A multistage coupling test was designed to investigate the deterioration behavior of basalt fiber concrete under the coupled interaction of load and freeze–thaw cycles. The damage laws of the strength and durability of basalt fiber concrete under coupling action were investigated, along with the evolution of the pore structure and microscopic morphology. The alleviating effects of basalt fibers on the properties and structural deterioration were evaluated. The compressive and bending strengths exhibited a three-phase variation pattern, and the reduction rate of the strength of the basalt fiber concrete was lower than that of ordinary concrete. The electric flux increased parabolically under the double-field coupling, and the trend and inflection point of the relative dynamic elastic modulus changed with the coupling stages. The pores of basalt fiber concrete mainly expand and coarsen, and basalt fibers suppress the increase in pore size and reduce the number of multiple detrimental pores. The toughening of basalt fibers can inhibit crack propagation in the width direction and improve the compactness of the microstructure.
Li et al. (Fri,) studied this question.