Bond-slip response of steel fibers after exposure to elevated temperatures: Experimental program and design-oriented constitutive equation

This study aimed to evaluate the effect of elevated temperatures on bond-slip behavior hooked-end steel fibers. A total 180 pullout specimens were tested in post-cooling conditions using a double-sided test with multiple embedded fibers for target between 25 and 750 °C. Results proved that bond strength significantly increases up 450 °C, drastically decreases 600 The contribution hooks reduced temperature is negligible higher than while fiber-matrix frictional interaction seems improve all evaluated. temperature-sensitive constitutive equation allows simulating proposed its suitability confirmed through numerical model.