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Abstract
Abstract In this study, the pressure sensitivity and temperature sensitivity of the diphasic electric conduction concrete were investigated by measuring the resistivity using the four-electrode method. The diphasic electric conduction concrete was obtained by mixing nano and micro conductive materials (carbon nanofibers, nano carbon black and steel slag powder) into the carbon fiber reinforced concrete (CFRC). The results indicated that, with the increase of conduction time, the resistivity of CFRC decreased slightly at the initial stage and then became steady, while the resistivity of CFRC containing nano carbon black had a sharp decrease at the dosage of 0.6%. With the increase of compression load, the coefficient of resistivity variation of CFRC containing nano carbon black and steel slag powder changed little. The coefficient of resistivity variation increased with the increase of steel slag powder in the dry environment, and CFRC had preferable pressure sensitivity when the mass fractions of carbon fiber and carbon nanofiber were 0.4% and 0.6%, respectively. Besides, in the humid environment, the coefficient of resistivity variation decreased with the increase of steel slag powder, and the diphasic electric conduction concrete containing 0.4% carbon fibers and 20% steel slag powder had the best pressure sensitivity under the damp environment. Moreover, in the dry environment, CFRC containing nano and micro conductive materials presented better temperature sensitivity in the heating stage than in the cooling stage no matter carbon nanofiber, nano carbon black or steel slag powder was used, especially for the CFRC containing steel slag powder.
Highlights
The traditional cement-based materials have many disadvantages due to large shrinkage during cement hydration and low durability [1,2,3,4]
The testing results of the temperature sensitivity of the Carbon fiber reinforced concrete (CFRC) containing steel slag powder can be analyzed by the method of least squares to obtain the curves of relationship between temperature (x) and coefficient of resistivity variation (y)
The number of the internal carriers inside CFRC changes with the change of temperature
Summary
The traditional cement-based materials have many disadvantages due to large shrinkage during cement hydration and low durability [1,2,3,4]. The commonly used fibers are carbon fibers, steel fibers, polypropylene fibers, polyvinyl alcohol fibers and so on [5,6,7,8,9]. Among these fibers, carbon fibers are more suitable than the other fibers in respect of finishability, weatherability, mixability, thermal resistance and long-term chemical stability in unstable environments [10]. CFRC possesses excellent compressive strength, and on the other hand, it has better fracture toughness and higher flexural strength than traditional concretes [15,16]
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