EN 13286-7:2004

Unbound and hydraulically bound mixtures - Part 7: Cyclic load triaxial test for unbound mixtures

This standard specifies two methods for determining the resilient and the permanent behaviour of unbound mixtures under conditions that simulate the physical conditions and stress states of these materials in layers beneath the surface layer of a pavement subjected to moving loads. The two test methods are provided according to the maximum size of particles: - Method A: The Variable Confining Pressure (VCP) method in which the cell pressure is cycled in phase with the axial load. This method applies to unbound mixtures in which all particles pass the 31,5 mm test sieve.

Ungebundene und hydraulisch gebundene Gemische - Teil 7: Dreiaxialprüfung mit zyklischer Belastung für ungebundene Gemische

Diese Europäische Norm legt Verfahren zur Bestimmung sowohl des plastischen als auch des elastischen Spannungs-Verformungsverhaltens von Gesteinskörnungen  fest, wobei der auftretende Beanspruchungszustand (zyklische Beanspruchung) der Tragschichten ohne Bindemittel (ToB) in Straßenbefestigungen simuliert wird.  Diese Verfahren ermöglichen es,  verschiedene Gesteinskorngemische auf ihre Eignung als Tragschichtmaterial einzuschätzen sowie Eingangswerte für die ToB im Rahmen einer analytischen Bemessung von Straßenbefestigungen zu erhalten.
Diese Prüfung ist für zylindrische Probekörper aus Gesteinskörnungen anwendbar, die durch Verdichtung im Labor her-gestellt wurden (gestörte Proben) und deren  maximale  Korngröße kleiner als ein Fünftel des Probekörperdurchmessers ist.
Zwei Prüfverfahren  stehen zur Verfügung:
¾ Verfahren A: Verfahren  mit variablem Zelldruck  (Variable Con-fining Pressure, VCP), bei dem der Zelldruck zyklisch und in Phase mit der Axialspannung aufgebracht wird.
¾ Verfahren B: Verfahren mit  konstantem Zelldruck (Constant Con-fining Pressure, CCP), bei dem nur die Axialspannung zyklisch und der Zelldruck konstant aufgebracht werden.

Mélanges avec ou sans liant hydraulique - Méthodes d'essai - Partie 7: Essai triaxial sous charge cyclique pour mélanges sans liant hydraulique

La présente norme définit des méthodes d'essai permettant de déterminer le comportement réversible ou les déformations permanentes des mélanges non traités dans des conditions simulant les conditions d'état et les états de contrainte de ces matériaux dans les couches de chaussées soumises à des charges roulantes. Ces méthodes d'essai permettent de déterminer des propriétés mécaniques qui peuvent être utilisées pour classer les matériaux suivant leurs performances mécaniques, et pour effectuer des calculs de structures de chaussées.
Ces essais sont réalisés sur des éprouvettes cylindriques de mélange non traité, préparées par compactage en laboratoire. La dimension des plus gros éléments du matériau doit être inférieure à un cinquième du diamètre de l'éprouvette.
Pour l'application des chargements sur l'éprouvette, deux méthodes peuvent être utilisées :
¾ méthode A : Méthode à pression de confinement variable (VCP), dans laquelle la pression dans la cellule triaxiale varie de façon cyclique, en phase avec la charge axiale ;
¾ méthode B : Méthode à pression de confinement constante (CCP), dans laquelle on applique un chargement axial cyclique et une pression de confinement constante.

Nevezane in hidravlično vezane zmesi – 7. del: Triosni preskus s ciklično obremenitvijo nevezanih zmesi

General Information

• Status: Published
• Publication Date: 27-Jan-2004
• Withdrawal Date: 30-Jul-2004
• ICS: 93.080.20 - Road construction materials
• Technical Committee: CEN/TC 227 - Road materials
• Drafting Committee: CEN/TC 227/WG 4 - Hydraulic bound and unbound mixtures (including byproducts and waste materials)
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 02-Dec-2019
• Completion Date: 02-Dec-2019
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Ref Project: SIST EN 13286-7:2004 - Unbound and hydraulically bound mixtures - Part 7: Cyclic load triaxial test for unbound mixtures

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.FLNOLþQRUngebundene und hydraulisch gebundene Gemische - Teil 7: Dreiaxialprüfung mit zyklischer Belastung für ungebundene GemischeMélanges avec ou sans liant hydraulique - Méthodes d'essai - Partie 7: Essai triaxial sous charge cyclique pour mélanges sans liant hydrauliqueUnbound and hydraulically bound mixtures - Part 7: Cyclic load triaxial test for unbound mixtures93.080.20Materiali za gradnjo cestRoad construction materialsICS:Ta slovenski standard je istoveten z:EN 13286-7:2004SIST EN 13286-7:2004en01-junij-2004SIST EN 13286-7:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13286-7January 2004ICS 93.080.20English versionUnbound and hydraulically bound mixtures - Part 7: Cyclic loadtriaxial test for unbound mixturesGraves traitées aux liants hydrauliques et graves nontraitées - Partie 7: Essai triaxial sous charge cyclique pourmélanges sans liant hydrauliqueUngebundene und hydraulisch gebundene Gemische - Teil7: Dreiaxialprüfung mit zyklischer Belastung fürungebundene GemischeThis European Standard was approved by CEN on 14 November 2003.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13286-7:2004: ESIST EN 13286-7:2004

