ISO 1920-11:2013 pdf download.Testing of concrete — Part 11: Determination of the chloride resistance of concrete, unidirectional diffusion.
ISO 1920-11:2013 specifies a method for determining the unidirectional non-steady-state chloride penetration parameters of conditioned specimens of hardened concrete. The test method enables the determination of the chloride penetration at a specified age, e.g. for ranking of concrete quality by comparative testing.
Introduction
Steel reinforced concrete structures exposed to the ingress of chloride, either from seawater or other sources, need to be durable for at least the intended service life. The possibility of reinforcement corrosion is significantly increased as the chloride level at the embedded reinforcement increases. For this reason, the chloride diffusivity or chloride penetrability of the concrete is an important property to measure and this International Standard sets out a test method that may be applied to specimens cast to assess the potential chloride resistance of a concrete mix.
NOTE This test method takes a minimum of 119 days comprising a minimum age of the specimen prior to testing of 28 days, a minimum of one day to prepare and condition the specimen and then 90 days to expose the specimen to the chloride solution. Different periods of curing and exposure may be set (and stated in the test report) in order to adjust the test duration.
6.2 Conditioning and preparation of profile specimen for chloride testing
6.2.1 Vacuum saturation of the profile specimens
After sawing the specimens, vacuum saturate the profile specimens with water. Annex D shows a typical arrangement for vacuum saturation. Place the profile specimens in the vacuum container and reduce the absolute pressure to a value between 10 mbar and 50 mbar (1 kPa to 5 kPa) within a few minutes of closing the container. Maintain this absolute pressure for 3 h and then with the vacuum pump still running, fill the container with distilled or demineralized water so that all the profile specimens are immersed. Maintain the absolute pressure for a further hour before allowing air to re-enter the container.
Leave the profile specimens immersed in water until the process of surface sealing starts.
The test may be carried out without vacuum saturating the profile specimen in water, as described in this clause. If the profile specimen is not vacuum saturated in water, this shall be mentioned in the test report in order to allow comparison of the test results obtained by the same procedure.
6.2.2 Sealing surfaces other than the surface to be exposed.ISO 1920-11:2013 pdf download