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

Abstract

Recently, it has been known that carbon fiber, a conductive fiber, is used in different mixture designs and the development of electrically conductive cementitious materials. However, the evaluation of ferrochrome slag as a recycled aggregate in the mixture of these special concretes has still not been investigated. In this study, electrically conductive mortars were produced using 100% recycled ferrochrome slag aggregate with a particle size of less than 1 mm as filling material and using carbon fiber in 4 different ratios, 0%, 0.5%, 0.75%, and 1%. To investigate the electrical conductivity properties, the resistivity values of the samples were measured at five different times within 2–180 days. In addition, 28-day compressive strength, flexural strength, dynamic resonance, ultrasonic pulse velocity, Leeb hardness, scanning electron microscope, and X-Ray Diffraction tests were performed on all samples. The results were compared with the literature, proving that ferrochrome slag could be used as a reasonable aggregate in conductive mortars. The age effect was minimal in CF-added mixtures. With the addition of 1% CF, the resistivity values decreased approximately 40 times compared to the reference. Moreover, SEM analyses of the CF-0.75 sample showed that the CFs adhered to form a conductive network between the components in the ferrochrome-filled compact structure.

Experimental investigation of engineering properties of silica sand filled mortars containing high doses of SWCNT

“…In the previous study, the resistivity of ferrochrome filled conductive mortars containing SWCNT-SF decreased to 1000 Ω.cm [28]. In addition, the resistivity of CF reinforced ferrochrome filled conductive mortars has been reported up to 200 Ω.cm [29].…”

“…Silica sand was used as the fine aggregate material in the all mixtures. In the literature, there are studies on electrically conductive cementitious materials produced with silica aggregate [28,29]. CEM II-42.5 R white cement, which is preferred in facade cladding, was used as binder.…”