Effect of nano and micro conductive materials on conductive properties of carbon fiber reinforced concrete

Abstract

<jats:title>Abstract</jats:title><jats:p>In this study, the pressure sensitivity and temperature sensitivity of the diphasic electric conduction concrete were investigated by measuring the resistivity using the four-electrode method. The diphasic electric conduction concrete was obtained by mixing nano and micro conductive materials (carbon nanofibers, nano carbon black and steel slag powder) into the carbon fiber reinforced concrete (CFRC). The results indicated that, with the increase of conduction time, the resistivity of CFRC decreased slightly at the initial stage and then became steady, while the resistivity of CFRC containing nano carbon black had a sharp decrease at the dosage of 0.6%. With the increase of compression load, the coefficient of resistivity variation of CFRC containing nano carbon black and steel slag powder changed little. The coefficient of resistivity variation increased with the increase of steel slag powder in the dry environment, and CFRC had preferable pressure sensitivity when the mass fractions of carbon fiber and carbon nanofiber were 0.4% and 0.6%, respectively. Besides, in the humid environment, the coefficient of resistivity variation decreased with the increase of steel slag powder, and the diphasic electric conduction concrete containing 0.4% carbon fibers and 20% steel slag powder had the best pressure sensitivity under the damp environment. Moreover, in the dry environment, CFRC containing nano and micro conductive materials presented better temperature sensitivity in the heating stage than in the cooling stage no matter carbon nanofiber, nano carbon black or steel slag powder was used, especially for the CFRC containing steel slag powder.</jats:p>

Finite Element of Nanoscale Carbon Fiber-Reinforced Concrete Bridge Engineering Monitoring Based on Data Mining Technology

“…Its shear resistance and seismic performance of the reinforced components are better than those of ordinary steel tube concrete. According to the different types of fibers composed of FRP, fiber composite materials mainly used in engineering can be divided into carbon fiber-reinforced polymer (CFRP), glass fiber-reinforced polymer (GFRP), aramid fiber-reinforced polymer (AFRP) [18]. Table 2 shows their various indicators.…”

Research Progress in Environmental Response of Fiber Concrete and Its Functional Mechanisms

“…Many scholars have studied the intelligent response characteristics of the smart hybrid concrete and found that the intelligent response has a coupling effect [117][118][119][120][121]. It is related to the distribution and contact of the mixed fiber in the concrete and is affected by the type of mixed fibers, and the content and proportion of fibers, ambient temperature, and water content [121][122][123][124][125][126]. Dong et al [13] prepared CB/PP smart concrete.…”

Characterization of carbon fiber reinforced conductive mortars filled with recycled ferrochrome slag aggregates

“…In the literature, it has been reported that CF can inhibit microcrack growth in the study on the compressive strength of CF reinforced concrete [23]. Han et al [24] stated that CF reinforced concrete has excellent compressive strength and high flexural strength compared to conventional concrete. Considering the use of industrial waste materials in concrete production and the studies on conductive concrete, research has been carried out to improve the strength properties of concrete by using recycled ferrochrome instead of aggregate.…”