2025 Volume 78 Issue 1 Pages 331-338
Cementitious materials have low tensile strength and are often reinforced internally with steel bars. However, since it is sometimes difficult or impossible to insert reinforcing bars into cementitious materials, the use of steel fibers as a reinforcing material is being considered.Since steel fibers have electromagnetic shielding properties, there is concern that they may interfere with electromagnetic communications when steel fiber-blended cementitious materials are used in buildings. On the other hand, there is a possibility that steel fiber-reinforced cementitious materials can be used as electromagnetic shielding materials to control electromagnetic interference in buildings.In this study, it was clarified that the effects of the amount and shape of steel fibers in mortar mixed with steel fibers on the electromagnetic shielding properties and confirmed its reinforcing effect.Within the scope of the study, it was clarified that the mortar can block electromagnetic waves and inhibit electromagnetic communication by incorporating steel fibers, and that sufficient performance as a electromagnetic shielding material can be obtained with the amount of steel fibers incorporated within the range where the reinforcing effect is enhanced. And it was found that the electromagnetic shielding performance tends to increase with the amount of steel fibers blended and with the increase in the aspect ratio of the steel fibers.
