SIST-TS CEN/TS 12697-50:2016

SLOVENSKI STANDARD
SIST-TS CEN/TS 12697-50:2016
01-junij-2016
Bitumenske zmesi - Preskusne metode - 50. del: Odpornost proti površinski obrabi
Bituminous mixtures - Test methods - Part 50: Resistance to scuffing
Asphalt - Prüfverfahren - Teil 50: Widerstand gegen Oberflächenverschleiß
Mélanges bitumineux - Méthodes d'essai - Partie 50: Résistance aux arrachements
superficiels
Ta slovenski standard je istoveten z: CEN/TS 12697-50:2016
ICS:
93.080.20 Materiali za gradnjo cest Road construction materials
SIST-TS CEN/TS 12697-50:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN/TS 12697-50:2016

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SIST-TS CEN/TS 12697-50:2016


CEN/TS 12697-50
TECHNICAL SPECIFICATION

SPÉCIFICATION TECHNIQUE

April 2016
TECHNISCHE SPEZIFIKATION
ICS 93.080.20
English Version

Bituminous mixtures - Test methods - Part 50: Resistance
to scuffing
Mélanges bitumineux - Méthodes d'essai - Partie 50: Asphalt - Prüfverfahren - Teil 50: Widerstand gegen
Résistance aux arrachements superficiels Oberflächenverschleiß
This Technical Specification (CEN/TS) was approved by CEN on 11 February 2016 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to
submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS
available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in
parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12697-50:2016 E
worldwide for CEN national Members.

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Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Principle . 6
4 Terms, definitions, symbols and abbreviations . 7
4.1 Terms and definitions . 7
4.2 Symbols and abbreviations . 7
5 Preparation of test specimens . 7
5.1 General . 7
5.2 Compaction of the slabs . 7
5.3 Dimensions of the specimens . 8
5.4 Age of the specimens . 8
5.5 Dimensions and bulk density of the specimens . 8
6 Loading devices . 8
7 Test results . 9
8 Test report . 10
8.1 General . 10
8.2 Precision . 11
8.2.1 Repeatability . 11
8.2.2 Reproducibility . 11
Annex A (normative) The ARTe . 12
A.1 Equipment . 12
A.1.1 General . 12
A.1.2 Lateral moving table . 12
A.1.3 Set of rotating wheels . 12
A.1.4 Slab fixation box . 13
A.1.5 Temperature controlled room . 13
A.1.6 Temperature measuring devices . 13
A.1.7 Electric fan (optional) . 13
A.2 Test procedure . 14
Annex B (normative) The Darmstadt device . 18
B.1 Equipment . 18
B.1.1 General . 18
B.1.2 Lateral moving table . 18
B.1.3 Test tyre . 18
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B.1.4 Asphalt specimen fixture . 18
B.1.5 Heating/temperature . 18
B.1.6 Vacuum wipe-off apparatus . 19
B.1.7 Temperature measurements . 19
B.1.8 Oven . 19
B.2 Test procedure . 19
Annex C (informative) The Rotating Surface Abrasion Test (RSAT) . 22
C.1 General . 22
C.2 Equipment . 22
C.2.1 Motion mechanism . 22
C.2.2 Test tyre . 23
C.2.3 Wheel load and contact pressure. 23
C.2.4 Wheel arm guide . 24
C.2.5 Attachment of the wheel to the wheel arm . 24
C.2.6 Rotation hinge (wheel arm guide) . 24
C.2.7 Slab holder test specimen RSAT . 24
C.2.8 Bearing and rotary axle, consisting of a ring bearer . 25
C.2.9 Braking mechanism . 25
C.2.10 Asphalt specimen fixture . 25
C.2.11 Vacuum wipe-off apparatus . 26
C.3 Test temperature . 26
C.3.1 Heating/temperature . 26
C.3.2 Temperature measurements . 26
Annex D (informative) The TRD (TriboRoute Device) . 29
D.1 Equipment . 29
D.1.1 General . 29
D.1.2 Load applicator . 29
D.1.3 Lateral moving table . 30
D.1.4 Asphalt specimen fixture . 30
D.1.5 Heating/temperature . 30
D.1.6 Vacuum wipe-off apparatus . 31
D.2 Test procedure . 31
D.2.1 Specimen preparation . 31
D.2.2 Control of the specimen surface characteristics . 31
D.2.3 Test performance . 32
D.2.3.1 General . 32
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D.2.3.2 Test performed with controlled force (TRD-CF). 32
D.2.3.3 Test performed with controlled displacement rate (TRD-CD) . 33
Bibliography . 34

