CEN/TS 15325:2008

SLOVENSKI STANDARD
01-april-2008
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Bitumen and bituminous binders - Determination of Zero-Shear Viscosity (ZSV) using a
Shear Stress Rheometer in creep mode
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Null-Scherviskosität (ZSV) mit
Hilfe eines Schubspannungs-Rheometers im Kriechmodus
Bitumes et liants bitumineux - Détermination de la viscosité a taux de cisaillement nul
(ZSV) utilisant un rhéometre a contrainte de cisaillement en mode de fluage
Ta slovenski standard je istoveten z: CEN/TS 15325:2008
ICS:
75.140 Voski, bitumni in drugi naftni Waxes, bituminous materials
proizvodi and other petroleum products
91.100.50 Veziva. Tesnilni materiali Binders. Sealing materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 15325
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
January 2008
ICS 91.100.50
English Version
Bitumen and bituminous binders - Determination of Zero-Shear
Viscosity (ZSV) using a Shear Stress Rheometer in creep mode
Bitumes et liants bitumineux - Détermination de la viscosité Bitumen und bitumenhaltige Bindemittel - Bestimmung der
à taux de cisaillement nul (ZSV) utilisant un rhéomètre à Null-Scherviskosität (ZSV) mit Hilfe eines
contrainte de cisaillement en mode de fluage Schubspannungs-Rheometers im Kriechmodus
This Technical Specification (CEN/TS) was approved by CEN on 23 March 2007 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, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15325:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope.4
2 Normative references.4
3 Terms and definitions .4
4 Apparatus.5
5 Specimen preparation.6
6 Test execution.7
7 Expression of results.9
8 Precision.9
9 Test report.10
Annex A (informative) Temperature verification procedure .15
Bibliography .16

Foreword
This document (CEN/TS 15325:2008) has been prepared by Technical Committee CEN/TC 336 “Bituminous
binders”, the secretariat of which is held by AFNOR.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

