SIST-TS CEN/TS 15901-11:2011

Road and airfield surface characteristics - Part 11: Procedure for determining the skid resistance of a pavement surface using a device with longitudinal block measurement (LFCSR): the SRM

This Technical Specification describes a method for determining the skid resistance of paved surface by measurement of the longitudinal friction coefficient SRM
The method provides a measure of the wet skid resistance properties of a bound surface by measurement of the longitudinal friction coefficient using a locked wheel with a slip ratio of 0 % (locked wheel: standard), or a slip ratio of (15  1) % or ABS and a controlled speed. The test tyre is dragged over a pre-wetted pavement under controlled load and constant speed conditions while the test tyre is parallel to the direction of motion and to the pavement.
This document covers the operation of the Stuttgarter Reibungsmesser (SRM) of the IVT ETH Zürich.

Oberflächeneigenschaften von Straßen und Flugplätzen - Teil 11: Verfahren zur Bestimmung der Griffigkeit von Fahrbahndecken durch Messung des Gleitbeiwertes am blockierten Schlepprad: das SRM-Messgerät

Diese Technische Spezifikation beschreibt ein Verfahren zur Bestimmung der Griffigkeit von Fahrbahndecken durch Messung des Reibungskoeffizienten in Längsrichtung μSRM. Dieses Verfahren liefert ein Maß für die Nassgriffigkeitseigenschaften einer gebundenen Oberfläche durch Messung des Reibungskoeffizienten in Längsrichtung mit Hilfe eines gebremsten Messreifens und einem Schlupfverhältnis von 0 % (gebremster Reifen: Standard) oder einem Schlupfverhältnis von (15 ± 1) % oder ABS, wobei eine geregelte Geschwindigkeit verwendet wird. Der Messreifen wird mit geregelter Belastung und konstanter Geschwindigkeit über eine zuvor angenässte Fahrbahndecke gezogen, wobei er parallel zur Bewegungsrichtung und zur Fahrbahn läuft. Dieses Dokument behandelt den Betrieb des Stuttgarter Reibungsmessers (SRM) des Instituts für Verkehrsplanung und Transportsysteme (IVT) der Eidgenössischen Technischen Hochschule (EHT) Zürich.

Caractéristiques de surface des revêtements de chaussée des routes et des aérodromes - Partie 11: Mode opératoire de détermination de l'adhérence de la surface d'un revêtement de chaussée à l'aide d'un dispositif de mesure longitudinale, roue bloquée (CFLSR): le SRM

La Spécification technique décrit une méthode permettant de déterminer l'adhérence de la surface d’un revêtement de
chaussée par mesure du coefficient de frottement longitudinal mSRM.
La méthode permet de mesurer les propriétés d'adhérence sur chaussée mouillée d'une couche de roulement, en
déterminant le coefficient de frottement longitudinal à l'aide d'une roue bloquée avec un taux de glissement de 0 %
(roue bloquée : normalisée) ou un taux de glissement de (15 ± 1) % ou ABS et une vitesse contrôlée. Le pneumatique
d'essai est traîné dans le sens du déplacement parallèlement à la chaussée préalablement mouillée, dans des
conditions contrôlées de charge et à vitesse constante.
Le présent document couvre l'utilisation du Stuttgarter Reibungsmesser (SRM) mis au point par l'IVT de l'ETH Zürich.

Značilnosti cestnih in letaliških površin - 11. del: Postopek določanja torne sposobnosti vozne površine z mehanizmom za kontrolirano blokiranje v vzdolžni smeri (LFCSR): SRM

Ta dokument opisuje metodo določanja torne sposobnosti vozne površine z meritvijo količnika trenja s SRM.
Metoda določa merilo lastnosti tornih sposobnosti mokre omejene površine z meritvijo količnika trenja z uporabo zaklenjenega kolesa s stopnjo zdrsa 0 % (zaklenjeno kolo: standardno) ali stopnjo zdrsa (15 ± 1) % ali ABS in nadzorovano hitrostjo. S preskusno pnevmatiko se zavira na predhodno namočeni površini pod nadzorovanimi pogoji upora in hitrosti, medtem ko je preskusna pnevmatika vzporedna s smerjo gibanja in površino.
Ta dokument zajema delovanje Stuttgartskega merilca tornosti (Stuttgarter Reibungsmesser, SRM) od IVT ETH Zürich.

