Bituminen and Bituminous Binders - Multiple Stress Creep and Recovery Test (MSCRT)

1.1   This test method covers the determination of percent recovery and non-recoverable creep compliance of bitumen and bituminous binders by means of Multiple Stress Creep and Recovery (MSCR) testing. The MSCR test is conducted using the Dynamic Shear Rheometer (DSR) in creep mode at a specified temperature.
1.2   This standard is appropriate for unaged material, material aged in accordance with EN 12607-1 (RTFOT), material aged in accordance with EN 14769 (PAV), material aged in accordance with both EN 12607-1 and EN 14769.
Other ageing methods, for example EN 15323 (RCAT) can also be used to produce material for this standard.
1.3   The percent recovery at multiple stress levels is intended to determine the presence of elastic response and stress dependence of bituminous binders.
1.4   The non-recoverable creep compliance at multiple stress levels is intended as an indicator for the sensitivity to permanent deformation and stress dependence of bituminous binders.
1.5   This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Bitumen und bitumenhaltige Bindemittel - MSCR-Prüfung (Multiple Stress Creep and Recovery Test)

1.1   Dieses Prüfverfahren ermöglicht die Bestimmung der prozentualen Erholung und des nicht rückformbaren Anteils von Bitumen und bitumenhaltigen Bindemitteln mittels der MSCR-Prüfung (Multiple Stress Creep and Recovery Testing). Die MSCR-Prüfung wird bei einer festgelegten Temperatur mit Hilfe des Dynamischen Scherrheometers (DSR) in der Betriebsart „Kriechen“ durchgeführt.
1.2   Diese Norm ist anwendbar für nicht gealterte, für nach EN 12607 1 (RTFOT) oder EN 14769 (PAV) gealterte sowie für nach EN 12607 1 und anschließend nach EN 14769 gealterte Prüfmaterialien.
Für die Herstellung von Prüfmaterialien für die Prüfung nach der vorliegenden Norm dürfen auch andere Alterungsverfahren, z. B. EN 15323 (RCAT), angewendet werden.
1.3   Die prozentuale Erholung bei unterschiedlichen Spannungsniveaus dient zur Bestimmung des Vorhandenseins einer elastischen Reaktion und deren Spannungsabhängigkeit von bitumenhaltigen Bindemitteln.
1.4   Der nicht rückformbare Anteil bei unterschiedlichen Spannungsniveaus dient als Anzeiger für die Anfälligkeit des bitumenhaltigen Bindemittels für bleibende Verformungen und für deren Spannungs-abhängigkeit.
1.5   Diese Norm erhebt nicht den Anspruch, alle mit ihrer Anwendung verbundenen Sicherheitsprobleme anzusprechen. Es liegt in der Verantwortung des Anwenders dieser Norm, geeignete Verhaltensregeln für den Arbeits- und Gesundheitsschutz festzulegen und vor der Anwendung zu klären, ob einschränkende Vorschriften zu berücksichtigen sind.

Bitumes et liants bitumineux- Essai de fluage-recouvrance sous contraintes répétées

.1   La présente méthode d'essai permet la détermination du pourcentage de recouvrance et de la complaisance en fluage irréversible des bitumes et liants bitumineux au moyen de l'essai de fluage-recouvrance sous contraintes répétées (MSCRT). L'essai MSCR est réalisé à l'aide d'un rhéomètre à cisaillement dynamique (DSR – Dynamic Shear Rheometer) en mode fluage à une température spécifiée.
1.2   Le pourcentage de recouvrance à différents niveaux de contrainte est destiné à déterminer l’existence d’une réponse élastique et la dépendance en contraintes des liants bitumineux.
1.3   La complaisance en fluage irréversible à différents niveaux de contrainte est destinée à servir d'indicateur de sensibilité à la déformation permanente et à la dépendance en contraintes des liants bitumineux.
1.4   La présente Norme européenne n’est pas censée aborder tous les problèmes de sécurité concernés par son usage. Il est de la responsabilité de l'utilisateur de la présente Norme européenne d'établir des règles de sécurité et d'hygiène appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation.