1 Scope
This European standard describes the determination of Zero Shear Viscosity (ZSV), η , for bitumens and
o
bituminous binders, preferably using test temperature domains in which 100 Pa.s < η < 50 000 Pa.s. The
o
preferred test temperature is 60 °C but other temperatures for example, 45 °C or 50 °C could be used.
Under these conditions, ZSV (also referred to as the first Newtonian viscosity or absolute viscosity) is a
suitable indicator to evaluate the partial contribution of the bituminous binder (including Polymer Modified
Binders) to the rutting resistance of asphalt pavement layers.
This European standard describes the determination of ZSV using a Shear Stress Rheometer (SSR) in creep
mode.
This method is applicable to unaged, aged and recovered bituminous binders including Polymer Modified
Binders (PMBs).
WARNING — Use of this European standard can involve hazardous materials, operations and
equipment. This European standard does not purport to address all of the safety problems associated
with its use. It is the responsibility of the user of this European standard to establish appropriate
safety and health practices and determine the applicability of regulatory limitations prior to use. Since
this European standard involves handling apparatus and binders at high temperatures, always wear
protective gloves and eye glasses when handling hot binder, and avoid contact with any exposed skin.
2 Normative references
The following referenced European standards are indispensable for the application of this European standard.
For dated references, only the edition cited applies. For undated references, the latest edition of the
referenced European standard (including any amendments) applies.
EN 12594, Bitumen and bituminous binders — Preparation of test samples
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
creep test
rheological test in which constant stress is applied to a sample and the resulting deformation is then measured
as a function of loading time
3.2
steady-state flow
state at which the rate of deformation reaches a constant value
3.3
steady-state viscosity (SSV)
ratio of the applied stress to the deformation rate under steady-state flow, in Pascal.seconds (Pa.s)
3.4
zero-shear viscosity (ZSV) or Newtonian dynamic viscosity (ηηηη )
constant value to which the SSV tends at low shear stress or shear rate values, measured in Pascal.seconds
(Pa.s)
3.5
compliance (J)
-1 -1
ratio of a component of strain to a component of stress, in Pascal (Pa )
4 Apparatus
4.1 Small tools
 Spatula or any tool that can be used to trim the sample.
 Moulds and vials, for preparing the test specimens. The moulds, where used, shall be silicone or similar
material which does not adhere to the test specimen. Vials, where used, shall be glass with a nominal
capacity of 10 ml.
4.2 Oven, ventilated laboratory model, capable of being controlled between 50 °C and 200 °C with an
accuracy of ± 5 °C.
4.3 Controlled-stress rheometer with temperature control
 rheometer that applies a constant stress to the specimen. It provides torsional or direct shear stress,
depending on the specimen shape.
NOTE 1 Usually a microcomputer is connected to the rheometer for data acquisition and processing.
 temperature controller capable of maintaining a temperature in and around the specimen within ± 0,1 °C
throughout the test period. The test temperature range depends on the controller and needs to include
the operating temperature, generally 60 °C.
The rheometer and temperature control system shall be calibrated at regular intervals in accordance with the
quality assurance procedure of the laboratory.
NOTE 2 A suitable method is that the rheometer and temperature control system is calibrated by a means traceable to
a national standard. Also, it is advisable to verify the accuracy of the temperature control system by means of a certified
temperature measuring device at regular intervals. Also note that external devices read the accurate temperature value
only if they are calibrated correctly. A temperature verification procedure is described in Annex A.
NOTE 3 The temperature in the test sample may differ from the temperature read by the device if insufficient
equilibration time is used.
4.4 Appropriate testing geometries
The parallel plate geometries are appropriate for all bituminous binders, with preferably a 25 mm diameter and
with a 1 mm gap.
NOTE 1 Plates of different diameters and gaps between 0,5 mm and 2 mm can also be used, provided compliance
effects of the instrument do not affect the results and the testing is carried out within the specified range of torque and
angular deformation and within the linear region.
NOTE 2 Use of parallel plate geometry improves the precision of test method.
In any case, for Polymer Modified Bitumens, the smallest dimension of the sample geometry, d, must satisfy
the following:
d > three times the size of the largest polymeric inclusions (usually, d > 1 mm).
NOTE The selection of system geometry may affect the accuracy of results. The manufacturer may have determined
the operational limits and this information may be available but, if not, it can be determined by running a test specimen
over a range of test temperatures using all the test geometries likely to be used in practice.
4.5 Zero-gap setting
Carefully prepare the rheometer plates to receive the test specimen by cleaning with a suitable solvent and
soft cleaning cloth or paper. Do not use metal or any other materials, which may damage the surfaces of the
plates, and take care not to bend the shaft of the upper plate.
Set the geometry temperature to the required test temperature and wait for thermal equilibrium (10 min to 30
min).
Apply the manufacturer’s procedure to reset the gap between the plates prior to loading the test specimen,
with both plates at nominally the same temperature.
5 Specimen preparation
5.1 Test specimen preparation
Prepare the binder in accordance with EN 12594.
Two methods can be used:
 specimen preparation in a mould followed by attachment to a test plate (preferred method);
 loading directly into the plate gap.
In the latter case, pour sufficient binder from the vial onto the test geometry for there to be an excess
appropriate to the measuring geometry chosen (proceed to sub-clause 5.2).
If using moulds, pour sufficient binder from the vial into the mould. To avoid successive sample heating,
several specimens should be prepared at this stage. Discard any binder remaining in the vial.
Store the covered moulds or sheet material at ambient temperature before testing. Any specimen not tested
within 7 days shall be discarded.
To minimise the effect of sample preparation, it is advised to pour the specimens 24 h before measuring.
Before testing, if necessary, place the specimens in a refrigerator (approximately 5 °C) to allow them to stiffen
for proper, deformation-free release from the moulds. To avoid physical hardening, it is recommended not to
leave the specimens in the cool chamber for longer than the time needed to obtain proper stiffness. The
recommended time is approximately 10 min and shall not exceed 30 min.
Release the samples from the moulds. Wipe away any release agent that may have been used.
Attach the specimens to the clean, dry test plate.
5.2 Setting the gap and trimming the sample
After the specimen has been placed on one of the test plates as described above, bring the test specimen to
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