Abstract: To explore the adaptability and mechanism of the coral sand concrete under the salt spray corrosion environment, the laboratory accelerated simulation tests were conducted. The test results showed that the coral sand concrete with the high strength level had a better adaptability under the salt spray corrosion environment compared to the coral sand concrete with the low strength level. The resistance of the conventional concrete to the salt spray corrosion was higher than that of the coral sand concrete with the same strength level; The compressive strength of the coral sand concrete first increases and then decreases with the increase of the salt spray corrosion time; The reduction in the compressive strength of the conventional concrete is smaller than that of the coral sand concrete of the same strength grade; Due to the accumulation of the corrosion products, the quality of each group of coral sand concrete (excluding CA-20) increases with the increase of the salt spray corrosion time, while the quality of CA-20 decreases due to small surface peeling in the later stage of the corrosion; The surface chloride ion concentration of each group of the coral sand concrete shows a trend of first rapid increase and then slow increase with the increase of the salt spray corrosion time. The apparent chloride ion concentration of each group of the coral sand concrete shows a trend of first rapid decrease and then gradually stable with the increase of the salt spray corrosion time. Under the same erosion time, the surface chloride ion concentration and the apparent chloride ion diffusion coefficient of the conventional concrete are lower than those of the coral sand concrete of the same strength grade.

Key words: Coral Sand, Salt Spray Corrosion, Physical and Mechanical Properties, Chloride Ion Content