This study experimentally investigates the Hybrid Effect of Steel Fiber (SF) and Recycled Rubber Powder (RRP) on Freeze-Thaw (F-T) Resistance and Pore Structure of Concrete. With respect to the mechanical properties of Steel Reinforced Concrete (SRC) before and after F-T cycles, the mixture incorporating 1.5% SF and 10% RRP achieves the optimal performance, exhibiting a distinct positive hybrid effect with the γ of the tensile-to-compressive strength ratio of 1.427. The synergistic interaction between SF and RRP preserves the compressive strength and significantly enhances the tensile performance of SRC. Meanwhile, it alleviates the degradation of mechanical properties to a certain extent during 100–200 F-T cycles, enabling effective control over the mass loss and elastic modulus loss of SRC. Results from pore structure analysis reveal that SF and RRP exhibit a distinct negative hybrid effect on the porosity of SRC—a phenomenon that indicates the filling effect of RRP contributes to enhanced compactness of the concrete matrix.
Hu et al. (Thu,) studied this question.