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European foreword
This document (CEN/TS 12697-50:2016) has been prepared by Technical Committee CEN/TC 227
“Road materials”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
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1 Scope
This European Technical Specification specifies a test method for determining the resistance to scuffing
of asphalt mixtures which are used in surface layers and are loaded with high shear stresses in road or
airfield pavement. These shear stresses occur in the contact area between tyre and pavement surface
and can be caused by cornering of the vehicle. Due to these shear stresses, material loss will occur at the
surface of these layers. The test is normally performed on asphalt layers with a high amount of air voids
(e.g. porous asphalt), but can also be applied on other asphaltic mixtures. Test specimens are used
either produced in a laboratory or cut from the pavement.
NOTE The test is developed to determine the resistance to scuffing for noise reducing surface layers where
raveling is the normative damage criterion. The test can also be performed on other surface mixtures with a high
resistance to permanent deformation. In case a mixture has a low resistance to permanent deformation, rutting
can occur during the test. This can influence the test results.
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 references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 12697-6, Bituminous mixtures — Test methods for hot mix asphalt — Part 6: Determination of bulk
density of bituminous specimens
EN 12697-29, Bituminous mixtures — Test method for hot mix asphalt — Part 29: Determination of the
dimensions of a bituminous specimen
EN 12697-33, Bituminous mixtures — Test methods for hot mix asphalt — Part 33: Specimen prepared by
roller compactor
3 Principle
Laboratory compacted asphalt specimens or asphalt specimens cut from a pavement is fixed in a test
facility. In this facility, the asphalt material is loaded simultaneously with both normal and shear
stresses. Due to these stresses, material loss will occur from the surface of the slab. This material loss
depends on the resistance to scuffing of the tested asphalt mixture: the higher the resistance, the less
material will disappear.
To determine the resistance to scuffing, two slabs or (set of) cores shall be tested. The average of both
test results is reported as the resistance to scuffing.
In this Technical Specification four different kinds of loading facilities are described:
— The ARTe (the Aachener Raveling Tester);
— The DSD (the Darmstadt Scuffing Device);
— The RSAT (the Rotating Surface Abrasion Test) and
— The Triboroute.
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4 Terms, definitions, symbols and abbreviations
For the purposes of this document, the following term and definition, symbols and abbreviations apply.
4.1 Terms and definitions
4.1.1
material loss
amount of material that has been lost from the surface of the slab due to the test
Note 1 to entry: The amount of material loss can be determined in 3 different ways:
— Visually and/or by taking pictures;
— by weighing the mass of the slab before and after the test. The difference in mass per area is a measure for the
resistance to scuffing of the tested asphalt mixture;
— by scanning the surface of the slab before and after the test. The scans provide a 3D picture from the surface
of the slab. After subtracting mathematically the 3D picture after the test from the one before the test, an
accurate 3D overview of the material loss can be generated. The calculated volume of this 3D overview of the
material loss is a accurate value for the resistance to scuffing of the tested asphalt mixture.
Note 2 to entry: If permanent deformation occurs during the test, the results of the surface scan have to be
compensated for this phenomenon.
4.2 Symbols and abbreviations
T is the thickness of the slab, in 0,1 mm;
W is the width of the slab, in 0,1 mm;
L is the length of the slab, in 0,1 mm;
A 2
is the surface of the tested slab, in 0,01 mm ;
M is the mass of the slab before performing the test, in 1 grams;
0
M is the mass of the slab after performing the test, in 1 grams;
1
ΔM is the loss of mass due to performing the test, in 1 grams;
V 3
0 is the volume of the texture of the slab before performing the test, in 0,1 mm ;
V 3
1 is the volume of the texture of the slab after performing the test, in 0,1 mm ;
