Abstract
This study focused on relationship between frost damage resistance and air-void system in concrete. Analysis using 200 concrete experimental data shows that entrained air content in fresh status tend to decrease during hardening process, which appears significant in concrete using fly-ash with moderate heat portland cement. As a result, correlation between durability factor representing frost damage resistance and entrained air content measured after hardening is higher than that measured in fresh status. This tendency is more remarkable in concrete using fly-ash with moderate heat portland cement than using normal portland cement. Spacing factor in concrete does not mean identical air-void size distribution as being affected by entrained air content and specific surface. Hence even with the same spacing factor values, concrete containing air void less than 0.15mm diameter tends to show better frost damage resistance.
