EN 12697-24:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Asphalt - Prüfverfahren für Heißasphalt - Teil 24: Beständigkeit gegen ErmüdungMélanges bitumineux - Méthodes d'essai pour mélange hydrocarboné à chaud - Partie 24: Résistance à la fatigueBituminous mixtures - Test methods for hot mix asphalt - Part 24: Resistance to fatigue93.080.20Materiali za gradnjo cestRoad construction materialsICS:Ta slovenski standard je istoveten z:EN 12697-24:2012SIST EN 12697-24:2012en,fr,de01-september-2012SIST EN 12697-24:2012SLOVENSKI
STANDARDSIST EN 12697-24:2004+A1:20071DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12697-24
May 2012 ICS 93.080.20 Supersedes EN 12697-24:2004+A1:2007English Version
Bituminous mixtures - Test methods for hot mix asphalt - Part 24: Resistance to fatigue
Mélanges bitumineux - Méthodes d'essai pour mélange hydrocarboné à chaud - Partie 24: Résistance à la fatigue Asphalt - Prüfverfahren für Heißasphalt - Teil 24: Beständigkeit gegen Ermüdung This European Standard was approved by CEN on 23 March 2012.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
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Two-point bending test on trapezoidal shaped specimens . 22A.1Principle . 22A.2Equipment . 23A.3Specimen preparation . 23A.4Procedure . 26A.5Calculation and expression of results . 27A.6Test report . 28A.7Precision . 28Annex B (normative)
Two-point bending test on prismatic shaped specimens . 30B.1Principle . 30B.2Equipment . 30B.3Specimen preparation . 31B.4Procedure . 31B.5Calculation and expression of results . 32B.6Test report . 34B.7Precision . 34Annex C (normative)
Three-point bending test on prismatic shaped specimens . 35C.1Principle . 35C.2Equipment . 35C.3Specimen preparation . 36C.4Procedure . 36SIST EN 12697-24:2012

Four-point bending test on prismatic shaped specimens . 42D.1Principle. 42D.2Equipment . 44D.3Specimen preparation . 45D.4Procedure . 46D.5Calculation and expression of results . 48D.6Test report . 48D.7Precision. 48Annex E (normative)
Indirect tensile test on cylindrical shaped specimens . 49E.1Principle. 49E.2Equipment . 49E.3Specimen preparation . 52E.4Procedure . 53E.5Calculation and reporting of results . 53E.6Test report . 56E.7Precision. 56Bibliography . 57
1) In preparation. SIST EN 12697-24:2012

a) to rank bituminous mixtures on the basis of resistance to fatigue;
b) as a guide to relative performance in the pavement;
c) to obtain data for estimating the structural behaviour of the road; and
d) to judge test data according to specifications for bituminous mixtures. Because this European Standard does not impose a particular type of testing device, the precise choice of the test conditions depends on the possibilities and the working range of the device used. For the choice of specific test conditions, the requirements of the product standards for bituminous mixtures need to be respected. The applicability of this document is described in the product standards for bituminous mixtures. Results obtained from different test methods or using different failure criteria are not assured to be comparable. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12697-6, Bituminous mixtures — Test methods for hot mix asphalt — Part 6: Determination of bulk density of bituminous specimens
EN 12697-8, Bituminous mixtures — Test methods for hot mix asphalt — Part 8: Determination of void characteristics of bituminous specimens EN 12697-26:2011, Bituminous mixtures — Test methods for hot mix asphalt — Part 26: Stiffness EN 12697-27, Bituminous mixtures — Test methods for hot mix asphalt — Part 27: Sampling EN 12697-29, Bituminous mixtures — Test methods for hot mix asphalt — Part 29: Determination of the dimensions of a bituminous specimen EN 12697-31, Bituminous mixtures — Test methods for hot mix asphalt — Part 31: Specimen preparation by gyratory compactor EN 12697-33, Bituminous mixtures — Test methods for hot mix asphalt — Part 33: Specimen prepared by roller compactor 3 Terms, definitions, symbols and abbreviations For the purposes of this document, the following terms and definitions, symbols and abbreviations apply. SIST EN 12697-24:2012

