基于地聚合反应的废弃混凝土完全再生利用机理

废弃混凝土的再生利用已成为我国工程建设及环保领域的重大需求，基于地聚合反应可以实现废弃混凝土的完全再生利用，但目前对地聚合物再生混凝土的作用机理仍缺乏清楚的认识，存在地聚合物组分配比难以确定、再生混凝土力学及耐久性的性能不足等技术难题，这极大地阻碍了废弃混凝土完全再生利用的工程实现。项目采用宏观物理力学试验、微观特征试验与分子动力学模拟相结合的方法，重点研究废弃混凝土粉体地聚合反应特征和微观机制、废弃混凝土粉体活化改性及其协同胶凝强化作用、地聚合物再生混凝土界面过渡区特征与界面作用机理及地聚合物再生混凝土耐久性变化的本质,为突破废弃混凝土完全再生利用的技术瓶颈、实现工程上废弃混凝土完全再生利用提供科学支撑。项目研究目标明确，方法独特，创新显著，其研究成果对揭示基于地聚合反应的废弃混凝土完全再生利用机理具有重要的科学意义，对实现废弃混凝土完全再生利用、节约资源和保护环境具有重要的实际价值。

Recycling of waste concrete has become a major demand in the sectors of engineering construction and environmental protection. Waste concrete can be completely recycled on the basis of geopolymerization. However, the mechanisms for the geopolymerization of waste concrete has not been clear yet. Accordingly, the components of geopolymer are difficult to decide, and the mechanical properties and durability are often not satisfactory. This has obviously hindered the realization of complete recycling and utilization of waste concrete in actual cases. This project will jointly employ physical and mechanical tests, microscopic characteristics tests, and molecular dynamics simulation to investigate the key issues for complete recycling of waste concrete. They include the reaction characteristics and micro-mechanism of the geopolymerization of powder of waste concrete, activated modification and coordinated reinforcement of cementation of powder of waste concrete, the characteristics of interfacial transition and the reaction mechanism for interfaces of geopolymer-based recycling concrete, and the essential reasons for the changes of durability of geopolymer-based recycling concrete. Solving these problems can provide scientific supports for breaking through technical bottlenecks in complete recycling of waste concrete and for applying the recycled concrete in actual engineering cases. This project has specific aims and involves new ideas and novel methods. The outcomes of this project have significant scientific meanings for the deep insight of the mechanisms for geopolymer-based complete recycling of waste concrete, and have great practical values for making full use of waste concrete, saving resources, and protecting environment.