LAUSR

This research examined air-permeability of concrete mock test piece uses various kinds of binding material. The parameter of the experiment was various kinds of binding material, water binding material ratio, and an age of demold. When the water-cement ratio is small and the hydration is slow, the air-permeability is small. Influence of the age of demold was admitted only by the rapid air-permeation speed. The relation between the depth of neutralization and the air-permeability coefficient was able respectively to be shown by Portland cement, Portland blast-furnace slag cement, and Portland fly-ash cement in one line. However, coefficients of determination were smaller than the researches in the past.