Experimental Study and Theoretical Modeling of High Performance Recycled Aggregate Concrete

“这项奖励是根据2009年美国复苏和再投资法案（公法111-5）资助的。”废旧基础设施混凝土骨料的回收利用正成为美国乃至世界建筑业可持续发展的重要研究课题。为了解决这个问题，本研究的目的是确定和设计再生骨料和水泥膏体之间的最佳界面，从而实现高性能再生混凝土。为了实现这一目标，该方法将由三个部分组成。第一个组成部分将确定用于处理再生骨料的表面处理方法，以使所得再生混凝土的性能与常规混凝土相匹配。第二阶段将结合理论和实验研究，量化集料/水泥浆界面区的行为和断裂。第三，这些结果将被纳入一个多尺度计算模型，以便将再生混凝土的微观结构与其结构性能和抗断裂性联系起来。在社会效益方面，本研究将解决拆除混凝土的废物处理和运输的成本和环境影响日益严重的问题。使用现场破碎的混凝土颗粒作为集料的能力将为低成本、高性能和生态友好型基础设施的建设提供可持续的解决方案。此外，该项目为研究生提供了一个独特的机会来研究开发高性能再生混凝土的实验、分析和数值方法。学生将有机会在一个非常重要的实际工程问题中应用理论建模工具，并对我们国家的可持续发展有一些见解。美国基础设施体系。

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Recycling concrete aggregates from demolished infrastructure is becoming an important research topic for sustainable development of the construction industry in the U.S. and the world. To addresses this issue, the objective of the present research is to identify and design an optimal interface between recycled aggregate and cement paste that will lead to high-performance recycled concrete. To achieve this goal, the method will consist of three components. The first component will identify a surface treatment method for processing recycled aggregates to match the properties of the resulting recycled concrete with regular concrete. The second stage will combine theoretical and experimental studies to quantify the behavior and fracture of the aggregates/cement paste interfacial zone. Thirdly, these results will be incorporated into a multiscale computational model in order to relate the microstructure of recycled concrete to its structural performance and fracture resistance.In terms of societal benefits, this research will address the increasing problem of the cost and environmental impact of waste disposal and transportation of demolished concrete. The ability to use on-site crushed concrete particles as aggregates will provide a sustainable solution for the construction of low cost, high performance and ecologically friendly infrastructures. Moreover, this project provides a unique opportunity for graduate students to study experimental, analytical and numerical methods for developing high performance recycled concrete. The students will have an opportunity to apply theoretical modeling tools in a very important practical engineering problem and have some insight on the sustainable development of our nation?s infrastructure system.