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BS EN 12697-22:2020

BS EN 12697-22:2020

$142.49

Bituminous mixtures. Test methods – Wheel tracking

Published By Publication Date Number of Pages
BSI 2020 32
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
7 1 Scope
2 Normative references
3 Terms and definitions
8 4 Symbols and abbreviated terms
9 5 Principle
6 Apparatus
6.1 Large size devices
6.1.1 Device simulating a rolling load which shall include
10 6.1.2 Mould(s)
6.1.3 Depth gauge
6.1.4 Ventilated enclosure
6.1.5 Temperature sensors
6.1.6 Temperature monitoring indicator
6.1.7 Steel supporting plate
6.1.8 Non-stick chemical
6.2 Extra large devices
6.2.1 Device simulating a rolling load which shall include
11 6.2.2 Moulds
6.2.3 Depth gauge
6.2.4 Ventilated enclosure
6.2.5 Temperature sensors
6.2.6 Temperature monitoring indicator
6.3 Small size devices for use with rectangular plates
6.3.1 Wheel-tracking apparatus
12 6.3.2 Means for temperature control
6.3.3 Straightedge
6.3.4 Callipers
6.3.5 Talc or steatite
6.3.6 Moulds
13 6.3.7 Holding medium
6.4 Small-size devices for use with cores
6.4.1 General
6.4.2 Abrasive disc circular saw
6.4.3 Core clamping assembly
6.4.4 Cleansing solvent
6.4.5 Holding medium
6.4.6 Containers
6.4.7 Spirit level
7 Sampling and sample preparation
7.1 Test portion
14 7.2 Sampling and manufacture
7.2.1 Laboratory prepared samples
7.2.1.1 Manufacture
7.2.1.2 Nominal thickness
15 7.2.2 Specimen extracted from pavements
7.2.2.1 Cut specimens
7.2.2.2 Core specimens
7.2.2.3 Density
7.2.2.4 Marking
7.2.2.5 Trimming
7.3 Thickness and surface regularity
7.3.1 Large and extra-large size devices
7.3.2 Small size devices
16 7.4 Transport and storage of unmounted specimens
7.5 Sample preparation
7.5.1 Laboratory-prepared specimen
7.5.2 Specimen extracted from pavements
7.5.2.1 Cut specimen
7.5.2.2 Core specimen
7.6 Storage
7.7 Temperature probes
17 8 Procedure for carrying out a single measurement
8.1 Large size devices
8.1.1 Pneumatic tyre
8.1.2 Conditioning run
8.1.3 Initial readings
8.1.4 Temperature conditioning
8.1.5 Execution of test
8.1.6 Temperature monitoring
18 8.2 Extra-large size device
8.2.1 Pneumatic tyre
8.2.2 Temperature conditioning
8.2.3 Execution of test
8.2.4 Temperature monitoring
8.2.5 Repeat runs
8.3 Small size devices
8.3.1 Temperature conditioning
8.3.2 Specimen fixing
19 8.3.3 Conditioning runs
8.3.4 Procedure A
8.3.5 Procedure B
9 Calculation and expression of results
9.1 Large size devices
9.1.1 Calculation of the proportional rut depth
20 9.1.2 Graph
9.1.3 Calculation of the mean value PiLD
9.1.4 Calculation of the test temperature
9.2 Extra-large size device
9.2.1 Calculation of the measured proportional rut depth
9.2.2 Calculation of the mean value PiXL
9.2.3 Calculation of the test temperature
21 9.3 Small size devices
9.3.1 Procedure A
9.3.1.1 Wheel-tracking rate
9.3.1.2 Mean wheel-tracking rate
22 9.3.1.3 Mean rut depth
9.3.2 Procedure B in air
9.3.2.1 Wheel-tracking slope in air
9.3.2.2 Mean wheel-tracking slope in air
9.3.2.3 Proportional rut depth, PRDAIR, in air
23 9.3.2.4 Mean proportional rut depth, PRDAIR, in air
9.3.2.5 Mean rut depth, RDAIR, in air
9.3.3 Procedure B in water
9.3.3.1 Wheel-tracking slope in water
9.3.3.2 Mean wheel-tracking slope in water
9.3.3.3 Mean proportional rut depth, PRDW
9.3.3.4 Mean rut depth, RDW
24 10 Test report
10.1 Obligatory information
10.1.1 Obligatory information for each test specimen
10.1.2 Obligatory information for laboratory prepared test specimens
10.1.3 Obligatory information for test specimens taken from a pavement by coring
10.1.4 Obligatory information for test specimens tested on large or extra large devices
25 10.1.5 Obligatory information for test specimens tested on small size devices
10.2 Complementary information
26 11 Precision
11.1 General
11.2 Laboratory prepared samples, proportional rut depth, large size devices
11.3 Samples cored from a pavement and laboratory prepared samples, wheel-tracking rate, small-size devices, conditioning in air
27 11.4 Samples cored from a pavement and laboratory prepared samples, wheel-tracking rate, small-size devices, conditioning in air, procedure B

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BS EN 12697-22:2020
$142.49