prEN 12272-1
(Main)Surface dressing - Test methods - Part 1: Rate of spread and accuracy of spread of binder and chippings
Surface dressing - Test methods - Part 1: Rate of spread and accuracy of spread of binder and chippings
This European Standard specifies test methods for determining the rates of spread and accuracy of spread of binder and chippings of a surface dressing on a section of road at a given time. It is also applicable to surface dressings on airfields and other trafficked areas.
The test methods are used on site to check the ability of binder sprayers and chipping spreaders to meet the intended rates of spread and tolerances and coefficients of variation.
The test methods for measuring the rates of spread and accuracy of spread of binders and chippings are not applicable to combined chipping-binder spreaders.
Oberflächenbehandlung - Prüfverfahren - Teil 1: Dosierung und Querverteilung von Bindemitteln und Splitt
Dieses Dokument legt Prüfverfahren für die Bestimmung der Dosierung und Genauigkeit der Verteilung von Bindemitteln und Splitt bei einer Oberflächenbehandlung zu einem bestimmten Zeitpunkt und in einem bestimmten Abschnitt einer Straßenoberfläche fest.
ANMERKUNG Dieses Prüfverfahren kann auch für die Bestimmung der Dosierung und Querverteilung von zum Beispiel als Haftvermittler oder Asphaltschutzsystem aufgespritzten Bitumenemulsionen verwendet werden. Die Produktleistungskategorien für die Dosierung und Querverteilung des Bindemittels in EN 12271 gelten nicht für Haftvermittler und Bindeschichten.
Die Prüfungen werden auf Baustellen benutzt, um zu überprüfen, ob die Bindemittel- und Splittverteiler die angegebenen Dosierungen und Variationskoeffizienten der Querverteilung einhalten.
Die Prüfverfahren können verwendet werden, um die Anforderungen an die werkseigene Produktionskontrolle (WPK) zu erfüllen:
- Kalibrierung der Ausrüstung (EN 12271:2006, Anhang B - Tabelle B.2); und
- Produktionsüberwachung (EN 12271:2006, Anhang B - Tabelle B.6).
Die Kalibrierung von Bindemittel- und Splittverteilern erfordert eine strikte Anwendung der in diesem Dokument beschriebenen Verfahren.
Bei der Anwendung dieser Verfahren für Inspektionen während der Produktion (WPK) sind bestimmte Änderungen der Verfahren aufgrund lokaler Besonderheiten und aufgrund der Eigenschaften der verwendeten Ausrüstung (zum Beispiel kombinierte Splitt-Bindemittelverteiler) zulässig. In diesem Fall werden die Änderungen bei der werkseigenen Produktionskontrolle dokumentiert und in den Prüfberichten angegeben.
Andere Prüfverfahren für die Überprüfung der Dosierung und Querverteilung des Bindemittels wie die Prüfung mit der statischen Spritzbalkenbank für Verteiler werden in diesem Dokument nicht behandelt, obwohl die in diesem Dokument beschriebenen Prüfverfahren für diesen Zweck angewendet werden können.
Enduits superficiels d'usure - Méthodes d'essai - Partie 1 : Taux d'épandage et régularité transversale du liant et des gravillons
Le présent document spécifie les méthodes d'essai à employer pour la détermination des taux d'épandage et de la régularité transversale du liant et des gravillons d'un enduit superficiel d'usure sur une section de route à un instant donné.
NOTE Cette méthode d’essai peut également être utilisée pour déterminer le taux d’épandage et la régularité transversale des émulsions bitumineuses répandues, par exemple lorsqu’elles sont utilisées comme enduits de scellement ou dispositifs d’étanchéité. Les catégories de performance pour le taux d’épandage et la régularité transversale des liants dans la norme EN 12271 ne s’appliquent pas aux enduits de scellement et aux couches d’accrochage.
Les méthodes d'essai sont utilisées sur site pour contrôler la capacité des répandeuses de liant et des gravilonneurs à respecter les taux d'épandage, tolérances et coefficients de variation prescrits.
