This study investigates the influence of steel slag (SS) and steel fibers on the electrical resistivity and electromagnetic (EM) shielding effectiveness of high-strength concrete (HSC). It was found that the electrical resistivity of mixtures were mainly influenced by free water. Thus, the EM shielding effectiveness was evaluated without the effect of free water. HSC with 20% replacement ratio of SS exhibited slightly improved EM shielding, lower electrical resistivity, and reduced strength (compressive and flexural) compared to HSC without SS. However, HSC with steel fibers exhibited significantly improved EM shielding, lower electrical resistivity, and higher strength and toughness compared to HSC without steel fibers. An increase in the steel fiber content in the HSC significantly decreased the electrical resistivity and increased the shielding effectiveness, strength, and toughness. Regardless of the fiber content in the fiber volume fraction of mixture, the shielding effectiveness is similar for cases with and without SS whose electrical resistivity values differ only slightly. This proves that the EM shielding effectiveness was mainly affected by the electrical resistivity and these properties are significantly correlated when the electrical resistivity values differ noticeably. HSC reinforced with rebar with 50 mm spacing exhibited a 23.5–75.6% increase in the shielding effectiveness in the 600–1,000 MHz frequency region compared to pristine HSC.

本研究调查了钢渣（SS）和钢纤维对高强度混凝土（HSC）的电阻率和电磁（EM）屏蔽效果的影响。发现混合物的电阻率主要受游离水的影响。因此，在没有游离水影响的情况下评估了EM屏蔽效果。与没有SS的HSC相比，具有20％SS置换率的HSC表现出略微改善的EM屏蔽，较低的电阻率和降低的强度（抗压和抗弯）。但是，与不带钢纤维的HSC相比，带钢纤维的HSC表现出显着改善的EM屏蔽，更低的电阻率以及更高的强度和韧性。HSC中钢纤维含量的增加显着降低了电阻率，并提高了屏蔽效果，强度和韧性。无论混合物中纤维体积分数中的纤维含量如何，对于带有和不带有SS的情况，其屏蔽效率都是相似的，SS的电阻率值仅略有不同。这证明了EM屏蔽效果主要受电阻率影响，并且当电阻率值明显不同时，这些性质显着相关。与原始HSC相比，以50 mm间距的钢筋加固的HSC在600-1,000 MHz频率范围内的屏蔽效率提高了23.5-75.6％。对于有和没有SS的情况，其屏蔽效率是相似的，它们的电阻率值仅略有不同。这证明了EM屏蔽效果主要受电阻率影响，并且当电阻率值明显不同时，这些性质显着相关。与原始HSC相比，以50 mm间距的钢筋加固的HSC在600-1,000 MHz频率范围内的屏蔽效率提高了23.5-75.6％。对于有和没有SS的情况，其屏蔽效率是相似的，它们的电阻率值仅略有不同。这证明了EM屏蔽效果主要受电阻率影响，并且当电阻率值明显不同时，这些性质显着相关。与原始HSC相比，以50 mm间距的钢筋加固的HSC在600-1,000 MHz频率范围内的屏蔽效率提高了23.5-75.6％。