Electrical properties of different types of carbon fiber reinforced plastics (CFRPs) and hybrid CFRPs

Nano-carbon black and carbon fiber as conductive materials for the diagnosing of the damage of concrete beam

“…The addition of short CF as an admixture can form a continuous conduction net and reduce the electric resistance, decrease the shrinkage cracking, improve the durability and freezing resistance and does not induce large amount of water demand. The combined use of NCB and short CF into concrete can both show the advantage of the conductive network of CF and make use of electric characteristics of NCB [10][11][12][13][14][15][16][17][18][19][20][21], and also provides the conductive concrete with well mechanical property.…”

“…The damage of the cement-based material may change the electric resistance, as observed for damage in the elastic tension regime, in the plastic deformation region and after cracking of concrete [9,18,19,22]. The strain and damage of carbon fiber reinforced cement specimens under compression, tension or flexural loading have been discussed in previous studies [10,[18][19][20][21]. The investigation on the combined use of NCB and short CF in cement or concrete could be found [10,11].…”

Joule heating of dry textiles made of recycled carbon fibers and PA6 for the series production of thermoplastic composites

“…The top diagram in Figure 9 illustrates that the resistance of the material continues to change after 2 min, while the diagrams in the middle and on the bottom show that the material exhibits a nearly constant behavior after 60 s. The decreasing resistance can be explained by the negative temperature coefficient (NTC) behavior of the carbon fibers and the settlement of all fibers in the dry textile. 20 Tests of the consolidation behavior at different pressure levels prove that a pressure of 22 bar yields the best optically evaluated consolidation for material V3 at the lowest current level. On the y-axis, Figure 10 (left) depicts the mean maximum temperature measured at the tool surface of upper and lower die.…”

Concrete with nanomaterials and fibers for self-monitoring of strain and cracking subjected to flexure

“…Prior work in the combined use of NCB and CF in cement-based materials has been reported (Wen and Chung, 2007;Ding et al, 2013;Chung, 2001). The advantage of the combined use of NCB and CF is the synergistic effect, which refers to the filling (i.e., conductive filler) of the microscopic space between adjacent fibers by NCB, thereby resulting in enhancing the electrical conductivity of composites (Wu, 2005;Cai and Chung, 2006;Yang et al, 2007;Ding, 2011). Some previous studies on the self-sensing concrete are focused on the use of monophasic or diphasic conductive materials, and the relationship between the fractional change in resistance and the tension strain before concrete cracking has been suggested.…”