Bitumen in bitumenska veziva - Ponavljajoči obremenilni in razbremenilni preskus lezenja (MSCRT)

1.1 Ta preskusna metoda zajema določevanje deleža ohranjene aktivnosti ter skladnosti nepovratnega lezenja bitumna in bitumenskih veziv s ponavljajočim obremenilnim in razbremenilnim preskusom lezenja (MSCR). Preskus MSCR se izvede z dinamičnim strižnim reometrom (DSR) v načinu lezenja pri določeni temperaturi.
1.2 Ta standard je primeren za nestaran material, staran material v skladu s standardom EN 12607-1 (RTFOT), staran material v skladu s standardom EN 14769 (PAV) ter staran material v skladu s standardoma EN 12607-1 in EN 14769.
Za proizvodnjo materiala za ta standard je mogoče uporabiti tudi druge metode staranja, na primer iz standarda EN 15323 (RCAT).
1.3 Delež ohranjene aktivnosti pri več stopnjah odpornosti je namenjen določevanju prisotnosti elastičnega odziva in odvisnosti na odpornost bitumenskih veziv.
1.4 Skladnost nepovratnega lezenja pri več stopnjah odpornosti označuje občutljivost na stalno deformacijo in odvisnosti na odpornost bitumenskih veziv.
1.5 Ta standard ne obravnava vseh morebitnih varnostnih težav, ki se nanašajo na njegovo uporabo. Za vzpostavitev ustreznih varnostnih in zdravstvenih praks ter za določitev uporabnosti regulativnih omejitev pred uporabo je odgovoren uporabnik tega standarda.

General Information

Status
Published
Public Enquiry End Date
09-Dec-2013
Publication Date
25-Feb-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Jan-2016
Due Date
11-Mar-2016
Completion Date
26-Feb-2016

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Bitumen und bitumenhaltige Bindemittel - MSCR-Prüfung (Multiple Stress Creep and Recovery Test)Bitumes et liants bitumineux- Essai de fluage-recouvrance sous contraintes répétéesBituminen and Bituminous Binders - Multiple Stress Creep and Recovery Test (MSCRT)91.100.50Veziva. Tesnilni materialiBinders. Sealing materials75.140Voski, bitumni in drugi naftni proizvodiWaxes, bituminous materials and other petroleum productsICS:Ta slovenski standard je istoveten z:EN 16659:2015SIST EN 16659:2016en,fr,de01-marec-2016SIST EN 16659:2016SLOVENSKI
STANDARD



SIST EN 16659:2016



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16659
December
t r s w ICS
y wä s v râ
{ sä s r rä w r English Version
Bitumen and Bituminous Binders æ Multiple Stress Creep Bitumes et liants bitumineuxæ Essai de fluageæ Bitumen und bitumenhaltige Bindemittel æ MSCRæThis European Standard was approved by CEN on
s x November
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x x w {ã t r s w ESIST EN 16659:2016



EN 16659:2015 (E) 2 Content
European foreword . 3 1 Scope . 4 2 Normative References . 4 3 Terms and definitions . 4 4 Principle . 5 5 Apparatus . 5 5.1 Dynamic Shear Rheometer (DSR) . 5 5.2 Moulds or sheet materials . 5 5.3 Oven . 5 6 Preparation of rheometers . 6 6.1 Set up . 6 6.2 Zero gap setting . 6 7 Sample preparation . 6 8 Procedure. 8 8.1 Sample placing onto the rheometer . 8 8.2 Gap setting . 8 8.3 Testing . 8 9 Calculations . 9 10 Expression of Results . 9 11 Precision . 10 11.1 General . 10 11.2 Repeatability, r . 11 11.3 Reproducibility, R . 11 12 Report . 11
SIST EN 16659:2016



EN 16659:2015 (E) 3 European foreword This document (EN 16659:2015) has been prepared by Technical Committee CEN/TC 336 “Bituminous binders”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. 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 organisations of the following countries are bound to implement this European Standard: 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. SIST EN 16659:2016