ΔV 3
is the loss of volume of the texture of the slab due to performing the test, in 0,1 mm .
5 Preparation of test specimens
5.1 General
To determine the resistance to scuffing of an asphalt mixture, 2 slabs or 2 (sets of) cores of that material
shall be tested. The average of both test results shall be considered to determine the resistance to
scuffing.
5.2 Compaction of the slabs
In the scuffing device, asphalt slabs or (sets of) cores shall be tested. These slabs or (sets of) cores shall
be prepared according to EN 12697-33 or can be cut from pavements.
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5.3 Dimensions of the specimens
The test can be performed on specimens with various dimensions. However, standard dimensions of
the slabs are (500 ± 20) mm by (500 ± 20) mm or (500 ± 20) mm by (320 ± 20) mm. Cores shall have a
standard diameter of (150 ± 2) mm. The thickness of the specimen can vary between 30 mm and
80 mm.
NOTE Also larger slabs or cores can be prepared which are fit to the correct dimensions by sawing.
5.4 Age of the specimens
Prior to the start of testing, the specimen shall be stored on a flat surface at a temperature of not more
than 20 °C for between 14 days and 42 days from the time of their manufacture. In the case of samples
requiring cutting, the cutting shall be performed no more than 8 days after compaction of the asphalt.
The time of manufacture for these samples is the time when they are cut.
NOTE Not only fresh asphalt mixtures can be tested, also aged specimens can be examined in the scuffing
test. In literature several aging procedure can be found. The choice of a proper aging procedure depends on the
characteristics of the tested material.
5.5 Dimensions and bulk density of the specimens
The dimensions of the slab shall be determined according to EN 12697-29. The length, L, and width, W,
of the slab are measured at four positions of the slab, equally divided over the area. The accuracy of the
measurements shall be 0,1 mm. The average of the four individual measurements are respective the
length, L, and width, W, of the slab.
The thickness, T, of the slab shall be determined at eight points. Each point shall be taken 100 mm from
the edge of the slab using a vernier calliper. All eight point shall be equally divided over the surface of
the slab. The accuracy of each measurement shall be 0,1 mm. The maximum difference between the
eight individual measurements shall be 2,5 mm. If not, the specimen shall not be tested. The average of
the eight measurements is the thickness, T, of the slab.
If cores are tested, the diameter and thickness of each core shall be determined according to
EN 12697-29 using a vernier calliper. The diameter, D, and the thickness, T, are measured at four
positions of the slab, equally divided over the area. The accuracy of the measurements shall be 0,1 mm.
The average of the four individual measurements shall be deemed to be the diameter of the core.
The bulk density of the slab or the core shall be determined according to EN 12697-6 using the bulk
density by dimensions procedure. Before measuring the mass, M , of the slab, the specimen shall be
0
dried to constant mass in air at a relative air humidity of less than 80 % at a temperature not more than
20 °C. A test specimen shall be considered to be dry after at least 8 h drying time and when two
weighings performed minimum 4 h apart differ by less than 0,1 %.
6 Loading devices
The resistance to scuffing can be determined using one of the following test devices:
— The ARTe (the Aachener Raveling Tester) see Annex A;
— The DSD (the Darmstadt Scuffing Device) see Annex B;
— The RSAT (the Rotating Surface Abrasion Test) see Annex C and
— The Triboroute see Annex D.
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7 Test results
The results of the tests shall be reported using the results of the visual inspection and/or pictures
before and after the test and the material loss per covered area (= MLpA). Alternatively, the increase in
texture per covered area, ΔV, can be used. The following formulae shall be used:
— Material loss per covered area MLpA when slabs are tested determine by
MM−
∆M
0,i 1,i
i
MLpA with i = 1,2 (1)
i
WL WL
i i i i
2
MLpA
i
∑
i=1
MLpA= (2)
2
where
M is the mass of the slab i (i = 1,2) before performing the test, in 1 g (grams);
0,i
M is the mass of the slab i (i = 1,2) after performing the test, in 1 g (grams);
1,i