General Information

• Status: Published
• Publication Date: 10-May-2011
• ICS: 17.040.20 - Properties of surfaces
• ICS: 93.080.10 - Road construction
• ICS: 93.120 - Construction of airports
• Technical Committee: CES - Roads
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-May-2011
• Due Date: 10-Jul-2011
• Completion Date: 11-May-2011
• Ref Project: CEN/TS 15901-11:2011 - Road and airfield surface characteristics - Part 11: Procedure for determining the skid resistance of a pavement surface using a device with longitudinal block measurement (LFCSR): the SRM

Overview

CEN/TS 15901-11:2011 defines a standardized procedure to determine the skid resistance of paved road and airfield surfaces using the Stuttgarter Reibungsmesser (SRM). The Technical Specification measures the longitudinal friction coefficient (µSRM) by dragging a standardized test tyre over a pre‑wetted pavement under controlled load, speed and slip conditions. It is intended for evaluation of wet skid resistance on bound surfaces and covers the operation of the SRM device (IVT ETH Zürich).

Key topics and technical requirements

• Measurement principle: Longitudinal friction coefficient (LFC) measured with a locked wheel (0% slip) or selectable slip (15 ± 1% or ABS) and controlled operating speed to simulate locked-braking behavior.
• Test equipment: SRM test truck with a rear measuring wheel, pneumatic load unit, torque/strain gauges, PC-controlled acquisition and water flow control.
• Test wheel and tyre: Standard ribbed tubeless AIPCR tyre 165 R15 (four longitudinal grooves), minimum profile 4 mm, tyre pressure 1.5 bar at 20 °C. Vertical load typically 3 500 N.
• Water film and application: Controlled pre-wetting to produce a theoretical water film (usual value 0.5 mm); water layer at least 25 mm wider than tyre tread; water quality free of solids, oil or additives.
• Operating speeds and ranges: Typical measuring speeds include 40, 60, 80 and 100 km/h; section lengths up to 50 km per tank fill.
• Calibration and quality control: Procedures for calibration, repeatability and reproducibility are specified; data logging of vertical load, speed, distance and µSRM is required.
• Safety and environment: Measures for traffic control and avoidance of testing when water might freeze or create hazards for road users.

Applications and users

CEN/TS 15901-11:2011 is practical for:

• Road and airport pavement engineers and maintenance teams for network monitoring, project‑level acceptance and performance verification.
• Highway and airport authorities for safety audits and pavement management systems.
• Contractors and material suppliers for acceptance testing of new or renewed surfaces.
• Research organizations studying wet skid resistance, tyre–pavement interaction and surface design.
• Winter-condition or special-purpose testing (with separately defined methods).

Keywords: skid resistance, SRM, Stuttgarter Reibungsmesser, longitudinal friction coefficient, LFCSR, pavement surface, wet skid resistance, pavement management.

Related standards

This CEN Technical Specification sits within the CEN series on road and airfield surface characteristics and is intended to complement other friction and texture measurement standards used in pavement assessment and safety regulation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2011
=QDþLOQRVWLFHVWQLKLQOHWDOLãNLKSRYUãLQGHO3RVWRSHNGRORþDQMDWRUQH
VSRVREQRVWLYR]QHSRYUãLQH]PHKDQL]PRP]DNRQWUROLUDQREORNLUDQMHYY]GROåQL
VPHUL/)&65650
Road and airfield surface characteristics - Part 11: Procedure for determining the skid
resistance of a pavement surface using a device with longitudinal block measurement
(LFCSR): the SRM
Oberflächeneigenschaften von Straßen und Flugplätzen - Teil 11: Verfahren zur
Bestimmung der Griffigkeit von Fahrbahndecken durch Messung des Gleitbeiwertes am
blockierten Schlepprad: das SRM-Messgerät
Caractéristiques de surface des revêtements de chaussée des routes et des aérodromes
- Partie 11: Mode opératoire de détermination de l'adhérence de la surface d'un
revêtement de chaussée à l'aide d'un dispositif de mesure longitudinale, roue bloquée
(CFLSR): le SRM
Ta slovenski standard je istoveten z: CEN/TS 15901-11:2011
ICS:
17.040.20 Lastnosti površin Properties of surfaces
93.080.10 Gradnja cest Road construction
93.120 *UDGQMDOHWDOLãþ Construction of airports
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 15901-11
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
March 2011
ICS 93.080.20; 93.120
English Version
Road and airfield surface characteristics - Part 11: Procedure for
determining the skid resistance of a pavement surface using a
device with longitudinal block measurement (LFCSR): the SRM
Caractéristiques de surface des revêtements de chaussée Oberflächeneigenschaften von Straßen und Flugplätzen -
des routes et des aérodromes - Partie 11: Mode opératoire Teil 11: Verfahren zur Bestimmung der Griffigkeit von
de détermination de l'adhérence de la surface d'un Fahrbahndecken durch Messung des Gleitbeiwertes
revêtement de chaussée à l'aide d'un dispositif de mesure (LFCSR) am blockierten Schlepprad: das SRM-Messgerät
longitudinale, roue bloquée (CFLSR): le SRM
This Technical Specification (CEN/TS) was approved by CEN on 14 September 2010 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, Croatia, 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: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15901-11:2011: E
worldwide for CEN national Members.

