Piezoresistivity-Based Strain Sensing in Carbon Fiber-Reinforced Cement

The authors argue that when using carbon fiber-reinforced cement (152 mm [6 in.] specimens under compression) in the elastic regime, the four-probe electrical resistance measurement method is more effective than the two-probe method for piezoresistivity-based strain sensing since there is less strain amplitude variation and higher gauge factor (per unit strain, fractional resistance change). Due to minor electrical contact degradation, in the first few loading cycles of the two-probe method there are irreversible increases in resistance. Whether the two- or four-probe method is used, slightly lower resistivity and more effective strain sensing is given by using embedded stainless steel electrical contacts than surface silver paint electrical contacts. Embedded steel contact use in the four-probe method resulted in resistance with strain having lower noise variation and greater linearity when compared to surface silver paint contacts. Embedded steel contact use in the two-probe method resulted in smaller fractional contact resistance contribution to the measured resistance and lower gauge factor variability than with surface silver paint contact use.

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  • English

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  • Accession Number: 01049930
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 3 2007 7:13PM