“…Cement is slightly conductive and its absorbing ability is poor, but through introducing electromagnetic fillings or loadings, which can be transformed into functional materials with EMW-absorbing properties [3,4]. There have been many studies on the reflection loss of cement-matrix composite material, in which most of the fillers are large dielectric losses or magnetic losses absorbents, such as carbon [3,5], metal powders [6,7], magnetic ferrites [8][9][10] and their fibers [11][12][13][14]. With these fillers, cement composite materials can reach high reflection losses of -8~-20 dB in the frequency range tested.…”