Effects of single-walled carbon nanotubes and steel fiber on recycled ferrochrome filled electrical conductive mortars

Abstract

The production of electrically conductive concrete was introduced years ago among construction materials, generally for anti-icing. The present study investigates the electrical, mechanical, dynamic, and microstructural properties of recycled ferrochrome filled cementitious mortars, containing single-walled carbon nanotubes (SWCNTs) and steel fiber. 7, 14, and 28-day non-destructive and 28-day compressive and bending tests of cementitious conductive mortars obtained from five different mixtures were performed. Two-point uniaxial method was used to determine the electrical conductivity properties of the samples. The damping ratio of the samples was obtained by performing dynamic resonance tests. Ultrasound pulse velocity (UPV) and Leeb hardness tests were performed as other non-destructive testing methods. Microstructure analysis at the interfaces of conductive concrete samples were characterized by scanning electron microscopy (SEM), EDS (Energy-Dispersive X-ray Spectroscopy), and X-ray diffraction (XRD). According to the experimental results, all data agreed and confirmed each other. When SWCNT is used in combination with steel fiber, the conductive mortar samples exhibited reasonable conductivity, while their mechanical properties turned out to below.

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

“…Furthermore, in studies the performance of concretes containing CNT and fiber, it has been stated that the compressive strength of CNT/steel fiber reinforced concrete is higher than only CNT reinforced concrete [26,27]. 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.…”

Pilot Tests of Pre-Reduction in Chromium Raw Materials from Donskoy Ore Mining and Processing Plant and Melting of High-Carbon Ferrochromium

“…It has been observed that the utilization of a metalized product, derived from enriching metal concentrates in slag and varying in quality within the charge of the ore-smelting furnace, results in decreased specific energy consumption for melting ferroalloys, alongside an increased furnace capacity. Consequently, the introduction of partially or fully reduced material into the ore-smelting furnace for remelting purposes will reduce specific energy consumption for ferrochromium melting and enhance its capacity [3][4][5][6][7][8][9][10][11][12][13].…”