عنوان مقاله [English]
One of the major factors which controls the serviceability life of a concrete structure is
its durability. Since the durability is dependent mainly on the permeability, some standards such as BS
EN 12390-8 and DIN 1048-5 are aimed for water permeability assessment of concrete. Based on these
standard test methods, a constant pressure is applied to the concrete surface, perpendicular to casting
direction for a specific period of time. Since the applied water pressure, test duration and the direction
of casting affect the concrete permeability, 150mm concrete cubes with water/cement ratios of 0.4, 0.5
and 0.6 were prepared and at the ages of 7, 28 and 91 days (after water curing) the permeability of the
cubes was investigated, using “Cylindrical chamber” method. The results show that the penetration
depth and volume in the casting direction are lower than the respective values, obtained in the direction,
perpendicular to casting. It was also observed that, regarding the water/cement ratio, the exponent of
the power function used to approximate the relation of penetration depth and volume with pressure,
is approximately constant at a specific age and testing direction. This issue wasn’t observed when
approximating the relation of penetration depth and volume with test duration, using the power function.
A linear relationship between the penetration depth and the penetration volume was also observed.
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