝土可以在建筑物和桥梁的变形、徐变和耐久性方面产生显著的变化。该项目将进行试验和分析研究，以寻求以下问题的答案：(1)再生混凝土在结构中的经济和环境效益是什么？(2)包括预应力混凝土构件在内的结构构件的长期使用荷载和设计荷载性能是什么？(3)再生混凝土骨料对耐久性有何影响？以及(4)需要对碾碎的混凝土进行哪些修改，以提高新混凝土的性能？该项目将评估以碾碎混凝土作为骨料制成的混凝土的力学性能。此外，由再生混凝土制成的梁和柱将在实验室进行测试，以确定结构组件的性能。最终，该项目将制定基于性能的要求、配合比设计指南、验收测试和结构设计/分析/施工指南，以实现使用再生混凝土骨料的混凝土构件的可接受性能。