The performance and durability of concrete is always affected by atmospheric conditions, chemical ions and mechanical loads, which reduce its bearing capacity, leading to the occurrence of accidents. Macrosynthetic fibre-reinforced concrete, as an alternative material, is used to improve the corrosion resistance of underground structures. In this study, accelerated corrosion tests were designed to investigate the change in compressive strength, elastic modulus and fracture toughness of concrete soaked in sulfate environment. Microscopic monitoring techniques, including scanning electron microscopy and energy-dispersive X-ray spectroscopy, were adopted to find changes in the structure. Compared to macrosynthetic fibre-reinforced concrete and ordinary concrete soaked in sulfate corrosion environment, the results indicated that macrosynthetic fibre improved the structure compactness of concrete; the losses of elastic moduli and compressive strength of the specimens soaked in sulfate were reduced. The maximum crack initiation load of macrosynthetic fibre-reinforced concrete was enhanced. Through microstructure monitoring, it is found that macrosynthetic steel fibre contributes to a remarkable improvement in the fracture resistance of concrete.
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