Abstract：The deterioration of concrete materials in salt lake and saline soil area with water level fluctuation is a key problem. In this work, the erosion tests, mechanical tests of material and microscopic tests of basalt fiber reinforced concrete under the action of dry-wet cyclic erosion of sulfate solution with different mass concentrations were carried out to analyze and explore the evolution law of those affected parameters such as compressive strength, splitting tensile strength, mass change and relative dynamic elastic modulus of concrete specimens. The degradation mechanism of basalt fiber reinforced concrete under different immersion concentrations and with different ages was revealed. Based on the apparent morphology and meso-structure characteristics of concrete specimens after erosion, the evolution mechanism of meso-structure of concrete mixed with basalt fiber under different erosion cycles was studied. The results show that the compressive strength and splitting tensile strength of concrete reinforced with 6 mm long basalt fiber are better than those with a length of 12 mm. The deterioration law of basalt fiber reinforced concrete under sulfate and dry-wet cycle erosion is influenced by synergistic actions of sulfate solution concentration, dry-wet cycles and fiber content. The main sulfate erosion products under the action of dry-wet cycle are gypsum erosion and ettringite erosion. The sulfate-resistance of basalt fiber reinforced concrete is obviously superior to that of plain concrete.
