A study on the compression sensibility and mechanical model of carbon fiber reinforced cement smart material

Under low compressive stress, carbon fiber reinforced cement (CFRC) exhibits the compressive sensibility for its inner deformation. The curve measured in the course of specimen suddenly loaded by a constant load and unloaded suddenly exhibits the variation of resistivity with time, and the curves measured under cyclic loads exhibits the variation of resistivity with cyclic stresses. Based on the results of experiment, the tunnel conduction effect and the structure of hardened cement paste, a mechanical model for CFRC is proposed and the rules of deformation when the specimen is loaded constantly or cyclically are also inferred. These rules can well explain the mechanism of CFRC' s compressive sensibility.Financed by National Natural Science Foundation of China Key Project No. 59432061.