فهرست نشریات علمی دسترسی آزاد ایران

Intelligent cementitious materials hold significant potential for monitoring the structural conditions of mortar. Integrating conductive fillers into these formulations helps achieve this goal. This paper examines the mechanical properties and self-sensing capabilities of M45-type mortars infused with hybrid fillers, specifically activated carbon (AC) and carbon fiber cut from carbon fiber cord (CFC). The innovative mixtures were developed with various hybrid concentrations (AC wt.%, CFC vol.%): (0.67, 1), (1.33, 0.67), and (2, 0.33) %, respectively. These mixtures underwent monotonic and cyclic flexural loading tests for prism samples and direct tensile tests for dog bone specimens. The results demonstrated a high sensitivity to the concentration of hybrid fillers within the matrix. The mixture designated as AC0.67CFC1 emerged as the most effective system for both mechanical and electrical performance under flexural strength, although it showed a slight decrease in performance under direct tension compared to the control mixture. The self-sensing response remained reliable and effective across different loading scenarios. Additionally, it displayed consistent behavior and high FCER values during repeated loading and unloading cycles. These findings affirm the potential to develop an effective, sustainable, and economical self-monitoring system for cement-based materials, suitable for various mechanical and electrical applications in the field.