Les méthodes d’essai peuvent être utilisées pour satisfaire aux exigences du Système de Maitrise de la Production
- étalonnage de l’atelier (EN 12271:2006, annexe B - tableau B.2); et
- inspection en cours de chantier (EN 12271:2006, annexe B - tableau B.6).-
L’étalonnage des répandeuses de liant et des gravillonneurs nécessite une application stricte des procédures décrites dans le présent document.
L’utilisation de ces méthodes pour les inspections en cours de mise en oeuvre (SMP) conduit à certaines adaptations en raison de la spécificité de certains chantiers et matériels utilisés (p. ex., Répandeur Gravillonneur Synchrone). Dans ce cas, les modifications sont documentées dans le Système de Maitrise de Production et identifiées dans les rapports d’essai.
D’autres méthodes d’essai utilisées pour vérifier le taux d’épandage et la régularité transversale du liant, comme la methode d’essai sur banc à poste fixe, ne sont pas couvertes par le présent document, bien que les méthodes d’essai qui y figurent puissent être utilisées à cette fin.
Površinske prevleke - Preskusne metode - 1. del: Količina pobrizga veziva in posipa drobirja
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 12272-1:2021
01-september-2021
Površinske prevleke - Preskusne metode - 1. del: Količina pobrizga veziva in
posipa drobirja
Surface dressing - Test methods - Part 1: Rate of spread and accuracy of spread of
binder and chippings
Oberflächenbehandlung - Prüfverfahren - Teil 1: Dosierung und Querverteilung von
Bindemitteln und Splitt
Enduits superficiels d'usure - Méthode d'essai - Partie 1: Taux d'épandage et régularité
transversale du liant et des gravillons
Ta slovenski standard je istoveten z: prEN 12272-1
ICS:
93.080.20 Materiali za gradnjo cest Road construction materials
oSIST prEN 12272-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 12272-1:2021
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oSIST prEN 12272-1:2021
DRAFT
EUROPEAN STANDARD
prEN 12272-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS 93.080.20 Will supersede EN 12272-1:2002
English Version
Surface dressing - Test methods - Part 1: Rate of spread
and accuracy of spread of binder and chippings
Enduits superficiels d'usure - Méthode d'essai - Partie Oberflächenbehandlung - Prüfverfahren - Teil 1:
1: Taux d'épandage et régularité transversale du liant Dosierung und Querverteilung von Bindemitteln und
et des gravillons Splitt
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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12272-1:2021 E
worldwide for CEN national Members.
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prEN 12272-1:2021 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Determination of the rate of spread of binder . 5
4.1 Principle . 5
4.2 Apparatus . 5
4.3 Procedure . 6
4.4 Expression of results . 8
4.5 Test report . 9
5 Determination of the accuracy of spread of binder . 9
5.1 Principle . 9
5.2 Apparatus . 10
5.3 Procedure . 10
5.4 Expression of results . 10
5.5 Test report . 12
6 Determination of the rate of spread of chippings . 13
6.1 Principle . 13
6.2 Apparatus . 13
6.3 Procedure . 14
6.4 Expression of results . 15
6.5 Proportional range calculation . 17
6.6 Test report . 18
7 Determination of the accuracy of spread of chippings . 18
7.1 Principle . 18
7.2 Apparatus . 18
7.3 Procedure . 19
7.4 Expression of results . 20
7.5 Test report . 21
Annex A (informative) Determination of the “shoulder to shoulder” rate of spread of
chippings . 22
Annex B (informative) Example of equipment used in the determination of the accuracy of spread
of binder test . 23
Annex C (informative) Determination of the accuracy of spread of binder . 29
Annex D (informative) The picking frame, used in the determination of the accuracy of spread of
chipping test . 31
Bibliography . 33
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European foreword
This document (prEN 12272-1:2021) 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 12272-1:2002.
This document is one of a series of standards as listed below:
— EN 12272-1, Surface dressing – Test methods – Part 1: Rate of spread and accuracy of spread of binder
and chippings
— EN 12272-2, Surface dressing – Test methods – Part 2: Visual assessment of defects
— EN 12272-3, Surface dressing – Test methods – Part 3: Determination of binder aggregate adhesivity
by the Vialit plate shock test method
In this document, the Annexes A, B and C are informative.
