Ceramsite containing iron oxide and its use as functional aggregate in microwave absorbing cement-based materials

Abstract

Electromagnetic (EM) wave absorbing cement-based composite has promising applications in protecting civil and military buildings from electromagnetic interferences. A new idea of preparing EM wave absorbing cement-based composite is proposed by using ceramsite containing iron oxide as EM wave absorbing functional aggregate. The ceramsite was synthesized by adding 10 wt% Fe₃O₄ into clay and sintering at 1 200 °C, which shows obvious dielectric and magnetic loss properties for electromagnetic wave. The maximum reflection loss (RL) of the concrete specimens prepared with the ceramsite is between -10.2—10.7 dB (corresponding to absorption greater than 90% EM energy) in the bandwidth of 8-18 GHz. In addition, the compressive strength at 28 days age of the concrete is 46 MPa, showing the potentiality of being used as structural components in buildings.

Keywords

electromagnetic absorption / iron oxide / ceramsite / functional aggregate / concrete

References

[1] Thomassin J M, Jérôme C, Pardoen T, et al. Polymer/Carbon Based Composites as Electromagnetic Interference (EMI) Shielding Materials[J]. Mat. Sci. Eng. R, 2013, 74: 211-232.

[2] Liu X, Pan S K, Cheng L C, et al. Microwave Absorbing Performance of RE-Fe Based Alloys[J]. J. Wuhan Univ. Technol. -Mater. Sci. Ed., 2015, 30(3): 607-610.

[3] Chen Z, Xu C, Ma C, et al. Lightweight and Flexible Graphene Foam Composites for High-performance Electromagnetic Interference Shielding[J]. Adv. Mater., 2013, 25: 1296-1300.

[4] Wen B, Cao M, Lu M, et al. Reduced Graphene Oxides: Light-weight and High-efficiency Electromagnetic Interference Shielding at Elevated Temperatures[J]. Adv. Mater., 2014, 26: 3484-3489.

[5] Chen W, Wang J, Wang T, et al. Electromagnetic Interference Shielding Properties of Electroless Nickel-coated Carbon Fiber Paper Reinforced Epoxy Composites[J]. J. Wuhan Univ. Technol. -Mater. Sci. Ed., 2014, 29(6): 1165-1169.

[6] Vizi G N, Vandenbosch G A E. Building Materials and Electromagnetic Radiation:The Role of Material and Shape[J]. J. Build. Eng., 2016, 5: 96-103.

[7] Guan H T, Liu S H, Duan Y P, et al. Cement Based Electromagnetic Shielding and Absorbing Building Materials[J]. Cem. Concr. Compos., 2006, 28: 468-474.

[8] Bantsis G, Mavridou S, Sikalidis C, et al. Comparsion of Low Cost Shielding-absorbing Cement Paste Building Materials in X-band Frequency Range Using a Variety of Wastes[J]. Ceram. Int., 2012, 38: 3683-3692.

[9] Hutagalung S D, Sahrol N H, Ahmad Z A, et al. Effect of MnO2 Additive on the Dielectric and Electromagnetic Interference Shielding Properties of Sintered Cement-based Ceramics[J]. Ceram. Int., 2012, 38: 671-678.

[10] Zhang X, Sun W. Microwave Absorbing Properties of Double-layer Cementitious Composites Containing Mn-Zn Ferrite[J]. Cem. Concr. Compos., 2010, 32: 726-730.

[11] Micheli D, Pastore R, Vricella A, et al. Electromagnetic Characterization and Shielding Effectiveness of Concrete Composite Reinforced with Carbon Nanotubes in the Mobile Phones Frequency Band[J]. Mat. Sci. Eng. B, 2014, 188: 119-129.

[12] Khushnood R A, Ahmad S, Savi P, et al. Improvement in Electromagnetic Interference Shielding Effectiveness of Cement Composites Using Carbonaceous Nano/micro Inerts[J]. Constr. Build. Mater., 2015, 85: 208-216.

[13] Micheli D, Pastore R, Apollo C, et al. Broadband Electromagnetic Absorbers Using Carbon Nanostructure-based Composites[J]. IEEE T Microw. Theory, 2011, 59: 2633-2646.

[14] Nam I W, Lee H K. Synergistic Effect of MWNT/Fly Ash Incorporation on the EMI Shielding/Absorbing Characteristics of Cementitious Materials[J]. Constr. Build. Mater., 2016, 115: 651-661.

[15] Han B, Sun S, Ding S, et al. Review of Nanocarbon-engineered Multifunctional Cementitious Composites[J]. Composites A, 2015, 70: 69-81.

[16] Lu B, Dong X L, Huang H, et al. Microwave Absorption Properties of the Core/Shell-type Iron and Nickel Nanoparticles[J]. J. Magn. Magn. Mater., 2008, 320: 1106-1111.

[17] Cornel R M, Schwertmann U. The Iron Oxides: Structure, Properties, Reactions and Uses[M]. 1996 Weinheim: Wiley-VCH.

[18] Zboril R, Mashlan M, Petridis D. Iron(III) Oxides from Thermal Processes-synthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications[J]. Chem. Mater., 2002, 14: 969-982.

[19] Tang B, Wang G, Zhuo L, et al. Facile Route to a-FeOOH and a-Fe₂O₃ Nanorods and Magnetic Property of a-Fe₂O₃ Nanorods[J]. Inorg. Chem., 2006, 45: 5196-5200.

[20] Zhang H, Xie A, Wang C, et al. Novel rGO/-Fe₂O₃ Composite Hydrogel: Synthesis, Characterization and High Performance of Electromagnetic Wave Absorption[J]. J. Mater. Chem. A, 2013, 30: 8547-8552.

[21] Lu L N, He Y J, Ping B, et al. TiO₂ Containing Electromagnetic Wave Absorbing Aggregate and its Application in Concrete[J]. Constr. Build. Mater., 2017, 134: 602-609.