SIST-TS CEN/TS 12697-51:2025
(Main)Bituminous mixtures - Test methods - Part 51: Surface shear strength test
Bituminous mixtures - Test methods - Part 51: Surface shear strength test
This document (FprCEN/TS 12697-51:2024) specifies a test method for measuring the surface shear strength for airfield surface courses.
The surface shear strength will depend on the depth of the surface course together with the properties of the surface course material.
The binder course material and any bonding agent applied between the two layers can have an influence on the test result for, in particular, ultra-thin surface course.
Asphalt - Prüfverfahren - Teil 51: Scherfestigkeitsprüfung für Asphaltdecken
Dieses Dokument (FprCEN/TS 12697-51:2024) legt ein Prüfverfahren für die Messung der Scherfestigkeit von Asphaltdecken auf Flugplätzen fest.
Die Scherfestigkeit hängt von der Dicke (Tiefe) der Fahrbahndeckschicht sowie von den Eigenschaften der verwendeten Straßenbaustoffe ab.
Besonders für sehr dünne Asphaltdeckschichten können die Prüfergebnisse durch das für die Binderschicht verwendete Material und den zwischen den beiden Schichten verwendeten Haftkleber beeinflusst werden.
Mélanges bitumineux - Méthodes d'essai - Partie 51 : Essai de résistance de liaison au cisaillement
Bitumenske zmesi - Preskusne metode - 51. del: Preskus strižne trdnosti površine
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-maj-2025
Nadomešča:
SIST-TS CEN/TS 12697-51:2017
Bitumenske zmesi - Preskusne metode - 51. del: Preskus strižne trdnosti površine
Bituminous mixtures - Test methods - Part 51: Surface shear strength test
Asphalt - Prüfverfahren - Teil 51: Scherfestigkeitsprüfung für Asphaltdecken
Mélanges bitumineux - Méthodes d'essai - Partie 51 : Essai de résistance de liaison au
cisaillement
Ta slovenski standard je istoveten z: CEN/TS 12697-51:2025
ICS:
93.080.20 Materiali za gradnjo cest Road construction materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN/TS 12697-51
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
March 2025
TECHNISCHE SPEZIFIKATION
ICS 93.080.20 Supersedes CEN/TS 12697-51:2017
English Version
Bituminous mixtures - Test methods - Part 51: Surface
shear strength test
Mélanges bitumineux - Méthodes d'essai - Partie 51 : Asphalt - Prüfverfahren - Teil 51:
Essai de résistance de liaison au cisaillement Scherfestigkeitsprüfung für Asphaltdecken
This Technical Specification (CEN/TS) was approved by CEN on 10 February 2025 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 12697-51:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Principle . 7
5 Apparatus . 7
6 Materials . 7
7 Procedure . 8
7.1 Site . 8
7.2 In situ procedure . 8
7.3 Laboratory procedure . 8
7.4 Conditioning procedure . 10
8 Calculation and expression of results . 10
9 Test report . 10
10 Precision . 11
Annex A (informative) Examples of typical failure modes. 12
Annex B (informative) Examples of correction for temperatures . 13
Bibliography . 15
European foreword
This document (CEN/TS 12697-51:2025) has been prepared by Technical Committee CEN/TC 227 “Road
materials”, the secretariat of which is held by BSI.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes CEN/TS 12697-51:2017.
CEN/TS 12697-51:2017:
— [ge] contradictory NOTES deleted or reworded to normal text;
— [Introduction] new Clause with general description of test. Explanatory NOTE added regarding
comparison with EN 12697-48;
— [2] clarification of Scope. NOTE deleted and placed as normal text in Introduction;
— [5.3] deletion of temperature range for thermometer;
— [5.3] “accuracy” amended to “maximum permissible error”;
— [5.6] “accuracy” amended to “maximum permissible error”;
— [5.8] “accuracy” amended to “maximum permissible error”;
— [6.1] NOTE explaining rapid setting epoxy resins deleted and reworded to normal text to include also
polyester resins for use as adhesives;
— [7.2.2] NOTE deleted;
— [7.2.3] clarified description of drilled hole for temperature measurement;
— [7.2.3] deletion of target temperature for the test. Range of 20 °C to 35°C for test introduced;
— [7.2.3] added reference to Annex A with examples of typical failure modes;
— [7.2.6] paragraph reworded in line with 7.3.13. Introduction of reference to Annex A;
— [7.3.2] paragraph 3 deleted as this test method is not called up in EN 13108-20 Type Testing-
Paragraph 4 deleted as reinstating the core holes is out of the Scope;
— [7.3.5] corrected reference to 7.3.3;
— [8.3] deletion of Figure 1 including keys and NOTE. Added reference to new Annex B;
— [9] update of the contents in the test report;
— [Annex A] paragraph amended to include a failure mode for surfacing of a bituminous mixture. NOTE
deleted as described in 7.2.6 and 7.3.13;
— [Annex A] Figure A.1 amended to illustrate a failure mode for surfacing of a bituminous mixture.