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1 Scope
This document specifies test methods for determining the rates of spread and accuracy of spread of
binder and chippings of a surface dressing on a section of road at a given time.
NOTE This test method can also be used for determining the rate of spread and accuracy of spread of sprayed
bituminous emulsions, e.g. when used as bond coats or asphalt preservation systems. The performance categories
for binder rate of spread and accuracy of spread in EN 12271 do not apply to bond coats and tack coats.
The test methods are used on site to check the ability of binder sprayers and chipping spreaders to meet
the intended rates of spread and tolerances and coefficients of variation.
The test methods can be used to fulfil the Factory Production Control requirements:
— equipment calibration (EN 12271:2006, Annex B – Table B.2); and
— production inspection (EN 12271:2006, Annex B – Table B.6).
The calibration of binder and chipping spreaders requires strict application of the procedures described
in this document.
Using these methods for inspections during production (FPC) allows certain changes to these methods
due to the specificity of certain sites and materials used (e.g. combined chipping-binder spreaders). In
this case, the changes are documented in the Factory Production Control and identified in the test reports.
Other test methods used to check the rate of spread and accuracy of spread of binder, such as the static
spray bar bench test for sprayers, are not covered by this document, although the test methods in this
document can be used for this purpose.
2 Normative references
There are no normative references in this document.
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 https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
surface dressing
surface treatment consisting of the successive laying of at least one layer of binder and at least one layer
of chippings
3.2
chipping
coarse aggregate within a narrow grading range, practically free of fines
Note 1 to entry: Chippings can have specified values for strength, soundness, shape, polishing resistance, resistance
to abrasion, purity, durability and affinity to bituminous binder. Chippings should be washed to achieve the required
fines content.
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3.3
rate of spread of binder
2 2
average mass of binder in kilograms per square metre (kg/m ), or average volume of binder in L/m
applied to the road surface when measured in accordance with this document
3.4
rate of spread of chippings
2 2
average bulk volume in litres per square metre (L/m ) or, mass in kilograms per square metre (kg/m )
applied to the road surface, when measured in accordance with this document
3.5
proportional range
difference between the maximum and minimum individual values of rates of spread of binder or
chippings determined divided by the mean value, using the test methods in this document
3.6
accuracy of spread of binder
coefficient of variation of the mass of binder applied to the road surface when measured in accordance
with this document
Note 1 to entry: The value and graph indicate the ability of the sprayer to apply binder evenly across the road.
3.7
accuracy of spread of chippings
coefficient of variation of the mass of chippings applied to the road surface when measured in accordance
with this document
Note 1 to entry: The value and graph indicate the ability of the chipping spreader to apply the chippings evenly
across the road.
4 Determination of the rate of spread of binder
4.1 Principle
Samples of the binder sprayed by the binder sprayer are collected to determine the average rate of
2
spread. The minimum total test area shall be 0,5 m with the collectors where possible spaced evenly
across the full width of the road to be sprayed.
4.2 Apparatus
4.2.1 Collectors
Collectors shall be of material sufficiently robust to resist deformation in use and be capable of retaining
100 % applied binder.
The sprayer shall achieve a consistent operation before the test commences.
4.2.2 Portable balance
Portable balance, readable to 1 g and of sufficient capacity to weigh one tray with 1,5 × the maximum rate
of spread of binder.
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4.2.3 Plastic bags
Plastic bags or similar, if used, shall be lightweight and capable of containing the binder and collector for
weighing without any loss by leakage or evaporation.
4.2.4 Tape
Adhesive tape, if used, to hold the collectors to the road and to mask them to the required dimensions.
When removed, the adhesive tape shall not damage the masked parts of collectors to ensure there is no
loss in mass of the underlying material.
4.3 Procedure
4.3.1 Preparation of the collectors
Ensure each collector is traceable to its position on the road surface under test. If necessary, mark the
collectors with an indelible identification. Weigh the collectors together with a plastic bag (if used), to the
nearest 1 g and record these masses as the mass of each collector before spraying.
