EN 12697-26:2018+A1:2022

Bituminous mixtures - Test methods - Part 26: Stiffness

This European Standard specifies the methods for characterizing the stiffness of bituminous mixtures by alternative tests, including bending tests and direct and indirect tensile tests. The tests are performed on compacted bituminous material under a sinusoidal loading or other controlled loading, using different types of specimens and supports.
The procedure is used to rank bituminous mixtures on the basis of stiffness, as a guide to relative performance in the pavement, to obtain data for estimating the structural behaviour in the road and to judge test data according to specifications for bituminous mixtures.
As this standard does not impose a particular type of testing device the precise choice of the test conditions depends on the operating scope and working range of the device used.
For the choice of specific test conditions, the requirements of the product standards for bituminous mixtures should be respected.
The applicability of this document is described in the product standards for bituminous mixtures.

Asphalt - Prüfverfahren - Teil 26: Steifigkeit

Mélanges bitumineux - Méthodes d'essai- Partie 26 : Rigidité

Bitumenske zmesi - Preskusne metode - 26. del: Togost (vključno z dopolnilom A1)

General Information

• Status: Published
• Publication Date: 25-Oct-2022
• ICS: 93.080.20 - Road construction materials
• Technical Committee: CEN/TC 227 - Road materials
• Drafting Committee: CEN/TC 227/WG 1 - Bituminous mixtures
• Ref Project: SIST EN 12697-26:2018+A1:2022 - Bituminous mixtures - Test methods - Part 26: Stiffness

Relations

• Merged From: EN 12697-26:2018 - Bituminous mixtures - Test methods - Part 26: Stiffness
• Effective Date: 18-Jan-2023
• Merged From: EN 12697-26:2018/prA1 - Bituminous mixtures - Test methods - Part 26: Stiffness
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2022
Bitumenske zmesi - Preskusne metode - 26. del: Togost (vključno z dopolnilom A1)
Bituminous mixtures - Test methods - Part 26: Stiffness
Asphalt - Prüfverfahren - Teil 26: Steifigkeit
Mélanges bitumineux - Méthodes d'essai- Partie 26 : Rigidité
Ta slovenski standard je istoveten z: EN 12697-26:2018+A1:2022
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.

EN 12697-26:2018+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2022
EUROPÄISCHE NORM
ICS 93.080.20 Supersedes EN 12697-26:2018
English Version
Bituminous mixtures - Test methods - Part 26: Stiffness
Mélanges bitumineux - Méthodes d'essai- Partie 26 : Asphalt - Prüfverfahren - Teil 26: Steifigkeit
Rigidité
This European Standard was approved by CEN on 26 February 2018 and includes Amendment 1 approved by CEN on 7
September 2022.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12697-26:2018+A1:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and symbols . 6
3.1 Terms and definitions . 6
3.2 Symbols . 8
4 Principle . 9
5 Sample preparation . 9
5.1 Age of the specimens . 9
5.2 Drying of the specimens . 9
5.3 Dimensions and bulk density of the specimens . 9
5.4 Number of test specimens . 10
6 Checking of the testing equipment . 10
7 Test methods . 10
7.1 General . 10
7.2 Codification of tests . 10
7.2.1 Sinusoidal bending tests . 10
7.2.2 lndirect tensile test (pulse or cyclic) . 11
7.2.3 Cyclic or monotonous uniaxial tests . 11
7.2.4 Loading conditions . 11
7.2.5 Load amplitudes . 11
7.2.6 Loading frequencies . 11
7.3 Controlled strain rate loading . 12
7.3.1 Test method . 12
7.3.2 Loading conditions . 12
7.3.3 Strain amplitudes for direct tensile tests . 12
8 Temperatures . 13
9 Expression of results . 13
10 Test report . 15
10.1 Introduction . 15
10.2 General . 15
10.3 Information on specimens . 15
10.4 Information on test method . 15
10.5 Information on the test and results . 16
10.6 Optional information . 16
11 Precision . 16
Annex A (normative) Two point bending test on trapezoidal specimens (2PB-TR) or on
prismatic specimens (2PB-PR) . 17
A.1 Principle . 17
A.2 Equipment . 17
A.3 Specimen preparation . 18
A.4 Procedure . 19
Annex B (normative) Three point bending test on prismatic specimens (3PB-PR) and four
point bending test on prismatic specimens (4PB-PR). 20
B.1 Principle . 20
B.2 Equipment . 21
B.3 Specimen preparation . 22
B.3.1 Dimensions . 22
B.3.2 Sample manufacture . 22
B.4 Procedure . 23
Annex C (normative) Test applying indirect tension to cylindrical specimens (IT-CY) . 24
C.1 Principle . 24
C.2 Equipment . 24
C.2.1 General devices . 24
C.2.2 Test equipment . 24
C.3 Specimen preparation . 29
C.4 Mode of operation . 30
C.4.1 Mounting the specimen . 30
C.4.2 Stiffness measurement . 30
C.4.2.1 Conditioning load pulses . 30
C.4.2.2 Deformation measuring . 30
C.4.2.3 Calculation of the stiffness modulus . 30
C.4.2.4 Stiffness modulus of the specimen . 31
Annex D (normative) Direct tension-compression test on cylindrical specimens (DTC-CY) . 32
D.1 Principle . 32
D.2 Equipment . 32
D.3 Specimen preparation . 32
D.4 Mode of operation . 34
D.4.1 Stabilizing the specimen . 34
D.4.2 Procedure . 34
Annex E (normative) Test applying direct tension to cylindrical specimens (DT-CY) or to
prismatic specimens (DT-PR) . 35
E.1 Principle . 35
E.2 Equipment . 35
E.3 Specimen preparation . 35
E.3.1 Cylindrical specimen . 35
E.3.2 Prismatic specimen .
...