ABSTRACT
The applicability of new in-situ testing method for permeability with regard to the durability of concrete structures, of which original concept has been proposed by authors, is examined from experiments and its extension is examined based on the diffusion theory. In the experiments, the rapid permeability coefficient defined by authors was measured in the various conditions of water cement ratio, moisture content and curing period. The higher the water cement ratio and the less the moisture content, the higher the rapid permeability coefficient. Then, the coefficient of variation in test was ranged from 15% to 30%. The analytical study showed that the diffusivity in pressure diffusion equation, being assumed as two dimensional pressure flow from the wall of a test hole, corresponded well to the change of water cement ratio and the moisture condition within the range of diffusivity obtained by conventional permeability test. In conclusion, this method was judged promising for the in-situ permeability test.