4.3.2 Location and placement of the collectors
Space the collectors across the width of road which is to be sprayed with binder, and at least 200 mm
from the edge as shown in Figure 1. If adhesive tape is used to secure the collectors to the road during
spraying, measure the length and width of each of the areas exposed to the binder spray to the nearest
5 mm for the calculation of the exposed area.
When the rates of transverse distribution are intentionally different in the same transverse profile then
the collectors related to the same measurement should be placed in areas where the intended rate of
spread is the same.
Care should be taken to ensure that when spray curtains are being used, they are raised to avoid touching
the collectors.
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Dimensions in millimetres
Key
1 spraying direction
2 edge of spray
3 trays, boards or tiles (minimum 3)
4 area A
i
5 foam sheet or absorbent material insert
6 thickness (maximum 25 mm)
7 tape
8 metal tray
Figure 1 — Informative Collectors, diagrammatic
4.3.3 Removal and weighing of the collectors
Within 3 min of the binder being sprayed onto the road, but before any chippings are applied, remove the
collectors from the road surface. Then insert each collector into its own plastic bag, if used, before
weighing it to the nearest 1 g. Care shall be taken not to lose or gain any binder. Weighing shall be carried
out within 10 min unless the plastic bags or similar materials minimize the loss of water from emulsions
or volatiles so that the results are not affected within the tolerances of the test by the time delay before
weighing. Record the mass of each collector and bag, if used, after spraying. The calculation below
2 2
assumes the binder mass in kg/m is known so when measuring rate of spread in L/m this shall be
converted using the density of the binder at spraying temperature.
Methods to test the residual binder, permitting the water and volatiles to evaporate, may be used
provided a correlation to the immediate test has been carried out.
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4.4 Expression of results
Calculate the binder mass:
MM− M
i 2i 1i
(1)
where
M is the binder mass retained on the collector, expressed in kilograms (kg);
i
M is the mass of the collector after spraying, expressed in kilograms (kg);
2i
M is the mass of the collector before spraying, expressed in kilograms (kg).
1i
Calculate the rate of spread:
M
i
d =
i
A
i
(2)
where
2
d is the rate of spread of binder, expressed in kilograms per square metre (kg/m ), for
i
each collector;
M is the binder mass retained on the collector, expressed in kilograms (kg);
i
2
A is the area of collector exposed to the binder spray, expressed in square metres (m ).
i
Calculate the mean rate of spread of the binder:
d + d ++dd ++d .d
( )
1 2 3 4 5 N
D=
N
(3)
where
D is the mean rate of spread of binder, expressed in kilogram per square metre
2 2
(kg/m ), reported to the nearest 0,05 kg/m ;
d to d are the rates of spread of binder on each collector;
i N
N is the number of collector used in the test.
Calculate the proportional range:
d − d
( )
max min
P =
R
D
(4)
where
PR is the proportional range;
d is the highest rate of spread of binder found on an individual collector;
max
d is the lowest rate of spread of binder found on an individual collector.
min
If the proportional range is greater than 0,20 this indicates the binder spreader is not functioning
properly.
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4.5 Test report
The test report shall contain:
a) a statement that the test has been performed in accordance with this document;
b) identification of sprayer and spray bar used;
c) spray bar height;
d) spray bar pressure
e) spray bar width used;
f) location of site test;
g) date of test;
h) climatic conditions likely to affect the test result (e.g. windy, etc.);
i) binder temperature recorded from the tank;
j) binder type (e.g. binder grade).
k) specified rate of spread and tolerance;
l) results as calculated in 4.4;
m) any deviation from the test method; and
n) name and signature of the person responsible for producing the test report.
5 Determination of the accuracy of spread of binder
5.1 Principle
Binder is collected on a number of collectors which are placed side by side on the road surface, across the
full width which is to be sprayed, prior to the spraying of the binder. The mass of binder on each device
is then determined from the difference between the masses of the collector before and after spraying the
binder and the arithmetic mean of all these binder masses calculated. This test is also known as the
“Determination of the transverse distribution of binder”.
