Hao Yali, Shi Cheng, Bi Zhenxiao, Lai Ziqiang, She Anming, Yao Wu
School of Materials Science and Engineering, Tongji University, Shanghai 201804, China.
Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai 201804, China.
Materials (Basel). 2023 Mar 23;16(7):2552. doi: 10.3390/ma16072552.
Under the strategies of low-carbon and environmental protection, promoting green technology innovation to achieve carbon neutrality in the construction field has become a universal goal. As the building material with the highest consumption, concrete has gradually begun to transform into a multi-functional and intelligent product. Therefore, the research on carbon fiber-reinforced cement-based composites (CFRCs) is of relative interest. It mainly uses carbon fibers (CFs) with high elasticity, strength, and conductivity to disperse evenly into the concrete as a functional filler, to achieve the intelligent integration of concrete structures and function innovatively. Furthermore, the electrical conductivity of CFRC is not only related to the content of CFs and environmental factors but also largely depends on the uniform dispersion and the interfacial bonding strength of CFs in cement paste. This work systematically presents a review of the current research status of the enhancement and modification mechanism of CFRC and the evaluation methods of CF dispersion. Moreover, it further discusses the improvement effects of different strengthening mechanisms on the mechanical properties, durability, and smart properties (thermoelectric effect, electrothermal effect, strain-sensitive effect) of CFRC, as well as the application feasibility of CFRC in structural real-time health monitoring, thermal energy harvesting, intelligent deformation adjustment, and other fields. Furthermore, this paper summarizes the problems and challenges faced in the efficient and large-scale applications of CFRCs in civil engineering structures, and accordingly promotes some proposals for future research.
在低碳环保战略下，推动绿色技术创新以实现建筑领域的碳中和已成为普遍目标。作为消耗量最大的建筑材料，混凝土已逐渐开始向多功能智能化产品转变。因此，对碳纤维增强水泥基复合材料（CFRC）的研究备受关注。它主要是将具有高弹性、高强度和高导电性的碳纤维（CF）作为功能性填料均匀分散到混凝土中，创新性地实现混凝土结构与功能的智能融合。此外，CFRC的导电性不仅与CF的含量和环境因素有关，还在很大程度上取决于CF在水泥浆体中的均匀分散程度和界面粘结强度。本文系统地综述了CFRC增强改性机理及CF分散性评价方法的研究现状。此外，还进一步探讨了不同增强机理对CFRC力学性能、耐久性和智能性能（热电效应、电热效应、应变敏感效应）的改善效果，以及CFRC在结构实时健康监测、热能收集、智能变形调节等领域的应用可行性。此外，本文总结了CFRC在土木工程结构中高效大规模应用面临的问题与挑战，并据此提出了一些未来研究的建议。
