Abstract: To investigate the confinement mechanism of textile-reinforced mortar (TRM) on concrete, low-strength mortar was used as the TRM matrix to minimize the impact of its axial bearing capacity on stress-strain behaviors. Axial compression tests were performed on 18 concrete column specimens, including 3 reference columns and 15 confined columns, to examine their failure modes and the characteristics of the stress-strain curves. The test outcomes were compared with the predictions from a classical analysis-oriented stress-strain model for fiber-reinforced polymer (FRP)-confined concrete. The findings indicate that TRM's confinement effect aligns with the typical passive confinement characteristics observed in concrete, with significant activation of this effect when the axial strain surpasses the peak strain of plain concrete. Before the activation of the confinement effect, the stress-strain behavior of TRM-confined concrete resembles that of plain concrete, which is then followed by a phase of rapid decline with a relatively weaker confinement effect. However, the rate of decline is substantially slower than that of unconfined concrete. Additionally, when more than two textile layers are used, it is possible to overcome the stiffness shortcomings of the loading system, allowing for a complete analysis of the descending portion of the high-strength concrete stress-strain curve. The FRP-confined concrete stress-strain model effectively captures the confinement effect of TRM on concrete, especially in matching the slope of the curve during the confinement activation phase with the experimental data.