Fiber reinforced cementitious materials, when exposed to a fire, can have better residual mechanical properties than plain cementitious materials, particularly the tensile property. One critical factor governing the residual bridging effect is the fiber-matrix bond performance. However, the effect of temperature on the residual interfacial bond performance remains poorly understood. Here, based on the pull-out tests, we investigate the residual interfacial behavior of aligned straight and hooked-end steel fibers embedded into nine groups of matrices exposed to temperature levels from 20 °C to 600 °C with an interval level of 100 °C. Specifically, cement paste, mortar, and concrete with three w/c ratios (0.3, 0.4, and 0.5) are considered. Meanwhile, based on thermoelastic mechanics and the pulley frictional model, we quantitatively analyze the effect of thermal shrinkage, thermal incompatibility, deformation of hook end, and fiber and matrix degradation on residual interfacial bond performance. By combining the analysis and test results, we show that the thermal shrinkage can enhance the fiber-cement paste bond performance. The thermal incompatibility can impose negative effects upon the residual bond performance of all the fiber-matrix systems. Interestingly, we find that the decrease of the angle of the hook end can to some extent improve the peak pull-out force of the hooked-end fibers. Moreover, we also find that the degradation of fiber yielding strength and non-straightening hook end are the main causes of the reduction in the residual peak pull-out force of hooked-end steel fibers.

纤维增强的水泥质材料在暴露于火中时，具有比普通水泥质材料更好的残留机械性能，特别是拉伸性能。控制残余桥接效应的一个关键因素是纤维-基质粘结性能。然而，温度对残余界面键性能的影响仍然知之甚少。在这里，基于拉出测试，我们研究了嵌入到9组矩阵中的对齐直管和弯头钢纤维的残余界面行为，该矩阵暴露于20°C至600°C的温度水平，间隔水平为100° C。具体而言，水泥浆，砂浆和混凝土的w / c为3考虑比率（0.3、0.4和0.5）。同时，基于热弹性力学和滑轮摩擦模型，我们定量分析了热收缩率，热不相容性，钩端变形以及纤维和基质降解对残余界面粘结性能的影响。通过分析和测试结果的结合，我们表明热收缩可以增强纤维-水泥浆的粘结性能。热不相容性可能对所有纤维-基质体系的残余粘合性能产生负面影响。有趣的是，我们发现减小钩端角度可以在一定程度上提高钩端纤维的峰值拔出力。此外，