结构-功能一体化智能传感地聚物混凝土本征自感知性能研究

自感应混凝土作为结构/传感功能一体化复合材料，是传统混凝土结构智能化发展的重点方向。本项目针对现有自感应混凝土基体导电性差、导电相分散不均等问题，提出从基体材料与导电相两方面对自感应混凝土进行优化设计：采用导电性能更优异的地质聚合物替代传统水泥提升基体材料的压敏性；同时设计制备负载导电组分的导电骨料替代普通骨料提升导电均匀性，开发基于地质聚合物的高性能本征自感应混凝土，不仅能有效减少碳纤维用量，同时可增强导电相与基体界面粘结力，极大提升材料感知性能。课题将从材料设计-结构应用展开多尺度研究，首先围绕基体材料感知性能调控与导电骨料优化设计展开研究，揭示反应产物组成、微观结构与不同形态导电相的自感知机理；基于此制备高性能地聚物自感应混凝土，开展其在结构健康监测中的应用研究，构建结构应力-应变自检测评价体系，为研发本征类自感应混凝土提供新途径，为智能材料在结构健康监测中的应用提供科学理论依据。

Self-sensing concrete, as a structural/sensing-integrated composite material, is an important topic for the intelligent development of traditional concrete structure. In this study, in order to solve the problems of poor conductivity and uneven dispersion of conductive phases in the existing self-sensing concrete matrix, it is proposed to optimize the design of self-sensing concrete both from the matrix material and conductive phase: the application of geopolymer with better conductivity to replace traditional cement to improve the piezoresistivity of the matrix material; meanwhile, to design and prepare conductive aggregates loaded with conductive components to replace normal aggregates to enhance the conductivity uniformity. The development of high-performance intrinsic self-sensing concrete based on geopolymer can not only effectively reduce the amount of carbon fibers, but also enhance the bonding between the conductive phase and the matrix interface, which is expected to greatly improve the sensing behavior of materials. In this project, multi-scale research will be carried out from material design to structural application. Firstly, research will be carried out on the control of self-sensing property of geopolymer and the optimization of conductive aggregates. The self-sensing mechanism of the reaction products, microstructure and different forms of conductive phases is revealed. Based on this, high-performance self-sensing geopolymer concretes is prepared. The application of self-sensing geopolymer concretes in structural health monitoring is investigated, and the self-evaluating system on the stress-strain in concrete structure is established. This project is expected to provide new insights to the development of innovative intrinsic self-sensing concretes. Meanwhile, it is also expected to establish scientific basis for the application of intelligent materials in structural health monitoring.