prEN 12697-38

SLOVENSKI STANDARD
01-januar-2021
Bitumenske zmesi - Preskusne metode - 38. del: Splošne zahteve za opremo in
umerjanje
Bituminous mixtures - Test methods - Part 38: Common equipment and calibration
Asphalt - Prüfverfahren - Teil 38: Prüfeinrichtung und Kalibrierung
Mélanges bitumineux - Méthodes d'essai - Partie 38: Équipement commun et calibrage
Ta slovenski standard je istoveten z: prEN 12697-38
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2020
ICS 93.080.20 Will supersede EN 12697-38:2004
English Version
Bituminous mixtures - Test methods - Part 38: Common
equipment and calibration
Mélanges bitumineux - Méthodes d'essai - Partie 38: Asphalt - Prüfverfahren - Teil 38: Prüfeinrichtung und
Équipement commun et calibrage Kalibrierung
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 227.
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, 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, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12697-38:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 General . 8
4.1 Overriding requirements . 8
4.2 Shared requirements . 8
4.3 Equipment identification . 8
5 Test equipment . 8
5.1 Constant temperature baths . 8
5.2 Centrifuges . 8
5.3 Rubber . 8
6 Calibration . 9
6.1 Laboratory reference standards . 9
6.2 Calibration and checking . 9
6.3 Solvents . 10
Annex A (informative) Recommendations for laboratory management . 11
Annex B (informative) Accuracy of measurement . 12
Annex C (informative) Rounding of values for reported results . 15
Bibliography . 16

European foreword
This document (prEN 12697-38:2020) has been prepared by Technical Committee CEN/TC 227 “Road
materials”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12697-38:2004.
The main changes compared to the previous edition are listed below:
— the title no longer refers to hot mix asphalt;
— [ge] editorial update according to current standard template.
A list of all parts in the EN 12697 series can be found on the CEN website.
1 Scope
This document specifies general requirements for common test equipment, calibration procedures and
reagents for the testing of bituminous materials in the EN 12697 series of standards.
NOTE 1 This document makes use by reference of the requirements for common equipment and calibration
prepared for aggregates.
NOTE 2 Bodies providing accreditation of test equipment may need to consider alternative requirements
and/or calibration frequencies in order to cover the possibilities of National Health & safety, regulatory and
legislative requirements.
Advice is also given on recommendations for laboratory management (Annex A), on the accuracy of
measurement (Annex B) and on the rounding of values for reported results (Annex C).
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 932-5, Tests for general properties of aggregates - Part 5: Common equipment and calibration
EN 61010-2-020, Safety requirements for electrical equipment for measurement, control, and laboratory
use - Part 2-020: Particular requirements for laboratory centrifuges (IEC 61010-2-020)
EN ISO 376, Metallic materials - Calibration of force-proving instruments used for the verification of
uniaxial testing machines (ISO 376)
ISO 48-2, Rubber, vulcanized or thermoplastic - Determination of hardness - Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 48-5, Rubber, vulcanized or thermoplastic - Determination of hardness - Part 5: Indentation hardness
by IRHD pocket meter method
ISO 4662, Rubber, vulcanized or thermoplastic - Determination of rebound resilience
ISO 11095, Linear calibration using reference materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
calibrating
set of operations that establish, under specified conditions, the relationship between values of
quantities indicated by a measuring instrument or measuring system, or values represented by a
material measure or a reference material, and the corresponding values realized by standards
Note 1 to entry: See ISO 10012.
3.2
checking
operation of assuring either:
— that the results of measurements of a property (such as length, mass, temperature or time) at
selected values made by an item, or a set of items, of equipment has not deviated from that which
was measured when the equipment was last calibrated within a pre-defined tolerance; or
— that a property (such as hardness) of an item, or a set of items, of equipment complies with the
relevant requirements for that equipment
3.3
reference instrument
item of equipment that is used to calibrate other items of equipment that are to be used to perform tests
Note 1 to entry: A reference instrument should not be used to perform a test.
3.4
reference document
item with a property (such as mass or length) whose known value is traceable to national standards and
is used in the calibration of items of equipment that is to be used to perform tests
Note 1 to entry: A reference document should not be used to perform a test.
3.5
accuracy (of a measurement)
difference between the measurement and the real or target value; normally, the accuracy consists of
two items: accuracy = random error or precision + systematic error or bias (trueness)
Note 1 to entry: The accuracy of measurement is important because there is uncertainty in any measurement of
physical properties. This uncertainty results from variations between two measurements of nominally identical
samples and can result from various reasons including:
— differences in the composition of the samples tested;
— differences in the dimensions and shape of the samples tested;
— differences in equipment (dimensions, stiffness of moving parts, etc) used to carry out the tests;
— the precise procedure that the test is carried out (often due to different layout of equipment within different
laboratories);
— the physical strength (in terms of the time to press buttons or speed in lifting items), speed of reactions and
predilections of the operatives; and
— the precise environmental conditions prevalent during the test.
These differences can be so minor that it is impractical to specify them within a test procedure, but they still
combine to produce noticeable differences.
Note 2 to entry: There is a distinction between “readability” and “accuracy”. If equipment can be accurately read
to 1 unit, then the random error in the value of the reading cannot be less than ± 0,5 units, that is 1 unit. There can
also be random errors in the measurement method. Therefore, the accuracy of equipment, that is the total random
error plus any bias, can never be closer than its readability and will usually be in excess of that. However,
equipment cannot be calibrated to better than the readability, so that the accuracy is generally an order of
magnitude greater than the readability and should always be at least twice the readability.
Note 3 to entry: See Figure 1.
3.6
standard deviation (of a measurement)
quantitative statistical expression of the precision of a measurement
Note 1 to entry: There does not have to be a relation between precision and accuracy. A measurement can be
precise and not accurate (in which case the bias is large). See Figure 1.