Photographs illustrating failure mode for Slurry Surfacing deleted as Slurry Surfacing is out of the
Scope for this test method.
— [Annex B] introduction of new Annex with examples of correction for temperature;
— [Bibliography] introduced with reference to EN 12697-48.
A list of all parts in the EN 12697 series can be found on the CEN website.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN/CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Introduction
This test method was designed for use on airfield runways and taxiways. The main purpose of the test is
to measure the robustness of asphalt surface courses against shearing.
NOTE EN 12697-48 includes an on-site torque bond test that uses the same test equipment. However, in this
case the surface is cored to expose the interface to be tested. The torque applied to the top of unremoved core
induces twisting shear failure at the interface only.
1 Scope
This document (CEN/TS 12697-51:2025) specifies a test method for measuring the surface shear
strength for airfield surface courses.
The surface shear strength will depend on the depth of the surface course together with the properties
of the surface course material.
The binder course material and any bonding agent applied between the two layers can have an influence
on the test result for, in particular, ultra-thin surface course.
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.
EN 12697-27, Bituminous mixtures — Test methods — Part 27: Sampling
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
surface shear strength
torsional strength around the circumference of loading within the surface course and, possibly, a
combination of the rotational shear strength between layers of an asphalt pavement and the torsional
strength around the circumference of loading within the binder course
Note 1 to entry: The surface shear strength will depend on the thickness of the surface course together with the
properties of the surface course material, the binder course material and any bonding agent applied between the
two layers.
Note 2 to entry: The depth of the surface course will determine the extent to which the test measures the rotational
shear strength between layers of an asphalt pavement or the torsional strength around the circumference of loading
within the surface course. The greater the thickness, the less the test will measure rotational shear strength between
layers.
Note 3 to entry: If the thickness of the surface course is shallow and the torsional strength of the binder course is
less than that of the surface course, the failure plane could go through the binder course.
3.2
surface course
top layer of an asphalt pavement
3.3
binder course
layer below the surface course, irrespective of whether it was originally intended to be the binder course
and whether or not it is an asphalt layer
4 Principle
A 100 mm diameter plate is bonded to the surface course and rotated using a torque meter to determine
the torsional strength of the top layer and, in the case of ultra-thin surface courses, the rotational shear
strength between layers. The test can be carried out either in situ or in the laboratory using a nominal
200 mm diameter core which may be subjected to curing conditions. The in situ test is done without the
necessity to core into the substrate. A curing procedure can be used to assess the effect of moisture in the
development of surface shear strength with time.
5 Apparatus
5.1 Torque meter, fitted with a reading gauge that indicates the maximum torque obtained. The device
shall be calibrated over a range of 0 Nm to 400 Nm with a scale accurate and readable to at least 10 Nm.
The device shall be fitted with a socket fitting allowing steel plates to be fitted and removed.
5.2 Metal plates, each having a diameter of (95 ± 5) mm and a thickness of (14 ± 2) mm. The plate shall
incorporate a fitting enabling it to be couples to the torque meter.
NOTE 1 Mild steel has been found suitable for the plate.
NOTE 2 Fittings of 12,7 mm and 19,05 mm have been found to be suitable for the fitting.
5.3 Thermometer, readable to 0,1 °C and with a maximum permissible error of 0,5 °C.
5.4 Steel rule, readable to 1 mm.
5.5 Callipers, for measurement of the diameter of the metal plate, if necessary.
5.6 Watch or timer, readable to 1 s and with a maximum permissible error of 1 s .
5.7 Adaptors and extension rods (optional).
5.8 Core cutting apparatus, suitable for cutting 200 mm diameter cores (laboratory testing only).
5.9 Mould, for confining specimens (laboratory testing only).
5.10 Spirit level (laboratory testing only).
5.11 Oven or refrigerated incubator (laboratory testing and conditioning procedure only).
5.12 Water bath of suitable size to accommodate at least one specimen and thermostatically controlled
such that a temperature of (20 ± 0,5) °C can be maintained (conditioning procedure only).
6 Materials
6.1 Adhesive of sufficient stiffness to avoid failure within the adhesive or at the interfaces between the
adhesive and the asphalt layers.
Rapid-setting epoxy resins or polyester resins can be used as an adhesive.
6.2 Mounting material, such as rapid-hardening mortar, concrete or grout (laboratory
...
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