Electromagnetic Wave Absorption Properties and Mechanical Properties of Aramid Fiber Reinforced Cement

Abstract

To solve more and more serious electromagnetic radiations, cement-based composites were prepared by introducing aramid fiber into cement. The reflection losses were studied using arched testing method in the frequency range of 1.7~18 GHz. The results showed that the absorption properties and mechanical properties were all improved preferably. The mechanisms were discussed, which indicated that the space network structure lapped into mutually by aramid fiber played an important role. The filling ratio of aramid fiber as well as the length of fiber had influence on the absorption properties, the breaking strength and the compressive strength of cement. The lowest reflection loss of -12.2 dB was obtained at 18 GHz, the effective absorption bandwidth (less than -8 dB) reached 9.15 GHz ,and the compressive strength was twice than that of cement paste when the specimen was filled with 8 vol. % aramid fiber with length of 3mm.