BS EN 12697-22 pdf free download

BS EN 12697-22-2020 pdf free download.Bituminous mixtures — Test methods Part 22: Wheel tracking.
This document describes test methods for determining the susceptibility of bituminous materials to deform under load. The test is applicable to mixtures with upper sieve size less than or equal to 32 mm. The tests are applicable to specimens prepared from asphalt mixtures that have either been manufactured in a laboratory or cut from a pavement; test specimens are held in a mould with their surface flush with the upper edge of the mould. The susceptibility of bituminous materials to deform is assessed by the rut formed by repeated passes of a loaded wheel at constant temperature. Three alternative types of device can be used according to this standard: large-size devices, extra large-size devices and small-size devices. With large-size devices and extra large-size devices, the specimens are conditioned in air during testing. With small-size devices, specimens are conditioned, in either air or water. NOTE Large-size and extra large-size devices are not suitable for use with cylindrical cores.
2 Normative references The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
specimens
EN 12697-7, Bituminous mixtures — Test methods for hot mix asphalt — Part 7: Determination of bulk density of bituminous specimens by gamma rays
EN 12697-27, Bituminous mixtures — Test methods — Part 27: Sampling
EN 12697-33, Bituminous mixtures — Test method — Part 33: Specimen prepared by roller compactor
EN 12697-35, Bituminous mixtures — Test methods — Part 35: Laboratory mixing
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between 10 IRHD and 100 IRHD
ISO 48-5, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 5: Indentation hardness by IRHD pocket meter method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1 nominal thickness for laboratory prepared specimens, the target thickness, in millimetres, to which the specimens are to be prepared
Note 1 to entry: The target thickness is the required thickness that is targeted when making the specimen.
3.2 rut depth
reduction in the thickness of a test specimen, in millimetres, caused by repeated passes of a loaded wheel
3.3 test surface
surface of the test specimen on which the loaded wheel runs
3.4 single test result
value obtained by applying this document, once, to a single test portion
3.5 test portion
number of samples that are required to be tested for a single test result
3.6 tyre track
impression of the tyre on a flat surface when a vertical load is applied
3.7 load cycle
two passes (outward and return) of the loaded wheel
3.8 measurement sequence
test phase corresponding to the completion of n load cycles
4 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviations given in Table 1 apply.
5 Principle
The susceptibility of a bituminous material to deform is assessed by measuring the rut depth formed by repeated passes of a loaded wheel at a fixed temperature.
6 Apparatus
6.1 Large size devices
6.1.1 Device simulating a rolling load which shall include
6.1.1.1 Wheel fitted with a 400 × 8 pneumatic tyre without tread pattern and having a track width of (80 ± 5) mm. The pneumatic tyre pressure shall be (600 ± 30) kPa. NOTE The Trelleborg T522 BV Extra or Special 6-ply type pneumatic tyre is suitable for this test.
6.1.1.2 The travel of pneumatic tyre relative to the specimen shall be (410 ± 5) mm.
6.1.1.3 The frequency of travel (outward and return) shall be (1,0 ± 0,1) Hz.BS EN 12697 pdf download.