Key
1 standard deviation σ , s 5 average of multiple measurements μ , x
2 random error 6 target value t
3 systematic error or bias δ 7 accuracy
4 single measurement
Figure 1 — Diagram showing definitions
Note 2 to entry: The size of the random error for a single measurement and the systematic error or bias for the
target value are illustrative only and do not show the size of these values for all, or even most, cases.
3.7
confidence
expectation that a measurement will be in an interval of results, between a lower and an upper value
Note 1 to entry: The interval normally used is with a confidence of 95 %.
Note 2 to entry: A small confidence interval characterises a confident measurement method. The associated
standard deviation of the measurement will be small.
Note 3 to entry: Confidence does not relate to the systematic error or the accuracy of a measurement.
Note 4 to entry: See Table 1 for translations of the different terms that are related to measurements and testing.
Table 1 is based on part of Dutch Standard NEN 3114.
Table 1 — Terminology for measurement and testing
English French German Dutch
confidence level: confidence niveau de confiance statistische Sicherheit betrouwbaarheid
coefficient
confidence interval intervalle de confiance Vertrauensbereich betrouwbaarheidsinter
val
correction correction Korrektur correctie
individual measurement; mesure unique; Einzelwert; enkelvoudige
single observation observation isolée Einzelbeobachtung meetuitkomst
sample standard deviation écart-type Standardabweichung gemeten
d'échantillon standaardafwijking
deviation from the sample écart par rapport à la Abweichung vom gemeten toevallige
mean; deviation from the moyenne arithmétique Mittelwert afwijking
arithmetic mean
arithmetic mean; sample moyenne arithmétique (arithmetischer) gemiddelde
mean Mittelwert
target value valeur de consigne wahrer Wert gezochte waarde
repeatability répétabilité Wiederholbarkeit herhaalbaarheid
measurement mesurage; mesure Messung meting
measuring instrument; instrument de Messgerät; meetinstrument
measuring equipment mesurage Messinstrument
measuring method Méthode de mesurage Messmethode meetmethode
population mean moyenne théorique Mittelwert der meetverwachting
Grundge-samtheit
nominal value valeur nominale Nennwert nominale waarde
inaccuracy imprécision Messunsicherheit onnauwkeurigheid
systematic error; bias erreur systématique; systematischer Fehler systematische
biais afwijking; onzuiverheid
precision exactitude Genauigkeit precisie
reproducibility reproductibilité Reproduzierbarkeit reproduceerbaarheid
range Étendue Variatonsbereich spreidingsbreedte
standard deviation Ecart-type Standardabweichung standaardafwijking
der Grundgesamtheit
standard deviation of the écart-type de la Standardabweichung standaardafwijking van
mean moyenne arithmétique des Mittelwertes het gemiddelde
random error erreur aléatoire zufälliger Fehler toevallige afwijking
outlier; maverick observation aberrante Ausreißer uitschieter
coefficient of variation coefficient de variation Variationskoeffizient variatiecoëfficiënt
unbiased; without non biaisé; sans erreur ohne systematische zuiver
systematic error systématique Fehler
4 General
4.1 Overriding requirements
The requirements in this document supplement the requirements in other documents that call up this
document. When both standards have requirements on a specific aspect, the requirement in the
standard calling up this document shall take precedence.
It is recommended that the testing laboratory have adequate documented instructions on all relevant
equipment, on the test samples and on standard testing techniques (Annex A).
4.2 Shared requirements
The requirements of EN 932-5 shall apply for all items of equipment covered in EN 932-5. Those
requirements of EN 932-5 that are not equipment-specific shall also apply to all equipment covered in
this document.
4.3 Equipment identification
Each item of equipment shall be uniquely identified and shall be checked before first use and at regular
intervals thereafter (as defined in EN 932-5 or elsewhere in this document) to ensure that it complies
with this clause and, if necessary, replaced. When equipment is replaced, the old item shall be calibrated
to identify any errors arising since its last calibration. A piece of equipment referred to as a calibrated
item shall have been calibrated.
5 Test equipment
NOTE Advice on the required accuracy of measurement for equipment, test actions, test results and their
inter-relationship is given in Annex B.
5.1 Constant temperature baths
Constant temperature baths shall incorporate a thermostatic temperature control which can be set to
maintain the specified working temperature to within ± 2 °C.
5.2 Centrifuges
Centrifuges shall co
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