Electromagnetic interference shielding with Portland cement paste containing carbon materials and processed fly ash

Authors

  • E. Zornoza Universidad de Alicante
  • G. Catalá Universidad de Alicante
  • F. Jiménez Universidad Politécnica de Madrid
  • L. Gª Andión Universidad de Alicante
  • P. Garcés Universidad de Alicante

DOI:

https://doi.org/10.3989/mc.2010.51009

Keywords:

EMI shielding, cement paste, processed fly ash, carbon fibre, graphite powder

Abstract


The study described in this article explored the effect of adding different types of carbon materials (graphite powder and three types of carbon fibre), fly ash (with 5.6%, 15.9% and 24.3% Fe2O3), and a mix of both on electromagnetic interference (EMI) shielding in Portland cement pastes. The parameters studied included the type and aspect ratio of the carbonic material, composite material thickness, the frequency of the incident electromagnetic radiation and the percentage of the magnetic fraction in the fly ash. The findings showed that the polyacrylonitrile-based carbon fibres, which had the highest aspect ratio, provided more effective shielding than any of the other carbon materials studied. Shielding was more effective in thicker specimens and at higher radiation frequencies. Raising the magnetic fraction of the fly ash, in turn, also enhanced paste shielding performance. Finally, adding both carbon fibre and fly ash to the paste resulted in the most effective EMI shielding as a result of the synergies generated.

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References

(1) Chung, D. D. L.: “Functional Properties of Cement-Matrix Composites”, J. Mater. Sci. 36 (2001), pp. 1315-1324. doi:10.1023/A:1017522616006

(2) Chung, D. D. L.: “Materials for Electromagnetic Interference Shielding”, J. Mater. Eng. Perf. 9(3) (2000), pp. 350-354. doi:10.1361/105994900770346042

(3) Chung, D. D. L.: “Carbon fiber cement-matrix composites”, Tanso, nº 190, (1999), pp. 300-312.

(4) Wu, Junhua; Chung, D. D. L.: “Pastes for electromagnetic interference shielding”, Journal of Electronic Materials, vol. 34, nº 9 (2005).

(5) Kovalchuk, G.; Fernández-Jiménez, A.; Palomo, A.: “Alkali-activated fly ash. Relationship between mechanical strength gains and initial ash chemistry”, Materiales de Construcción, 58: 291 (2008), pp. 35-52.

(6) Menéndez, G.; Bonavetti, V. L.; Irassar, E. F.: “Ternary blended cement concrete. Part I: early age properties and mechanical strength”, Materiales de Construcción, 56: 284 (2006), pp. 55-67.

(7) Goñi, S.; Guerrero, A.: “Hydraulic activity of belite cement from class C coal fly ash. Effect of curing and admixtures”, Materiales de Construcción, 56: 283 (2006), pp. 61-77.

(8) Fernández-Jiménez, A.; Palomo, A.: “Factors affecting early compressive strength of alkali activated fly ash (OPC-free) concrete”, Materiales de Construcción, 57: 287 (2007), pp. 7-22.

(9) Cao, Jingyao; Chung, D. D. L.: “Use of fly ash as an admixture for electromagnetic interference shielding”, Cement and Concrete Research, 34 (2004), pp. 1889-1892. doi:10.1016/j.cemconres.2004.02.003 doi:10.1016/j.cemconres.2004.02.003

(10) Garcés, P.; Andión, L.G.; Zornoza, E.; Bonilla, M.; Payá, J. “The effect of processed fly ashes on the durability and the corrosion of steel rebars embedded in cement-modified fly ash mortars”. Cement and Concrete Composites 32:3 (2010) 204-210. doi:10.1016/j.cemconcomp.2009.11.006

(11) Fu, Xuli and Chung, D. D. L.: “Submicron carbon filament cement-matrix composites for electromagnetic interference shielding”, Cement and Concrete Research, vol. 26, nº 10, pp. 1467-1472, 1996.

