BS EN 12697-45:2020 pdf free.Bituminous mixtures – Test methods.Saturation Ageing Tensile Stiffness (SATS) conditioning test.
BS EN 12697-45 This document specifies a test method to assess the durability of adhesion in base and binder course asphalt mixtures. The Saturation Ageing Tensile Stiffness (SATS) conditioning regime is used to age the specimens in the presence of water. A comparative test for assessing their performance before and after conditioning is also conducted.The applicability of this test method is limited to bituminous specimens with consistent air voids contents and hard binder, in particular, to asphalt concrete mixtures with a binder content between 3,5 % and 5,5 %, air voids contents between 6 % and 10 % and 10/20 pen hard paving grade bitumen. The test is intended to be used as a screening test for the assessment of a combination of aggregate, filler and additives with respect to the retained adhesion properties after simulated ageing in a moist atmosphere for lean/stiff base and binder course mixtures.Nominally identical test specimens are subjected to moisture saturation by a vacuum system. They are then transferred into a pressurized vessel partially filld with water where they are subjected to a conditioning procedure by storage at 85。C temperature and 2,1 MPa pressure for 65 h. The ratios of the stiffness, measured by indirect tension on cylindrical specimens, before and after conditioning by storage under increased pressure and elevated temperature on the individual specimens situated above the water are averaged to determine the sensitivity of the material to ageing and moisture. The whole process is referred to as the Saturation Ageing Tensile Stiffness (SATS) conditioning test. The average ratio is the SATS durability index of the mixture components when the comparative test is the indirect tensile stiffness modulus.The fifth sample is placed so that, unlike the other samples, it is submerged during the test. As such, it is not included in the averaging to produce the overall result. The ratio for this fifth sample can be used to provide additional information on the properties of the mixture.
NOTE The form and dimensions of the pressure vessel and specimen tray shown in Figures 1 and 2 have been found to be practicable in the SATS test when used with different aggregate types. Other forms of pressure vessel and specimen tray can also be suitable, but have not yet been specifically investigated. However, early work carried out in a standard binder pressure ageing vessel in EN 14769 yielded similar results to those generated using the apparatus described in this document.BS EN 12697-45 pdf download.