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SLOVENSKI STANDARD
01-april-2023
Nadomešča:
SIST EN 12846-2:2011
Bitumen in bitumenska veziva - Določanje viskoznosti z iztočnim viskozimetrom -
2. del: Rezana in fluksirana bitumenska veziva
Bitumen and bituminous binders - Determination of efflux time by the efflux viscometer -
Part 2: Cut-back and fluxed bituminous binders
Bitumen und bitumenhaltige Bindemittel - Bestimmung der Ausflusszeit mittels
Ausflussviskosimeter - Teil 2: Verschnittene und gefluxte bitumenhaltige Bindemittel
Bitumes et liants bitumineux - Détermination du temps d'écoulement à l'aide d'un
viscosimètre à écoulement - Partie 2 : Bitumes fluidifés et fluxés
Ta slovenski standard je istoveten z: EN 12846-2:2022
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.
EN 12846-2
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2022
EUROPÄISCHE NORM
ICS 91.100.50 Supersedes EN 12846-2:2011
English Version
Bitumen and bituminous binders - Determination of efflux
time by the efflux viscometer - Part 2: Cut-back and fluxed
bituminous binders
Bitumes et liants bitumineux - Détermination du temps Bitumen und bitumenhaltige Bindemittel -
d'écoulement à l'aide d'un viscosimètre à écoulement - Bestimmung der Ausflusszeit mittels
Partie 2 : Bitumes fluidifiés et fluxés Ausflussviskosimeter - Teil 2: Verschnittene und
gefluxte bitumenhaltige Bindemittel
This European Standard was approved by CEN on 21 November 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 12846-2:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Principle . 5
5 Reagents and materials . 5
6 Apparatus . 5
7 Sampling . 6
8 Procedure. 6
8.1 General . 6
8.2 Preparation of apparatus . 6
8.3 Measurement . 7
9 Expression of results . 8
10 Precision . 8
10.1 Repeatability . 8
10.2 Reproducibility . 8
11 Test report . 9
Bibliography . 13
European foreword
This document (EN 12846-2:2022) 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 2023, and conflicting national standards shall be
withdrawn at the latest by June 2023.
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 EN 12846-2:2011.
— possibility to use a vegetal oil, requirement on density replaces requirement on viscosity (Clause 5);
— Figures 1 and 2 have been modified to be in line with the evolution of test equipment (6.1 and 6.2);
— possibility to use alternative working apparatus that meet the requirements of this document, such
as an integrated block viscometer (6.1);
— mercury stem thermometers are no longer specified as reference thermometers (6.4) and Annex A
has been removed;
— more accurate description of measurement procedure (8.3).
The EN 12846 series consists of the following parts under the general title Bitumen and bituminous
binders — Determination of efflux time by the efflux viscometer:
— Part 1: Bituminous emulsions;
— Part 2: Cut-back and fluxed bituminous binders.
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 implement this European Standard: 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.
1 Scope
This document specifies a method for the determination of the efflux time at 25 °C of petroleum cut-back
and fluxed bituminous binders in seconds using an efflux viscometer. Alternative test temperatures are
40 °C, 50 °C and 60 °C.
WARNING — The use of this document involves hazardous materials, operations and equipment. This
document does not purport to address all of the safety problems associated with its use. It is the
responsibility of the user of this document to establish appropriate safety and health practices and to
determine the applicability of regulatory limitations prior to use.
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 58, Bitumen and bituminous binders — Sampling bituminous binders
EN 12594, Bitumen and bituminous binders — Preparation of test samples
EN 13302, Bitumen and bituminous binders — Determination of dynamic viscosity of bituminous binder
using a rotating spindle apparatus
EN ISO 4788:2005, Laboratory glassware — Graduated measuring cylinders (ISO 4788:2005)
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
— IEC Electropedia: available at https://www.electropedia.org
3.1
viscosity
internal resistance of a fluid to flow
3.2
efflux time
time needed for a specified volume of a material to flow through a specified orifice at a specified
temperature
Note 1 to entry: The efflux time is an indirect measure of the viscosity and is also referred to as “pseudo-
viscosity”.
4 Principle
The efflux time of a petroleum cut-back or fluxed bituminous binder is determined using an efflux
viscometer known as the Standard Tar Viscometer (STV) which determines the time of efflux of a 50 ml
sample through a 10 mm or a 4 mm orifice at a specified temperature.
Whatever temperatures or orifice diameters used, the efflux time shall not exceed 600 s. For highly
viscous cut-back or fluxed bituminous binders, EN 13302 shall be used.
5 Reagents and materials
Light mineral or vegetal oil having a density lower or equal to 930 kg/m at 15 °C.
6 Apparatus
Usual laboratory apparatus and glassware, together with the following.
6.1 Efflux viscometer (example of assembled viscometer on Figure 1) consisting essentially of a cup
with an orifice in the centre of the base that may be closed by a ball-and-socket valve (Figure 3).
Two forms are required, differing only in the size of the orifice (10 mm and 4 mm). For other dimensions
of the cup and the ball valve, see Figure 3 and Table 3. The cup cylinder shall be made of brass. The ball
valve should be made of corrosion-resistant metal, with a ball on a rod, a levelling peg attached to the rod
and a hemispherical top by means of which the valve may be supported in a vertical position
The viscometer cups can be provided with suitable corks or caps for closing the orifices with the ball
valve in position (the closing with corks or caps is only required when conditioning the viscometer in a
separate bath). The viscometer cups shall be provided with some means of covering the cups (e.g. lids) to
minimize surface cooling effects. This lid shall not touch the test material when the cup is filled. It is
provided with a central hole through which the temperature measuring device can pass and with a groove
on one side through which the rod of the valve can pass.
The viscometer-cup holder shall be capable of:
— supporting one or more cups in a vertical position;
— providing a valve support to hold the valve at least 16 mm vertically above the orifice of the cup
during efflux of the test material (Figure 2).
To enhance resistance to wear and corrosion of the ball and socket valve, the bottom of the cup may be
made from a different, corrosion resistant, material and screwed to the brass tube. It is then advised to
use the same material, such as for instance phosphor-bronze, for the cup bottom and the ball valve.
Wrought nickel alloy with copper or metals NiCu30 in accordance with ISO 9722:1992 [1] are possible
materials for the rod of the ball valve.
It is allowed to use working apparatus with other technical solutions that meet the requirements of this
document, such as for example an integrated block viscometer, which is a combination of a specific efflux
viscometer, thermostating element and temperature controller.
6.2 Viscometer water bath, capable of maintaining the test temperature of 25,0 °C, 40,0 °C, 50,0 °C or
60,0 °C (8.3.1, 3), 4) and 5)) constant to within ±0,5 °C. Cups shall be separated from each other and from
the walls of the bath by at least 55 mm.
6.3 Separate temperature controlled water bath. A water bath (6.2), capable of maintaining the test
temperature constant to within ±0,5 °C, and in which one or more of the filled viscometer cups can be
immersed up to the rim of the cup.
Cups shall be separated from each other and from the walls of the bath by at least 55 mm.
A suitable support shall be provided to maintain the cup(s) in a vertical position.
The viscometer water bath (6.2) may also be used to directly condition the test sample in the cup.
6.4 Temperature measuring devices (combining sensor and reading unit), two, which shall:
— have a range from at least 10 °C to 70 °C;
— have a maximum permissible measurement error of ±0,2 °C or better;
— have a suitable length so that the measuring tip may be immersed at mid-height of the viscometer
water bath, separate water bath and visco
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