EN 16659:2015 (E) 4 1 Scope 1.1 This test method covers the determination of percent recovery and non-recoverable creep compliance of bitumen and bituminous binders by means of Multiple Stress Creep and Recovery (MSCR) testing. The MSCR test is conducted using the Dynamic Shear Rheometer (DSR) in creep mode at a specified temperature. 1.2 The percent recovery at multiple stress levels is intended to determine the presence of elastic response and stress dependence of bituminous binders. 1.3 The non-recoverable creep compliance at multiple stress levels is intended as an indicator for the sensitivity to permanent deformation and stress dependence of bituminous binders. 1.4 This European Standard does not purport to address all of the safety concerns, if any, 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. 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 58, Bitumen and bituminous binders - Sampling bituminous binders EN 12594, Bitumen and bituminous binders - Preparation of test samples EN 12597, Bitumen and bituminous binders - Terminology EN 14770, Bitumen and bituminous binders - Determination of complex shear modulus and phase angle - Dynamic Shear Rheometer (DSR) ISO 5725-2:1994, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12597 and the following apply. 3.1 creep and recovery standard rheological test protocol whereby a specimen is subjected to a constant load for a fixed time period, then allowed to recover, at zero load, for a fixed time period 3.2 percent recovery (%R) recovered strain in a specimen during the recovery portion of a cycle, expressed in percent SIST EN 16659:2016



EN 16659:2015 (E) 5 3.3 non-recoverable creep compliance (Jnr) residual strain in a specimen after a creep and recovery cycle divided by the stress applied 4 Principle This test method is used to determine the presence of elastic response in bitumen and bituminous binders under shear creep and recovery at two stress levels at a specified temperature. The presence of this elastic response is determined by measuring the percent recovery and non-recoverable compliance of the binder. Non-recoverable creep compliance has been shown to be an indicator of the resistance of bitumen and bituminous binders to permanent deformation under repeated load. The test shall be conducted at 50 °C, 60 °C, 70 °C or 80 °C as appropriate. Other test temperatures may be used for comparative purposes. Sample preparation and apparatus are in accordance with EN 14770 using the 25 mm parallel plate geometry with a 1 mm gap setting. The sample is loaded at constant stress for 1 s, then allowed to recover for 9 s. Ten creep and recovery cycles are run at 0,100 kPa creep stress followed by 10 more cycles at 3,200 kPa creep stress (see Figure 1). 5 Apparatus Usual laboratory apparatus and glassware, together with the following: 5.1 Dynamic Shear Rheometer (DSR) With either an integral temperature control system or temperature control attachments, capable of controlling the temperature over a minimum range of 5°C to 85°C with an accuracy of ± 0,1 °C throughout the test period. The rheometer shall be fitted with parallel plates, with a constant gap across the area of the plates. The temperature control system shall encompass both plates, to avoid temperature gradients across the plates. When the test specimen is immersed in liquid other than water, ensure that the liquid does not affect the properties of the material being analysed. The rheometer shall run in stress controlled mode and be able to collect data samples every 0,1 s. For rheometers using an air bearing, and to avoid damage, the air supply to the bearing should be switched on before the instrument is switched on. When not in use, the spindle should be secured. Where the bottom plate is nominally the same diameter as the top plate, then a visual check should be made to ensure the two plates are vertically aligned. If there is any doubt as to the alignment of the top and bottom plates, then the manufacturer, or a qualified technician, should re-align the plate geometry. 5.2 Moulds or sheet materials For the preparation of the test specimens, the moulds or sheet material shall be of silicone or similar material, which does not adhere to the test specimen. The use of greases or other anti-stick products is not allowed because they can affect the adherence of the sample to the rheometer plates. 5.3 Oven Ventilated laboratory model, capable of being controlled at temperatures between 50 °C and 200 °C with an accuracy of ± 5 °C. SIST EN 16659:2016



EN 16659:2015 (E) 6 6 Preparation of rheometers 6.1 Set up Set up the rheometer in the sequence given in the manu
...

