Amirkabir University of Technology Amirkabir Journal of Civil Engineering 2588-297X 52 9 2020 11 21 Evaluation of the effect of strength, duration, water pressure and casting direction on concrete permeability Evaluation of the effect of strength, duration, water pressure and casting direction on concrete permeability 2379 2398 3516 10.22060/ceej.2019.16237.6166 FA Mahmood Naderi Department of civil engineering, Faculty of engineering, International Imam Khomeini university, Qazvin, Iran Alireza Kaboudan Department of civil engineering, Faculty of engineering, International Imam Khomeini university, Qazvin, Iran Journal Article 2019 04 30 One of the major factors which controls the serviceability life of a concrete structure is <br />its durability. Since the durability is dependent mainly on the permeability, some standards such as BS <br />EN 12390-8 and DIN 1048-5 are aimed for water permeability assessment of concrete. Based on these <br />standard test methods, a constant pressure is applied to the concrete surface, perpendicular to casting <br />direction for a specific period of time. Since the applied water pressure, test duration and the direction <br />of casting affect the concrete permeability, 150mm concrete cubes with water/cement ratios of 0.4, 0.5 <br />and 0.6 were prepared and at the ages of 7, 28 and 91 days (after water curing) the permeability of the <br />cubes was investigated, using “Cylindrical chamber” method. The results show that the penetration <br />depth and volume in the casting direction are lower than the respective values, obtained in the direction, <br />perpendicular to casting. It was also observed that, regarding the water/cement ratio, the exponent of <br />the power function used to approximate the relation of penetration depth and volume with pressure, <br />is approximately constant at a specific age and testing direction. This issue wasn’t observed when <br />approximating the relation of penetration depth and volume with test duration, using the power function. <br />A linear relationship between the penetration depth and the penetration volume was also observed. One of the major factors which controls the serviceability life of a concrete structure is <br />its durability. Since the durability is dependent mainly on the permeability, some standards such as BS <br />EN 12390-8 and DIN 1048-5 are aimed for water permeability assessment of concrete. Based on these <br />standard test methods, a constant pressure is applied to the concrete surface, perpendicular to casting <br />direction for a specific period of time. Since the applied water pressure, test duration and the direction <br />of casting affect the concrete permeability, 150mm concrete cubes with water/cement ratios of 0.4, 0.5 <br />and 0.6 were prepared and at the ages of 7, 28 and 91 days (after water curing) the permeability of the <br />cubes was investigated, using “Cylindrical chamber” method. The results show that the penetration <br />depth and volume in the casting direction are lower than the respective values, obtained in the direction, <br />perpendicular to casting. It was also observed that, regarding the water/cement ratio, the exponent of <br />the power function used to approximate the relation of penetration depth and volume with pressure, <br />is approximately constant at a specific age and testing direction. This issue wasn’t observed when <br />approximating the relation of penetration depth and volume with test duration, using the power function. <br />A linear relationship between the penetration depth and the penetration volume was also observed. https://ceej.aut.ac.ir/article_3516_cf1cf43cba274ae7f413e864682b80f8.pdf