Evaluation of the Sulfate Erosion Resistance in Fly Ash Concrete Subjected to Electric Fields

Right now, there are limited studies on how concrete soil resists sulfate when an electric field and fly ash are used together, and the theory behind stray current engineering protection is not fully developed. This study looks at concrete mixed with fly ash when an electric field is applied. It investigates how well it can resist damage from sulfate and helps explain how its strength and tiny structure change, aiming to fill a gap in current research. The effect of fly ash mortar on the sulfate resistance of concrete and its microscopic mechanism were studied. In this study, the water–cement ratio (W/C) was 0.3, 0.4, and 0.5, respectively, the content of fly ash varied at 0%, 20%, and 40%, and the soaking mode was full‐immersion and semi‐immersion. The age was divided into 14 days and 28 days to research the effects of fly ash content, W/C, age, and soaking method on the mechanical properties and microstructure of concrete mixed with FAM against sulfate erosion. The results show that incorporating 20% fly ash optimizes both compressive strength and sulfate erosion resistance, while higher contents (e.g., 40%) reduce durability. A lower W/C (0.3) enhances compressive strength but slightly reduces sulfate erosion resistance. Electric field curing moderately improves sulfate erosion resistance, with the highest sulfate erosion resistance observed at 14 days. These highlight the significance of optimizing fly ash and curing conditions to progress the durability of concrete in sulfate‐rich situations, subsequently advancing the feasible utilization of green building materials. Its long‐term durability under field conditions needs to be further studied. This research provides a new idea for improving the durability of fly ash concrete in sulfate environment and promotes the sustainable development of green building materials.