Contents
Page
Foreword .3
1 Scope .4
2 Recommended uses .4
3 Terms and definitions .4
4 Safety .6
5 Principle .6
5.1 Principle of measurements .6
5.2 Operating principle .7
6 Key characteristics .7
6.1 General .7
6.2 Test equipment .7
6.3 Test wheel assembly .8
6.4 Test tyre .8
6.5 Water supply and flow control .8
6.6 Parameters recorded .8
7 Test procedure .9
7.1 Standard testing conditions .9
7.2 Prior to testing .9
7.3 Testing .9
8 Data recording . 10
9 Calibration . 10
10 Precision . 10
11 Test report . 11
Bibliography . 12

Foreword
This document (CEN/TS 15901-11:2011) has been prepared by Technical Committee CEN/TC 227 “Road
materials”, the secretariat of which is held by DIN.
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, Croatia, 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 Technical Specification describes a method for determining the skid resistance of paved surface by
measurement of the longitudinal friction coefficient µ
SRM
The method provides a measure of the wet skid resistance properties of a bound surface by measurement of
the longitudinal friction coefficient using a locked wheel with a slip ratio of 0 % (locked wheel: standard), or a
slip ratio of (15 ± 1) % or ABS and a controlled speed. The test tyre is dragged over a pre-wetted pavement
under controlled load and constant speed conditions while the test tyre is parallel to the direction of motion
and to the pavement.
This document covers the operation of the Stuttgarter Reibungsmesser (SRM) of the IVT ETH Zürich.
2 Recommended uses
This method provides a means for the evaluation of the skid resistance of a road surface. It is suitable for use
in the following situations:
 For measurement of road in service, either network monitoring for pavement management, or
measurements on project-level;
 approval of new or renewed pavements;
 research measurements;
 special measurements with separately defined measuring method in winter conditions (ice, snow, frost).
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
friction
resistance to relative motion between two bodies in contact
NOTE The frictional force is the force which acts tangentially in the contact area.
3.2
skid resistance
characterisation of the friction of a road surface when measured in accordance with a standardised method
3.3
wet road skid resistance
property of a trafficked surface that limits relative movement between the surface and the part of a vehicle tyre
in contact with the surface, when lubricated with a film of water
NOTE Factors that contribute to skid resistance include the tyre pressure, contact area, tread pattern, and rubber
composition; the alignment, texture, surface contamination, and characteristics of the road surface; the vehicle speed; and
the weather conditions.
The skid resistance of a road surface in Europe varies seasonally. Generally, wet skid resistance is higher in winter as a
result of the effects of wet detritus and the effects of frost and wear by tyres on microtexture and macrotexture. Wet skid
resistance is lower in summer as a result of dry polishing by tyres in the presence of fine detritus.
The change in skid resistance of a surface in service is affected by the volume of traffic and the composition of the traffic,
i.e. cars, buses, commercial vehicles of different sizes, as the tyres of these vehicles polish and/or wear away the
surfacing material in different ways. The geometry of the road will affect the change in skid resistance. Generally, tyres
polish less on straight roads than on bends.
Where the surface contains aggregate with a coating of binder, e.g. bitumen, resin of Portland cement, the skid resistance
will change as the coating is worn away by tyres.
3.4
longitudinal friction coefficient
LFC
ratio between horizontal force (drag) and vertical load (load) for a braked wheel in controlled conditions
NOTE 1 This is normally a decimal number quoted to two significant figures.
NOTE 2 LFC varies depending on the slip ratio of the device and the operational speed.
3.5
Longitudinal friction coefficient
SRM µ
SRM
ratio under controlled slipping conditions between the horizontal force (that can be activated between the test
wheel and the wet surface) and the vertical wheel load of the Skiddometer
3.6
calibration
periodic adjustment of the offset, the gain and the linearity of the output of a measurement method so that all
the calibrated devices of a particular type deliver the same value within a known and accepted range of
uncertainty, when measuring under ide
...