BS/EN 12697-17-2017 pdf download.Bituminous mixtures – Test methods Part 17 : Particle loss of porous asphalt specimens.
2 Normative references
The following documents, In whole or in part, are normatively referenced In this document and are indispensable for its application. For dated relerences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1097-2, Tests [or mechanical and physical properties of aggregates – Part 2: Methods for the determination of resistance to fragmentation
EN 12697-5, Bituminous mixtures – Test methods for hot mix asphalt – Part 5: Determination of the maximum density
EN 12697-6, Bituminous mixtures – Test methods for hot mix asphalt – Part 6: Determination of bulk density of bituminous specimens
EN 12697-8, Bituminous mixtures – Test methods for hot mix asphalt – Part 8: Determination of void characteristics of bituminous specimens
EN 12697-30, Bituminous mixtures – Test methods for hot mix asphalt – Part 30: Specimen preparation by impact compactor
EN 12697-3 1, Bituminous mixtures – Test methods for hot mix asphalt- Part 31: Specimen preparation by gyratory compactor
EN 12697-35, Bituminous mixtures – Test methods- Part 35: Laboratory mixing
3 Apparatus
3.1 Los-Angeles-machine, as specified in EN 1097-2.
3.2 Thermometer, capable of covering the test temperature range with an accuracy of ± 0,5 °C.
3.3 Chamber, room or enclosure, large enough for the Los-Angeles-machine. During the test, the air temperature in the chamber shall remain constant to the test temperature ± 2 °C. The air temperature shall be measured near the Los-Angeles-machine.
3.4 Oven, equipped with a closed ventilation system or a chamber fitted with a thermostatic control to maintain the test temperature constant In the vicinity of the samples, stored prior to the test, to ± 1 °C.
3.5 Balances, of suitable capacity for the mass to be weighed with an accuracy of ± 0,1 % and a resolution of 0,1 g.
NOTE 1 The compaction method has an influence on the result.
NOTE 2 For mixtures with a bulk density of approximately 2,0 Mg/rn1, specimens with a diameter of (100 ± 3) mm and a height of (63,5 ± 2.5) mm should comply.
4.3 When using asphalt with an aggregate size greater than 16 mm, larger samples shall be manufactured and cored to achieve the correct size.
4.4 After the specimens have been compacted and removed from the mould, their bulk density and void content, shall be determined in accordance with EN 12697-6 (Procedure D: bulk density by dimensions) and EN 12697-8, respectively. Maximum density is determined in accordance with
EN 12697-5.
NOTE The density of the specimens can affect the result because the mass of a specimen will influence the impact force imparted on contact during the test, particularly when asphalt with aggregates of high or low density is tested.
4.5 Prior to the start of testing, the specimens shall be stored on a flat surface at a temperature of not
more than 25 °C for between 48 h and 42 days from the time of their manufacture.
NOTE The storage time influences the mechanical properties of the specimen.
For test purposes other than for Type testing, different storage times may be applied.
5 Procedure
5.1 The test temperature shall be defIned and maintained in the chamber during the test with an uncertainty of± 2 °C. Before testing, specimens shall be kept at the test temperature for at least 4 h.
NOTE Test temperature has a very large influence on the test result. Temperatures between 15 °C and 25 °C are usually used for design purposes. For porous asphalt in cold climate zones, temperatures representing the Low temperature local conditions can also be used. The test is not suitable for temperatures above 35 °C.
5.2 The mass of specimen shall be determined and W1 (see Clause 6) shall be recorded. One specimen shall then be placed inside the Los-Angeles-machine drum and, with the metal balls removed, the drum shall be turned at 3,1 rad/s to 3,5 rad/s (30 rpm to 33 rpm) for 300 turns.
5.3 When the test is completed, the specimen shall be removed from the machine, slightly cleaned by means of a cloth eliminating particles that are clearly loose, and weighed again. The reading W2 (see Clause 6) shall be recorded.BS/EN 12697-17-2017 pdf download.
BS/EN 12697-17-2017 pdf download
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