(12) Fu, Xuli; Chung, D. D. L.: “Radio-wave-reflecting concrete for lateral guidance in automatic highways”, Cement and Concrete Research, vol. 28, nº 6 (1998), pp. 795-801. doi:10.1016/S0008-8846(98)00057-X

(13) Wen, Sihai; Chung, D. D. L.: “Electromagnetic interference shielding reaching 70 dB in steel fiber cement”, Cement and Concrete Research, 34 (2004), pp. 329-332. doi:10.1016/j.cemconres.2003.08.014

(14) Chen, P.-W.; Chung, D. D. L.: “Improving the Electrical Conductivity of Composites Comprised of Short Conducting Fibers in a Non- Conducting Matrix: the Addition of a Non-Conducting Particulate Filler”, J. Electron. Mater. 24 (1) (1995), pp. 47-51.6

(15) Cao, J.; Chung, D. D. L.: “Colloidal graphite as an admixture in cement and as a coating on cement for electromagnetic interference shielding”, Cement and Concrete Research, 33 (2003), pp. 1737-1740. doi:10.1016/S0008-8846(03)00152-2

(16) Cao, J.; Chung, D. D. L.: “Coke powder as an admixture in cement for electromagnetic interference shielding”, Carbon 41 (2003), pp. 2427-2451. doi:10.1016/S0008-6223(03)00289-6

(17) Chiou, J.-M.; Zheng, Q.; Chung, D. D. L.: “Electromagnetic interference shielding by carbon fibre reinforced cement”, Composites, 20 (1989), pp. 379-381. doi:10.1016/0010-4361(89)90663-0

(18) Chung, D. D. L.: “Electromagnetic interference shielding effectiveness of carbon materials”, Carbon 39 (2001), pp. 279-285. doi:10.1016/S0008-6223(00)00184-6

(19) Payá, J.; Borrachero, M. V.; Monzó, J.; Peris-Mora, E.; Bonilla, M.: “Long term mechanical strength behaviour in fly ash/Portland cement mortars prepared using processed ashes”, Journal of Chemical Technology and Biotechnology, 77 (2002), pp. 336-344. doi:10.1002/jctb.580

(20) Guan, H.; Liu, S.; Duan, Y.; Cheng, J.: “Cement based electromagnetic shielding and absorbing building materials”, Cement & Concrete Composites, 28 (2006), pp. 468-474. doi:10.1016/j.cemconcomp.2005.12.004

(21) Guan, H.; Liu, S.; Duan, Y.; Zhao, Y.: “Investigation of the electromagnectic characteristics of cement based composites filled with EPS”, Cement & Concrete Composites, 29 (2007), pp. 49-54. doi:10.1016/j.cemconcomp.2006.08.001

(22) Akkurt, I.; Basyigit, C.; Kilincarslan, S.; Mavi, B.; Akkurt, A.: “Radiation shielding of concretes containing different aggregates”, Cement & Concrete Composites, 28 (2006), pp. 153-157. doi:10.1016/j.cemconcomp.2005.09.006

(23) Wen, S.; Chung, D. D. L.: “Partial replacement of carbon fiber by carbon black in multifunctional cement-matrix composites”, Carbon 45 (2007), pp. 505-513. doi:10.1016/j.carbon.2006.10.024

(24) Chung, D. D. L.: “Electrically conductive cement-based materials”, Advances in Cement Research, 16 (2004), pp. 167-176. doi:10.1680/adcr.2004.16.4.167

(25) Shi, Z.-Q.; Chung, D. D. L.: “Concrete for magnetic shielding”, Cement and Concrete Research, 25:5 (1995), pp. 939-944. doi:10.1016/0008-8846(95)00087-S

(26) Wang, C.; Li, K.; Li, H.; Guo, L.; Jiao, G.: “Influence of CVI treatment of carbon fibers on the electromagnetic interference of CFRC composites”, Cement & Concrete Composites, 30 (2008), pp. 478-485. doi:10.1016/j.cemconcomp.2007.09.002

(27) Li, K.; Wang, C.; Li, H.; X. Li; Ouyang, H.: “Effect of chemical vapor deposition treatment of carbon fibers on the reflectivity of carbon fiber-reinforced cement-based composites”, Composite Science & Technology, 68 (2008), pp. 1105-1114. doi:10.1016/j.compscitech.2007.08.003

(28) Bhattacharya, S.; Sachdev, V. K.; Chatterjee, R.; Tandon, R. P.: “Decisive properties of graphite-filled cement composites for device application”, Applied Physics A, 92 (2008), pp. 417-420. doi:10.1007/s00339-008-4544-9

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Published

2010-12-30

How to Cite

Zornoza, E., Catalá, G., Jiménez, F., Andión, L. G., & Garcés, P. (2010). Electromagnetic interference shielding with Portland cement paste containing carbon materials and processed fly ash. Materiales De Construcción, 60(300), 21–32. https://doi.org/10.3989/mc.2010.51009

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Research Articles

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