W is the width of the slab i (i = 1,2) in 0,1 mm (millimeter);
i
L is the length of the slab i (i = 1,2) in 0,1 mm (millimeter.
i
— Material loss per covered area MLpA when a (set of) cores are tested determine
MM−
∆M
0,i 1,i
i
with i = 1,2 (3)
MLpA
i
11
22
ppDD
i i
44
2
MLpA
∑ i
i=1
(4)
MLpA=
2
where
M is the mass of the (set of) core i (i = 1,2) before performing the test, in 1 g (grams);
0,i
M is the mass of the (set of) core i (i = 1,2) after performing the test, in 1 g (grams);
1,i
D is the diameter of the (set of) core i (i = 1,2) in 0,1 mm (millimetre).
i
— Increase in texture ΔV per covered area using 3D laser measurements when using slabs or (a set of)
cores determine
VV−
1,i 0,i
∆=V with i = 1,2 (5)
i
WL
i i
2
∆V
∑ i
i=1
∆V= (6)
2
where
V is the volume of the texture of the slab or (a set of) cores i (I = 1, 2) before performing the test, in
0,i
9
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3
0,1 mm (cubic millimetre);
V is the volume of the texture of the slab or (a set of) cores i (I = 1, 2) after performing the test, in
1,i
3
0,1 mm (cubic millimetre);
W is the width of the slab or (a set of) cores i (I = 1, 2) in 0,1 mm (millimetre);
i
L is the length of the slab or (a set of) cores i (I = 1, 2) in 0,1 mm (millimetre).
i
— Increase in texture ΔV per covered area using 3D laser measurements when using (a set of) cores
determine
VV−
1,i 0,i
∆V= with i = 1,2 (7)
i
1
2
pD
i
4
2
∆V
∑ i
i=1
∆V= (8)
2
where
V 3
0,i is the volume of the texture of (a set of) cores i (I = 1, 2) before performing the test, in 0,1 mm (cubic
millimetre);
V 3
1,i is the volume of the texture of (a set of) cores i (I = 1, 2) after performing the test, in 0,1 mm (cubic
millimetre);
D is the diameter of (a set of) cores i (i = 1,2) in 0,1 mm (millimetre).
i
NOTE Sometimes a substantial part of the scuffing occurs close to the edges of the slab or the core. This
phenomenon especially occurs when course graded porous asphalt specimens are tested. In this situation, the
increase in volume can be determined for a smaller area of the slab or core. If, for example, a slab of 500 mm by
500 mm shows excessive scuffing close to the edges, ΔV can be determined over an area of 400 mm by 400 mm,
skipping the material loss which occurs in the outer strip with a width of 50 mm of the slab. It is essential to
mention the considered area in the report.
8 Test report
8.1 General
The test report shall contain not less than the following information:
a) name of organisation carrying out the test;
b) date of the test;
c) reference to this test method and test conditions;
d) characterization and the origin (lab compacted slabs or cut from a pavement) of the tested
material;
e) short description of the test facility.
For each specimen tested, report:
f) length, width and thickness of the tested slab, expressed to the nearest 0,1 mm;
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g) results of the visual inspection of the surface of the slab before and after the test;
h) mass of the slab before, M , and after the test, M , expressed to the nearest 1 grams;
0,I 1,i
2
i) material loss per covered area MLpA , expressed to the nearest 1 g/mm ;
i
j) if available, the volume of the texture of the surface of the slab before, V and after, V , the test in
0,i 1,I
3
0,1 mm ;
3
k) if available, the change in volume of the texture of the surface of the slab, ΔV , in 0,1 mm .
i
As an average of the two tested slabs per asphalt mixture:
l) general conclusion about material loss, based on the results of the visual inspection of both slabs;
2
m) average material loss per covered area, MLpA, expressed to the nearest 1 g/mm ;
3
n) if available, the average change in volume of the texture of the surface of the slab, ΔV, in 0,1 mm .
8.2 Precision
8.2.1 Repeatability
Currently, repeatability data are not yet available.
8.2.2 Reproducibility
The reproducibility for this test method has not been determined.
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Annex A
(normative)

The ARTe
A.1 Equipment
A.1.1 General
In order to create high shear stresses on the surface of an asphalt slab, a special scuffing device shall be
used. In this scuffing device, the slab is fixed in a slab fixation box and is moving forwards and
backwards. This movement shall be created by mounting the slab and the slab fixation box on a lateral
moving table, which is travelling for- and back-wards. During this movement, a set of two wheel tyres
shall rotate over the loading table a
...