Some combined machines do not permit testing across the full width and alternative methods have to be
employed. These may be accepted as surrogate methods in factory production control documents.
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5.2 Apparatus
5.2.1 Collectors
Collectors, used for sampling the binder, should be made of suitable material. Each shall be able to collect
2 2
0,5 kg/m to 3 kg/m or a minimum of 1,5 × the specified binder rate of spread. Each shall be
dimensionally stable and retain an adequate collecting capacity even after being run over by the wheels
of the spraying vehicle. Each shall also collect the sprayed binder without any loss, overflow or transfer
from one collector to the next.
For the determination of the accuracy of spread of binder, the width of each collector shall be 400 mm,
250 mm, 150 mm, 100 mm or 50 mm and the length of each collector shall be at least 50 mm. The
minimum sample size shall be 100 mm × 50 mm. These dimensions shall be measured to the nearest
0,2 mm for the 100 mm × 50 mm collectors and 1 mm for the 100 mm × 200 mm or larger collectors.
Two types of device are described in B.1 and B.2 but the latter type is not recommended when spraying
low viscosity emulsions.
5.2.2 Portable balance
Portable balance, readable to the nearest 0,1 g for 100 mm × 50 mm samples or 0,3 g for
100 mm × 200 mm or larger samples.
5.3 Procedure
5.3.1 Preparation of the test apparatus
Clearly number or otherwise identify each collector and determine its mass to the nearest 0,1 g in the
case of 100 mm × 50 mm samples or 0,3 g for 100 mm × 200 mm or larger samples. If all the collectors
have a similar mass within a limit deviation of ± 0,3 g only one shall be weighed and this value recorded
for each of them.
5.3.2 Location and placement of the apparatus
The sprayer shall achieve a consistent operation before the test commences. Place the collectors
transversely on the road surface so that the binder is sampled from at least the full width which is to be
sprayed.
5.3.3 Removal and weighing of the collectors
After spraying the binder, remove the collectors from the road surface as fast as practically possible in
order to minimize any loss of water from emulsion binders or volatile substance. This may be
accomplished by using pre-weighed plastic bags or similar to pick up and seal the collectors. Then, within
30 min, determine the mass of each collector with binder to the nearest 0,1 g for samples
100 mm × 50 mm or 0,3 g for samples 100 mm × 200 mm or larger and record the results. This time may
be extended if it can be demonstrated that loss of water or volatiles has not occurred to affect the result
within the tolerances of the test. Methods to test the residual binder, permitting the water and volatiles
to evaporate may be used provided a correlation to the immediate test has been carried out.
Care should be taken to ensure that when spray curtains are being used, they are raised to avoid touching
the collectors.
5.4 Expression of results
The collectors at each end of the sprayed width which are empty or only partly filled shall be ignored.
Those remaining shall total number N (see Figure 2).
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Key
1 N devices with full rate of spread of binder
Figure 2 — Example with three spray jets overlapping
Calculate the binder mass collected on each collector, as follows:
MM− M
i 2i 1i
(5)
where
M is the binder mass retained on the collector, expressed in kilograms (kg);
i
M is the mass of the collector after spraying, expressed in kilograms (kg);
2i
M is the mass of the collector before spraying, expressed in kilograms (kg).
1i
Calculate the arithmetical mean of all the binder masses as follows:
MM++ .M
( )
1 2 N
X=
N
(6)
where
X is the arithmetical mean of all the binder masses;
M is the binder mass retained on the first collector, expressed in kilograms (kg);
1
M is the binder mass retained on the second collector, expressed in kilograms (kg);
2
th
M is the binder mass retained on the n collector, expressed in kilograms (kg);
N
N is the number of collectors.
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Calculate the variance as follows:
22 2
M −+X MX−+ .+ M − X
( ) ( ) ( )
( 12 N )
2
S =
N−1
( )
(7)
where
2
S is the variance of all the binder masses;
M is the binder mass retained on the first collector, expressed in kilograms (kg);
1
M is the binder mass retained on the second collector, expressed in kilograms (kg);
2
th
M is the binder mass retained on the n collector, expressed in kilograms (kg);
N
X is the arithmetic mean of all the binder masses;
N is the number of collectors.
