Effect of Curing Age on Pull-Out Response of Carbon, Steel, and Synthetic Fiber Embedded in Cementitious Mortar Matrix

Fiber-matrix interface bonding is an important area of concern in fiber-reinforced composites because it directly related to the mechanical behavior composites. In this study, interfacial bond properties four types fiber at different curing ages were investigated by analyzing pull-out responses. Special attention was given fiber–matrix behavior, including tensile strength, average equivalent and energy. Pull-out tests conducted 7, 14, 28, 56 days curing. Different failure modes steel fiber, synthetic macrofiber, polyacrylonitrile (PAN)-based carbon pitch-based investigated. According force versus slip curves, patterns recorded based on type. Carbon fibers experienced a sudden drop after reaching peak load, whereas load decrease not as abrupt. Results also confirmed that exhibited highest energy absorption capacity followed lower values for fibers. While monofilament able absorb 1,050 N·mm, twisted bundles could 277 55 respectively. However, strength straight comparable still than fiber. It derived from experimental data increase cement matrix age correlates improvement maximum strength. These parameters identified compared all types.