SLOVENSKI STANDARD
oSIST prEN 16659:2013
01-november-2013
%LWXPHQLQELWXPHQVNDYH]LYD3RQDYOMDMRþLREUHPHQLOQLLQUD]EUHPHQLOQLSUHVNXV
OH]HQMD 06&57
Bituminen and Bituminous Binders - Multiple Stress Creep and Recovery Test (MSCRT)
Bitumen und bitumenhaltige Bindemittel - MSCR-Prüfung (Multiple Stress Creep and
Recovery Test)
Bitumes et liants bitumineux- Essai de fluage-recouvrance sous contraintes répétées
Ta slovenski standard je istoveten z: prEN 16659
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
oSIST prEN 16659:2013 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 16659:2013

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oSIST prEN 16659:2013


EUROPEAN STANDARD
DRAFT
prEN 16659
NORME EUROPÉENNE

EUROPÄISCHE NORM

August 2013
ICS 75.140; 91.100.50
English Version
Bituminen and Bituminous Binders - Multiple Stress Creep and
Recovery Test (MSCRT)
Bitumes et liants bitumineux- Essai de fluage-recouvrance Bitumen und bitumenhaltige Bindemittel - MSCR-Prüfung
sous contraintes répétées (Multiple Stress Creep and Recovery Test)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 336.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, 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.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16659:2013: E
worldwide for CEN national Members.

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oSIST prEN 16659:2013
prEN 16659:2013 (E)
Contents
Page
Foreword .3
1 Scope .3
2 Normative References .3
3 Terms and definitions .4
4 Principle .4
5 Apparatus .4
6 Preparation of rheometers .5
7 Sample preparation .5
8 Procedure .7
9 Expression of results .8
10 Precision .9
11 Report . 10

2

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oSIST prEN 16659:2013
prEN 16659:2013 (E)
Foreword
This document (prEN 16659:2013) has been prepared by Technical Committee CEN/TC 336 “Bituminous
binders”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
1 Scope
1.1 This test method covers the determination of percent recovery and non-recoverable creep compliance of
bitumen and bituminous binders by means of Multiple Stress Creep and Recovery (MSCR) testing. The
MSCR test is conducted using the Dynamic Shear Rheometer (DSR) in creep mode at a specified
temperature.
1.2 This standard is appropriate for unaged material, material aged in accordance with EN 12607-1 (RTFOT),
material aged in accordance with EN 14769 (PAV), material aged in accordance with both EN 12607-1 and
EN 14769.
Other ageing methods, for example EN 15323 (RCAT) can also be used to produce material for this standard.
1.3 The percent recovery at multiple stress levels is intended to determine the presence of elastic response
and stress dependence of bituminous binders.
1.4 The non-recoverable creep compliance at multiple stress levels is intended as an indicator for the
sensitivity to permanent deformation and stress dependence of bituminous binders.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is
the responsibility of the user of this standard to establish appropriate safety and health practices and
determine the applicability of regulatory limitations prior to use.
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.
2.1 ASTM Standards:
ASTM D7405-10a, Standard Test Method for Multiple Stress Creep and Recovery (MSCR) of Asphalt Binder
Using a Dynamic Shear Rheometer
2.2 AASHTO Standards
AASHTO TP 70-10, Standard Method of Test for Multiple Stress Creep Recovery (MSCR) Test of Asphalt
Binder Using a Dynamic Shear Rheometer (DSR)
M320 Specifications for performance graded asphalt binder
2.3 EN Standards
EN 58, Bitumen and bituminous binders – Sampling bituminous binders.
EN 12594, Bitumen and bituminous binders – Preparation of test samples.
EN 12597, Bitumen and bituminous binders – Terminology.
3

