PURPOSE: To provide a radiowave-absorptive concrete panel which is spacious and sufficiently strong and in which the volume of ferrite can be easily adjusted.
CONSTITUTION: Slits 6 are provided on a synthetic rubber sheet 4 mixed with ferrite particles 7 at the middle in the thickness direction of a concrete panel reinforced by a reinforcing material 2 and a ferrite rubber mesh 3 in which the synthetic rubber sheet 4 is stretched and spread, is buried in the slit 6. Reinforcing materials in which a plurality of chemical fibrous fine threads having a larger tensile strength are knitted as braids, reinforceing materials in which ferrite particles are stuck to the peripheral face or contained in the inside of the knitted body as braids, reinforcing materials in which fine threads are knitted as braids, at the periphery of a synthetic resin core material containing ferrite particles, or a mesh which is made of long carbon fiber, are used as the reinforcing materials 2. In this way, the volume of ferrite particles in the panel can be easily adjusted.
HASUO KOICHI
MAEDA ETSUKO
