Physical-Mechanical and Electrical Resistivity Properties of Cementitious Mortars Containing Fe 3 O 4 -MWCNTs Nanocomposite

Veyis Selen, Omer Guler, Mehrab Nodehi, Ahmet Sarı, Ali Yaras, Osman Gencel (), Aliakbar Gholampour and Togay Ozbakkaloglu ()
Additional contact information
Veyis Selen: Department of Bioengineering, Firat University, 23119 Elazig, Turkey
Omer Guler: Rare Earth Elements Application and Research Center, Munzur University, 62000 Tunceli, Turkey
Mehrab Nodehi: Department of Civil Engineering, University of California, Davis, CA 95616, USA
Ahmet Sarı: Department of Metallurgical and Material Engineering, Karadeniz Technical University, 61080 Trabzon, Turkey
Ali Yaras: Department of Metallurgical and Materials Engineering, Faculty of Engineering, Architecture and Design, Bartin University, 74110 Bartin, Turkey
Osman Gencel: Civil Engineering Department, Faculty of Engineering, Architecture and Design, Bartin University, 74100 Bartin, Turkey
Aliakbar Gholampour: College of Science and Engineering, Flinders University, Adelaide, SA 5042, Australia
Togay Ozbakkaloglu: Ingram School of Engineering, Texas State University, San Marcos, TX 78666, USA

Sustainability, 2023, vol. 15, issue 14, 1-21

Abstract: Recent growth in materials science and engineering technologies has pushed the construction industry to engage in new applications, such as the manufacturing of smart and electrically conductive products. Such novel uses of conductive construction materials would potentially allow their use in conjunction with various fields, such as those referred to as “Industry 4.0.” The following study uses iron oxide (Fe 3 O 4 )-multi-walled carbon nanotubes (MWCNTs) nanocomposites synthesized by chemical vapor deposition (CVD) and incorporated into the cementitious mortars as a substitute for sand at 1, 2, and 3% ratios to enhance the electrical conductivity. Results reveal that the electrical resistivity of cementitious composites decreases (due to the increase in electrical conductivity) from 208.3 to 61.6 Ω·m with both the Fe 3 O 4 -MWCNTs nanocomposites ratio and the increasing voltage. The lowest compressive strengths at 7 and 28 days are 12.6 and 17.4 MPa for specimens with 3% Fe 3 O 4 -MWCNTs and meet the standards that comply with most applications. On the other hand, the highest porosity was reached at 26.8% with a Fe 3 O 4 -MWCNTs rate of 3%. This increase in porosity caused a decrease in both the dry unit weight and ultrasonic pulse velocity (from 5156 to 4361 m/s). Further, it is found that the incorporation of Fe 3 O 4 -MWCNT nanocomposites can have a negative effect on the hardening process of mortars, leading to localized air cavities and an inhomogeneous development of cementing products. Nonetheless, the improvement of the electrical conductivity of the samples without significantly compromising their physico-mechanical properties will allow their use in various fields, such as deicing applications with low-voltage electric current.

Keywords: electrically conductive mortars; chemical vapor deposition (CVD); multi-walled carbon nanotubes (MWCNTs); iron oxide (Fe 3 O 4 ); characterization (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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