Note 1 to entry: A loading mode could be constant deflection level, or constant force level, and or any other constant loading condition. 3.2 Two-point bending test on trapezoidal specimens 3.2.1 constant relative to maximum strain constant that enables the head displacement z of the trapezoidal specimen of dimensions [B, b, e, h], to which a bending strain level ε is applied, to be converted into maximum strain Note 1 to entry: The following formulae express Kε and its relationship with the parameters mentioned above: εε=×zK (1) ()[]bBBbBBbhbbBBKln)()()(×+−×−××−×=2222234ε (2) 3.2.2 Symbols Where a strain of 1 microstrain (µstrain) is equal to 10−6 by convention, the symbols are as follows: i is the index of the specimen for an element test (varies from 1 to n); hi is the height, in metres (m); Bi is the large base, in metres (m); bi is the small base, in metres (m); ei is the thickness, in metres (m); vi is the void content of the specimen i by geometric method, in percent (%); Kεi is the constant, relative to the maximum strain, in inverse metres (m–1); SIST EN 12697-24:2012

EN 12697-26); bi is the base, in millimetres (mm); hi is the height, in millimetres (mm); ei is the width, in millimetres (mm). 3.3.2 Symbols Where a strain of 1 microstrain (µstrain) is equal to 10–6 by convention, the symbols are as follows: 3.3.2.1 Sample i hI is the height, in millimetres (mm); bI is (A) small base or (B) base, in millimetres (mm); eI is the thickness, in millimetres (mm); mI is the mass, in grams (g); vi% is the vacuum, achieved by the geometric method as a proportion of atmospheric pressure, in percent (%); Kσi is the constant for consideration of the geometry of specimen at constant strength, in inverse millimetres (mm–1). 3.3.2.2 Strength at head and greatest tension at specimen i at level of tension εj max Pij is the amplitude of the strength with which the head is applied, in Newtons (N); σj max is the greatest relative tension of the specimen, corresponding to the strength, with which the head is applied. 3.3.2.3 Fatigue life of a specimen i at the level of tension σj max Nij is the fatigue life. 3.3.2.4 Fatigue life relative to sample i at the strain level εj Nij is the conventional fatigue life. 3.3.2.5 Fatigue line pσ is the slope of fatigue line ln(σj max) = f (ln(Nij)); 6σˆ is the tension corresponding to 106 cycles, in megapascals (MPa); yxσs is the estimation of the residual standard deviation of the natural logarithms of fatigue lives; 6σ∆ˆ is the confidence of 6σˆfor a probability of 95 %; SIST EN 12697-24:2012

is the density of dissipated energy at cycle x, in megajoules per cubic metre (MJ/m3); EXT is the instant extensometer signal, in millimetres (mm); L is the distance between supports, in millimetres (mm); MD is the dynamic modulus, in megapascals (MPa); N is the number of cycles at the end of the test; P is the instant load, in megapascals (MPa); W is the total density of dissipated energy throughout the whole test, in megajoules per cubic metre (MJ/m3); b is the width of the specimen, in millimetres (mm); SIST EN 12697-24:2012

Note 1 to entry: A loading mode could be constant deflection level, or constant force level, and or any other constant loading condition
3.5.4 test condition k set of conditions under which a specimen is tested Note 1 to entry: This set contains the applied frequency f, the test temperature Θ and the loading mode (constant deflection, or constant force, and or constant dissipated energy per cycle. SIST EN 12697-24:2012

is the estimate of the slope, p; A0 is the estimation of the level of loading, Q; B is the width of the prismatic specimen, in millimetres (mm); D is the maximum nominal grain size of the mixture being tested, in millimetres (mm); H is the height of the prismatic specimen, in millimetres (mm); L is the effective length of the prismatic specimen, in millimetres (mm); Ltot is the total length of the prismatic specimen, in millimetres (mm); Mbeam is the mass of the whole beam without the masses of the mounted clamps, in grams (g); Mclamps is the masses of the two inner clamps, including the mass of the adhesive, and the mass of the load frame between the load cell and the jack, in grams (g); Msensor is the mass of the moving parts of the sensor, in grams (g); Meq is the equivalent mass, in grams (g); Ni,j,k
is the length of life for specimen number i, the chosen failure criteria j and the set of test conditions k is cycles; SIST EN 12697-24:2012
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