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prEN 12697-30
Identne prEN 12697-30
Tähtaeg 18.11.2017
Bituminous mixtures - Test methods for hot mix asphalt - Part 30: Specimen preparation by impact compactor
This draft European Standard specifies methods of moulding specimens from bituminous mixtures by impact compaction. Such specimens are primarily used to determine bulk density and other technological characteristics e.g. Marshall stability and flow according to EN 12697-34. This draft European Standard applies to bituminous mixtures (both those made up in a laboratory and those resulting from work site sampling), with not more than 15 % by mass retained on the 22,4 mm sieve and none on the 31,5 mm sieve.
Keel: Inglise

prEN 12697-44
Identne prEN 12697-44
Tähtaeg 18.11.2017
Bituminous mixtures - Test methods for hot mix asphalt - Part 44: Crack propagation by semi-circular bending test
This draft European Standard specifies the Semi-Circular Bending (SCB) test method to determine the tensile strength or fracture toughness of an asphalt mixture for the assessment of the potential for crack propagation. The results of the test can be used to calculate: - the maximum load that the material containing a notch (crack) can resist before failure; - when the presence of a notch is critical. It should be noted that the test only describes a method to determine the resistance to crack propagation of an asphalt mixture. The crack propagation phase describes the second part of failure mechanism during dynamic loading. The first phase, which is the crack initiation phase, is mainly covered by the fatigue test (EN 12697-24).
Keel: Inglise

prEN 12697-5
Identne prEN 12697-5
Tähtaeg 18.11.2017
Bituminous mixtures - Test methods - Part 5: Determination of the maximum density
This draft European Standard specifies test methods for determining the maximum density of a bituminous mixture (voidless mass). It specifies a volumetric procedure, a hydrostatic procedure and a mathematical procedure. The test methods described are intended for use with loose bituminous materials containing paving grade bitumens, modified binders or other bituminous binders used for hot mix asphalt. The tests are suitable for both fresh or aged bituminous materials. Samples may be supplied as loose material or as compacted material; the latter should be separated first. NOTE General guidance on selection of a test procedure to determine the maximum density of a bituminous mixture is given in Annex A.
Keel: Inglise

EN 12697-3:2013/prA1
Tähtaeg 18.11.2017
Bituminous mixtures - Test methods - Part 3: Bitumen recovery: Rotary evaporator
This document describes a test method for the recovery of soluble bitumen from bituminous mixtures used in road, airfield or similar pavements in a form suitable for further testing. The test can be undertaken on either loose or compacted asphalt materials. The procedure is suitable for the recovery of paving grade bitumens, for which materials this European Standard is the reference method. The fractionating column procedure (see EN 12697-4) is the reference method for mixtures containing volatile matter such as cut-back bitumen. For recovery of polymer modified bitumens, the rotary evaporator procedure is recommended.
Keel: Inglise

prEN 15610
Identne prEN 15610
Tähtaeg 18.11.2017
Railway applications - Acoustics - Rail and wheel roughness measurement related to rolling noise generation
This European Standard specifies a direct method for characterizing the surface roughness of the rail and wheel associated with rolling noise ("acoustic roughness"), in the form of a one-third octave band spectrum. This standard describes a method for: a) selecting measuring positions along a track or selecting wheels of a vehicle; b) selecting lateral positions for measurements; c) the data acquisition procedure; d) measurement data processing in order to estimate a set of one-third octave band roughness spectra; e) presentation of this estimate for comparison with limits of acoustic roughness; f) comparison with a given upper limit in terms of a one-third octave band wavelength spectrum; g) the measuring system requirements. It is applicable to: a) the performance testing of reference track sections in relation to the acceptance test for noise emitted by railway vehicles; b) the performance testing of track sections in relation to noise emitted by railway vehicles; c) the acceptance of the running surface condition only in the case where the acoustic roughness is the acceptance criterion; d) the assessment of the wheel surface condition as an input for the acoustic acceptance of brake blocks; e) the assessment of the wheel and rail roughness as input to the calculation of combined wheel rail roughness; f) the diagnosis of wheel-rail noise issues for specific tracks or wheels; g) the assessment of the wheel and rail roughness as input to rolling noise modelling; h) the assessment of the wheel and rail roughness as input to noise source separation methods. It is not applicable to the: a) measurement of roughness using an indirect method; b) direct measurement of combined wheel-rail roughness; c) analysis of the effect of wheel-rail interaction, such as a “contact filter”; d) approval of rail and wheel reprofiling, including rail grinding operations, except for those where the acoustic roughness is specifically the approval criterion (and not the grinding quality criteria as provided in e.g. EN 13231); e) characterisation of track and wheel geometry except where associated with noise generation.
Keel: Inglise