| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a RFID tag which can be used by attaching to a surface layer part of a concrete test piece, the concrete test piece, and an RFID system for concrete quality management. <P>SOLUTION: This RFID tag comprises an antenna coil 2a formed by etching a copper foil or the like on an insulating film or arranging a copper wire thereon, in which the resonance frequency of a resonance circuit is preliminarily set high. The tag further comprises holes 2c provided on the antenna coil inside area of the insulating film, or a porous member 9 arranged on at least a concrete mounting surface side. This tag is set on the surface layer part of the upper surface, lower surface or side surfaces of the concrete test piece. According to this, the tag 2 can be firmly fixed to the surface of the concrete test piece 5 by penetrating concrete 5a into the holes 2c or the pores 9a of the porous member, the influence of concrete absorbing and attenuating radio waves can be suppressed, and a reduction in communication distance can be prevented by obtaining a desired resonance frequency in the state where the concrete test piece 5 is cured. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