Measurement of specimen deformations.21A.1Measurement system using LVDTs.21A.2Measurement system using linear variable displacement transducers and rings withstrain gages.24Annex B (informative)
Preparation methods.25B.1General.25B.2Specimen conditions.25B.3Method 1 – Compaction by vibrocompression.25B.4Method 2 – Compaction by vibrating hammer.26Annex C (informative)
Guidance on test procedures and ranking of materials.28C.1Purpose.28C.2Experimental stress levels for permanent deformation tests.28C.3Ranking of materials based on resilient behaviour tests.28C.4Ranking of materials based on permanent deformation tests.29C.4.1Procedure.30C.4.2Interpretation.30C.4.3Ranking.31C.4.4Application.31Annex D (informative)
Suggested tables for presentation of test results.33Bibliography.36SIST EN 13286-7:2004

s1r = s1max – s1minkPas3Total radial stress; i.e. the applied confining pressure in the triaxial chamber or thevacuum inside the specimen when no triaxial chamber is used (minor andintermediate principal stress)kPas3min, s3maxMinimum and maximum values of s3 during one load cyclekPas3rResilient radial stress,
s3r = s3max – s3minkPasdDeviator stress,
sd = s1 – s3kPaL0Gauge length for axial displacement, immediately following specimen preparationmmR0Gauge length for radial displacement, immediately following specimen preparationmmLp(N)Permanent axial displacement at cycle N, defined as the displacementaccumulated during the application of a single stress combination, from thebeginning of the first cycle to the end of cycle NmmRp(N)Permanent radial displacement at cycle N, defined as the displacementaccumulated during the application of a single stress combination, from thebeginning of the first cycle to the end of cycle NmmLr(N)Resilient axial displacement at cycle N, defined as the displacement during theunloading part of the cycle (between the point where the applied stresses aremaximum and the end of the cycle)mmRr(N)Resilient radial displacement at cycle N, defined as the displacement during theunloading part of the cyclemme1rResilient or recovered axial strain. At cycle N,
e1r (N)= Lr(N)/ L010–3e1pPermanent axial strain. At cycle N , e1p(N)= Lp(N)/ L010–3e3rResilient or recovered radial strain.At cycle N,
e3r (N)= Rr(N)/ R010–3e3pPermanent radial strain. At cycle N,
e3p (N)= Rp(N)/ R010–3ErResilient modulus,
rrrrrr1rrrrr3313133112222esesesssss-+-+=EWhen s3r = 0, (constant confining pressure) : rrr11es=EMPaNOTECompressive stresses and strains are positive.SIST EN 13286-7:2004

(where L is themeasured displacement in millimetre).Readings of all transducers should be recorded separately.5.7 Other equipmentIt is necessary to provide suitable signal excitation, conditioning, and recording equipment in addition to themeasuring devices for simultaneous recording of axial load, confining pressure and axial and radialdeformations.The recording system shall operate at a frequency, or be of a type, which is able to capture both the minimumand the maximum values of stress applied and strain incurred at the frequency of testing which is to beemployed.5.8 Specimen cap and baseThe specimen cap and base shall be designed to provide drainage from both ends of the specimen. Theyshall be constructed of a rigid, non-corrosive, impermeable material, and each shall, except for the drainageprovision, have a circular plane surface in contact with the porous discs of circular cross section. The diameterof the cap and base shall be equal to or larger than the initial diameter of the specimen. The specimen baseshall be connected to the triaxial compression chamber to prevent lateral motion or tilting, and the specimencap shall be designed such that eccentricity of the loading piston-to-cap contact relative to the vertical axis ofthe specimen does not exceed 1 % of the specimen’s diameter. The cylindrical surface of the specimen baseand cap that contacts the membrane to form a seal shall be smooth and free of scratches.5.9 Porous discsThe specimen shall be separated from the specimen cap and base by rigid porous discs fastened to thespecimen cap and base of a diameter equal to or a little smaller than that of the specimen. The discs shall beregularly checked by passing air or water under pressure through them to determine whether they haveSIST EN 13286-7:2004

another test may be performed using the low stress level.If the specimen
cannot sustain the low stress level, note that the test method is not suitable for this material.7.2.3 Repeated loading for resilient testingApply the appropriate s3min and sd min (same values as during conditioning) and allow sufficient time for strainstabilisation (e.g. a rate of change of less than 10–4 per minute).Then, according to the selected maximum stress level, apply successively the cyclic stress paths defined inTable 3. Apply each cyclic loading during 100 cycles, recording the stress and strain values (as in 7.2.2) atleast at cycle numbers 90 to 100.SIST EN 13286-7:2004
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