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Salt frost scaling is the progressive deterioration of the concrete surface associated with freezing and thawing in the presence of a salt solution.Its major mechanism has been confirmed to be cryogenic suction that promotes continuous ice growth in the surface region.In this paper, salt frost scaling of different air-entrained concretes is investigated, alone with the room-temperature sorptivity measurement.A clear correlation is found between the two properties, which is supported by a theoretical analysis on the sorptivity.These findings explain why HPC of low w/b ratio and associated low capillary porosity has much improved scaling resistance.Similar benefits are obtained for regular w/b ratio concrete containing high cementitious replacement level of slag cement.