Shielding effectiveness of concrete reinforced with steel fibers: influence of fiber length and aspect ratio
Résumé
We present an experimental assessment of the electromagnetic shielding effectiveness of fiber-reinforced concrete slabs. The following parameters are varied: fiber volume content, fiber length and fiber aspect ratio, and the influence of each one can be observed. The measurements are compared to theoretical predictions by the Maxwell Garnett formula. This formula is known to apply only to low frequencies (quasi-static assumption). Based on our experiments, we propose a formula that defines the validity range of the underlying quasi-static assumption. Finally, we assess over a six month period how the evolution of the concrete matrix affects the shielding effectiveness of the fiber-reinforced concrete slab.
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