This paper aimed to study the electrical and mechanical performances of carbon nanofibers (CNFs) mortar. In this research, quartz sand was used as aggregate. The dosage of CNFs ranged from 0 to 2.4% by volume of cement, and water–cement (w/c) ratio in this study was 0.35. Electrical resistance of CNFs mortar was tested with curing time from 1 to 28 days. In addition, the flexural strength, the compressive strength and the piezoresistivity of CNFs mortar with monotonic compressive loading and cyclic compressive loading after curing for 28 days were determined. Results indicated that CNFs volume (V) of 0.3–1.8% was the percolation zone of CNFs mortar with quartz sand. When CNFs volume was in the percolation zone, the resistance decreased obviously; meanwhile, the resistivity of CNFs mortar was in a linear function of V−1/3. Moreover, the resistance of CNFs mortar with CNFs dosages of 0–1.8% tended to increase with curing time. While, as CNFs content ranged from 1.8 to 2.4%, the resistance had little change with curing time. When CNFs contents were 0.6% and 1.2%, respectively, the samples performed the optimal mechanical strengths and piezoresistive property. CNFs mortar with quartz sand presented more sensitive than CNFs mortar with river sand under monotonic compressive loading and cyclic compressive loading.

中文翻译：

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含石英砂的碳纳米纤维砂浆力学和导电性能研究

本文旨在研究碳纳米纤维（CNFs）砂浆的电气和机械性能。在这项研究中，石英砂被用作骨料。CNF 的用量为水泥体积的 0% 到 2.4%，本研究中的水灰比 (w/c) 为 0.35。CNFs 砂浆的电阻测试了 1 到 28 天的固化时间。此外，还测定了CNFs砂浆在单调压缩加载和循环压缩加载下固化28天后的抗弯强度、抗压强度和压阻率。结果表明，CNFs 体积 (V) 为 0.3-1.8% 是 CNFs 砂浆与石英砂的渗透区。当CNFs体积在渗流区时，阻力明显下降；同时，CNFs 砂浆的电阻率呈 V-1/3 的线性函数。而且，CNFs 用量为 0-1.8% 时，CNFs 砂浆的抗性随着养护时间的增加而增加。同时，由于 CNFs 的含量范围为 1.8% 到 2.4%，电阻随固化时间几乎没有变化。当 CNFs 含量分别为 0.6% 和 1.2% 时，样品表现出最佳的机械强度和压阻性能。在单调压缩载荷和循环压缩载荷下，石英砂CNFs砂浆比河砂CNFs砂浆更敏感。