Abstract：Carbon fiber possesses piezoresistive effect, which enable it to have self-sensing capabilities. It offers advantages such as lower cost, enhanced durability, larger sensing volume, and uncompromised mechanical performance. Together with its superior mechanical and electrical properties, carbon fiber is an intelligent tri-functional material for structural strengthening, corrosion resistance and self-sensing without the need to install or integrate additional sensors. This presentation will give an overall introduction of the piezoresistive effect of carbon fiber bundles, carbon fabric reinforced cementitious matrix (CFRCM) and its potential applications. The resistance calculation theory was established by combining the parallel circuit theory. The single or combined effect of temperature, water content, and chloride ion on the piezoresistive effect of CFRCM is thoroughly viewed. An equivalent telescopic layered failure model of CFRCM was developed, considering the trilinear cohesive material law (CML) and the piezoresistive effect. The model was successfully used to simulate the piezoresistive effect during the loaded process of CFRCM. The number of fiber filaments in each layer, the rupture damage of the fiber filaments during the loading process, and the degree of matrix infiltration into the carbon fibers were quantified. The work lays the foundation for advancing the development of tri-functional system with CFRCM.

Biographical Sketch:

Dr. Zhang has been devoted to the reinforcement, repair and seismic strengthening of reinforced concrete structures, focusing on flexural reinforcement of beams and shear and seismic reinforcement of columns, mainly involving carbon fiber fabric, PET fiber fabric, carbon fiber lattice reinforcement, polymer cement mortar, etc. Dr. Zhang has a strong understanding of new and old materials, as well as a good understanding of new and old materials, as well as a good understanding of new and old materials. Dr. Zhang has done sufficient and systematic research on the interfacial bond strength of new and old materials as well as the performance of reinforced beams and slabs under external loads (static load, fatigue) and environmental effects (freezing, immersion, corrosion), and has derived various effective and reliable reinforcement strength models through experimental and analytical means, and also carried out parametric analyses of different stripping damage modes, so as to optimize the performance of the reinforced structures. performance.