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Open AccessArticle

Shielding Properties of Cement Composites Filled with Commercial Biochar

Department of Electronics and Telecommunications, Polytechnic of Turin, Duca degli Abruzzi 24, 10129 Torino, Italy
Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine, Italy
Author to whom correspondence should be addressed.
Electronics 2020, 9(5), 819;
Received: 11 May 2020 / Accepted: 14 May 2020 / Published: 16 May 2020
(This article belongs to the Special Issue Electromagnetic Interference and Compatibility)
The partial substitution of non-renewable materials in cementitious composites with eco-friendly materials is promising not only in terms of cost reduction, but also in improving the composites’ shielding properties. The water and carbon content of a commercial lignin-based biochar is analyzed with thermal gravimetric analysis. Cementitious composite samples of lignin-based biochar with 14 wt.% and 18 wt.% are realized. Good dispersion of the filler in the composites is observed by SEM analysis. The samples are fabricated in order to fit in a rectangular waveguide for measurements of the shielding effectiveness in the X-band. A shielding effectiveness of 15 dB was obtained at a frequency of 10 GHz in the case of composites with 18 wt.% biochar. Full-wave simulations are performed by fitting the measured shielding effectiveness to the simulated shielding effectiveness by varying material properties in the simulator. Analysis of the dimensional tolerances and thickness of the samples is performed with the help of full/wave simulations. Lignin-based biochar is a good candidate for partial substitution of cement in cementitious composites, as the shielding effectiveness of the composites increases substantially. View Full-Text
Keywords: shielding effectiveness; biochar; eco-friendly material; cementitious composites; waveguides shielding effectiveness; biochar; eco-friendly material; cementitious composites; waveguides
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MDPI and ACS Style

Yasir, M.; di Summa, D.; Ruscica, G.; Natali Sora, I.; Savi, P. Shielding Properties of Cement Composites Filled with Commercial Biochar. Electronics 2020, 9, 819.

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