alertness;  carbon fiber;  concrete;  Model

Carbon fiber cementitious materials with volume content (0.0%, 0.2%, 0.4%, 0.8% and 1.2%) were fabricated, and the test pieces were 100 mm× 100 mm × 100 mm cubes. The conductivity performance was compared, and the relationship between compressive stress and resistivity of concrete with different carbon fiber content under monotonic and cyclic loads was experimentally studied. The results show that with the increase of carbon fiber content, the impedance curve gradually shifts to the left, and the fibers randomly distributed in three-dimensional space gradually aggregate and connect with each other, which greatly increases the conductivity of the composite. When the volume content of carbon fiber is the same as 1.0%, the AC impedance spectrum of materials of different ages varies greatly, and with the increase of hydration age, a large number of C-S-H gels are formed, and the solution resistance in cement-based materials gradually increases.