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oSIST prEN 16659:2013
prEN 16659:2013 (E)
EN12607-1, Bitumen and bituminous binders - Determination of the resistance to hardening under the
influence of heat and air. Part 1 – RTFOT
EN 14769, Bitumen and bituminous binders - Accelerated long-term ageing conditioning by a Pressure Ageing
Vessel (PAV).
EN 15323, Bitumen and bituminous binders - Accelerated long-term ageing/conditioning by the rotating
cylinder method (RCAT)
EN 14770, Bitumen and bituminous binders - Determination of complex shear modulus and phase angle -
Dynamic Shear Rheometer (DSR).
EN ISO 4259, Petroleum products. Determination and application of precision data in relation to methods of
test.(ISO 4259)
3 Terms and definitions
For definitions of general terms used in this standard, refer to EN 12597.
3.1 creep and recovery
a standard rheological test protocol whereby a specimen is subjected to a constant load for a fixed time
period, then allowed to recover, at zero load, for a fixed time period.
3.2 percent recovery (%R)
the recovered strain in a specimen during the recovery portion of a cycle, expressed in percent.
3.3 non-recoverable creep compliance (J )
nr
the residual strain in a specimen after a creep and recovery cycle divided by the stress applied.
4 Principle
This test method is used to determine the presence of elastic response in bitumen and bituminous binders
under shear creep and recovery at two stress levels at a specified temperature. The presence of this elastic
response is determined by measuring the percent recovery and non-recoverable compliance of the binder.
Non-recoverable creep compliance has been shown to be an indicator of the resistance of bitumen and
bituminous binders to permanent deformation under repeated load.
The test shall be conducted at 40, 50, 60 or 70°C as appropriate. Other test temperatures may be used for
comparative purposes. Sample preparation and apparatus are in accordance with EN 14770 using the 25 mm
parallel plate geometry with a 1 mm gap setting.
The sample is loaded at constant stress for 1 s, then allowed to recover for 9 s. Ten creep and recovery
cycles are run at 0,100 kPa creep stress followed by ten more cycles at 3,200 kPa creep stress (see Figure
1).
5 Apparatus
Usual laboratory apparatus and glassware, together with the following:
5.1 Dynamic Shear Rheometer (DSR),
with either an integral temperature control system or temperature control attachments, capable of controlling
the temperature over a minimum range of 5°C to 85°C with an accuracy of ± 0,1°C throughout the test period.
The rheometer shall be fitted with parallel plates, with a constant gap across the area of the plates. The
temperature control system shall encompass both plates, to avoid temperature gradients across the plates.
Where the test specimen is immersed in liquid other than water, ensure that the liquid does not affect the
properties of the material being analysed. The rheometer shall run in stress control mode and be able to
collect data samples every 0.1 seconds.
NOTE 1 For rheometers using an air bearing, and to avoid damage, the air supply to the bearing should be switched
on before the instrument is switched on. When not in use, the spindle should be secured.
4

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oSIST prEN 16659:2013
prEN 16659:2013 (E)
NOTE 2 Where the bottom plate is nominally the same diameter as the top plate, then a visual check should be made
to ensure the two plates are vertically aligned. If there is any doubt as to the alignment of the top and bottom plates, then
the manufacturer, or a qualified technician, should re-align the plate geometry.
5.2 Moulds or sheet materials.
For the preparation of the test specimens, the moulds or sheet material shall be of silicone or similar material,
which does not adhere to the test specimen.
NOTE: The use of greases or other anti-stick products should be avoided because they can affect the adherence of
the sample to the rheometer plates.
5.3 Oven.
Ventilated laboratory model capable of being controlled at temperatures between 50°C and 200°C with an
accuracy of ± 5°C.
6 Preparation of rheometers
6.1 Set up
Set up the rheometer in the sequence given in the manufacturer's instructions using 25 mm parallel plates and
a 1 mm gap.
NOTE : The rheometer and temperature control system shall be calibrated at regular intervals in accordance with the
quality assurance procedure of the laboratory. A suitable method is that the rheometer and temperature control system are
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.
6.2 Zero gap setting
Carefully prepare the rheometer plates for receipt of the test specimen, by cleaning with a suitable solvent and
soft cleaning cloth or paper. Do not use metal
...

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