2
The standard deviation, S, is the square root of the variance, i.e. .
S
Calculate the coefficient of variation as follows:
S
C ×100
V
X
(8)
where
C is the coefficient of variation;
V
S is the square root of the variance;
X is the arithmetic mean of all the binder masses.
Record the results and plot them on a form similar to that provided in Annex C (informative).
5.5 Test report
The test report shall contain:
a) a statement that the test has been performed in accordance with this document;
b) the unique identification of the sprayer and spray bar used;
c) spray bar height;
d) spray bar pressure
e) spray bar width used;
f) location of test site;
g) date of test;
h) climatic conditions likely to affect the test result;
i) binder temperature recorded from the tank;
12
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j) binder type;
k) configuration single or double (see Figures B.2 and B.3);
l) sample size;
m) specified rate of spread and coefficient of variation;
n) results as calculated in 5.4;
o) any deviations from this document; and
p) name and signature of the person responsible for conducting the test.
6 Determination of the rate of spread of chippings
6.1 Principle
Chippings are collected by collectors laid on the road in front of the chipping spreader in order to
determine the rate of spread.
Collectors shall enable chippings to be sampled for a minimum area. The chippings may be weighed or
measured in terms of bulk volume, whichever is convenient.
The areas collected shall be a minimum of three collectors measuring 800 mm × 250 mm or alternatively
by five metal trays measuring 300 mm × 300 mm (all with internal dimensions ± 2 mm).
6.2 Apparatus
6.2.1 Box collector
Rectangular box with a rigid, sliding, transparent graduated lid, as shown in Figure 3.
Dimensions in millimetres
Key
1 graduations
2 transparent graduated lid
3 sleeve for lid
4 support pin
NOTE Dimensions shown are all internal, with a tolerance of ± 2 mm.
Figure 3 — The chipping rate of spread box
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The lid shall either have 5 mm graduations or be directly graduated in litres per square metre (5 mm is
2
equivalent to 0,25 L/m ). For ease of reading, graduations shall be marked on both of the longer edges of
the top of the lid.
NOTE The box can be fitted with support pins in case it has to be placed on the binder film.
6.2.2 Portable balance
Portable balance, readable to 10 g and sufficient capacity to weigh both the box and the maximum rate of
spread of chippings.
6.2.3 Tray collector
Square tray made of metal (e.g. aluminium, or other suitable material) with four short chains secured to
a metal hook as shown in Figure 4.
The dimensions of each tray in millimetres (mm) shall be the following:
Side length (300 ± 2) mm to (300 ± 2) mm;
NOTE The tray can be fitted with support pins in case it has to be placed on the binder film.
Figure 4 — Tray with chains and central hook for weighing
6.2.4 Spring balance with calibrated check masses
2
Calibrated spring balance with a scale reading in kg/m range 0 to 16.
2 2
Two calibrated check masses, one at equivalent 6 kg/m and one at 14 kg/m . (Oven-dried sand in an
airtight metal lever lid can would be suitable.)
6.3 Procedure
6.3.1 Rate of spread with the box collector (see 6.2.1)
6.3.1.1 Rate of spread in terms of bulk volume
Place three boxes (see 6.2.1), with the lid removed, in front of and between the wheels of the chipping
spreader in order to collect the chippings.
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oSIST prEN 12272-1:2021
prEN 12272-1:2021 (E)
When the chipping spreader has passed over the three boxes, their lids are replaced and each box is stood
on its end and tapped three times on a hard surface so as to ensure that the top surface of the chippings
contained in the box is flat and level.
Measure and record the height, H, of the top surface of the chippings to the nearest 5 mm.
2
If the scale on the box has been graduated in litres per square metre (L/m ), measure and record the
2
volume, V, of the chippings to the nearest 0,25 L/m .
6.3.1.2 Rate of spread in terms of mass
The mass of the chippings collected in each box is determined from the difference between the mass of
the box con
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