Research on the Mechanical and Conductive Properties of Carbon Nanofiber Mortar with Quartz Sand
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RESEARCH PAPER
Research on the Mechanical and Conductive Properties of Carbon Nanofiber Mortar with Quartz Sand Hui Wang1 · Jiale Shen1 · Junzhe Liu1 · Yunlong Yao1 · Minggan Yin1,2 · Ping Zhuge1 Received: 31 October 2018 / Accepted: 15 July 2019 © Shiraz University 2019
Abstract 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. Keywords Quartz sand · Carbon nanofibers · Electrical performance · Mechanical performance · Piezoresistivity
1 Introduction Concrete is a kind of normal construction building material that has been widely used for many years. In order to provide a real-time data of degeneration of large concrete structure in the life cycle, the intrinsic self-sensing concrete comes into being (Huang et al. 2018; Kim et al. 2014). The intrinsic self-sensing concrete is fabricated by adding some conductive fillers such as carbonic fillers and metal fillers. These conductive fillers can improve the conductivity of concrete. The conductivity of concrete is extremely significant for various functional applications such as health monitoring, electrothermal effect, cathodic protection and electromagnetic shielding performance. In recent years, nano-functional * Junzhe Liu [email protected] * Minggan Yin [email protected] 1
Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315000, China
School of Civil Engineering, Yancheng Institute of Technology, Yancheng, China
2
cement-based materials have become hot research topics that attract the interest of many researchers (Liu et al. 2019; Tan et al. 2018; Wang et al. 2018a, b; Konsta-Gdoutos and Aza 2014; Shimoda et al. 2010; Ardanuy et al. 2011). Conductive or semiconductive fillers are most important for making functional cement-based materials. Carbon na
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