Ohmic heating (OH) curing method has been proved to cure conductive fibers enhanced cementitious composites by electric-heating conversion under ultralow temperature, and this curing effect depends greatly on the heating efficiency. This paper presents a novel idea of utilizing carbon nanofibers (CNFs) to regulate and control the heating efficiency of carbon fibers (CFs) enhanced cementitious composites. The heating efficiency including peak curing temperature and temperature-increase rate of CF/CNFs reinforced cementitious composite (CF/CNF-CCC) with 0–0.3 vol% CNFs addition are traced. Results show that the increasing addition of CNFs shows a significantly increased enhancement effect to the heating efficiency during OH curing, in which the peak curing temperature and temperature-increase rate are increased from 44.8 °C to 0.139 °C/min to 73.2 °C and 0.39 °C/min as the content of CNFs is increased from 0 to 0.3 vol%. The microstructural heating mechanism based on CNFs distribution type in CF/CNF-CCC samples is clarified, two CNFs “bridge effects” are considered to effectively construct microscopic conductive network of CNFs among macroscopic conductive network of CFs. COMSOL Multiphysics simulation is conducted to further verify the improving effect of CNFs on the heating efficiency and to quantificationally guide the material composition design of CF/CNF-CCC for achieving the controllability of heating efficiency.

欧姆加热（OH）固化方法已被证明可以在超低温下通过电热转化来固化导电纤维增强的水泥基复合材料，这种固化效果在很大程度上取决于加热效率。本文提出了利用碳纳米纤维（CNF）来调节和控制碳纤维（CFs）增强水泥基复合材料的加热效率的新思路。跟踪了添加了0-0.3％（体积）CNFs的CF / CNFs增强水泥基复合材料（CF / CNF-CCC）的加热效率，包括峰值固化温度和升温速率。结果表明，CNFs的增加显示了对OH固化过程中加热效率的显着增强效果，其中峰值固化温度和升温速率从44.8°C升至0.139°C / min升至73。随着CNF含量从0体积％增加到2℃和0.39℃/ min。阐明了CF / CNF-CCC样品中基于CNFs分布类型的微观结构加热机理，考虑了两个CNF的“桥效应”，以在CFs的宏观导电网络中有效地构建CNFs的微观导电网络。进行COMSOL Multiphysics仿真以进一步验证CNF对加热效率的改善效果，并定量指导CF / CNF-CCC的材料成分设计以实现加热效率的可控性。为了在CF的宏观导电网络中有效构造CNF的微观导电网络，考虑了两个CNF的“桥效应”。进行COMSOL Multiphysics仿真以进一步验证CNF对加热效率的改善效果，并定量指导CF / CNF-CCC的材料成分设计以实现加热效率的可控性。为了在CF的宏观导电网络中有效构造CNF的微观导电网络，考虑了两个CNF的“桥效应”。进行COMSOL Multiphysics仿真以进一步验证CNF对加热效率的改善效果，并定量指导CF / CNF-CCC的材料成分设计以实现加热效率的可控性。