Permeability coefficient of high fluidity concrete with relation to permeating duration due to high water pressure

Permeability is always used to describe the property of cementitious materials that can be pervaded by water or other solutions. It has a great influence on the other performances such as frost resistance, corrosion resistance and leaching resistance. The volume of permeated water due to a stable water pressure was measured by means of a fully automatic water permeability apparatus in order to obtain the permeability coefficient. Instead of a sustained phenomenon, a gradual variation on permeability coefficient in relation to permeating duration was observed. The stable permeability coefficient was defined based on regression analysis. At last, the relationships between stable permeability coefficient and the mass of cementitious materials as well as W/C ratios were constructed.