1、Bituminous mixtures - Test methodsPart 52: Conditioning to address oxidative ageingPD CEN/TS 12697-52:2017BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 12697-52 July 2017 ICS 93.080.20 E
2、nglish Version Bituminous mixtures - Test methods - Part 52: Conditioning to address oxidative ageing Mlanges bitumineux - Mthodes dessai - Partie 52 : Conditionnement pour lobtention dun vieillissement par oxydation Asphalt - Prfverfahren - Teil 52: Konditionierung, um der oxidativen Alterung Rechn
3、ung zu tragen This Technical Specification (CEN/TS) was approved by CEN on 14 May 2017 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 w
4、hether 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
5、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, Former Yugoslav Republic of Macedonia
6、, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION
7、EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 12697-52:2017 ENational forewordThis Published Document is the UK implementati
8、on of CEN/TS 12697-52:2017.The UK participation in its preparation was entrusted to Technical Committee B/510/1, Asphalt products.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provision
9、s of a contract. Users are responsible for its correct application. The British Standards Institution 2017 Published by BSI Standards Limited 2017ISBN 978 0 580 97593 6ICS 93.080.20Compliance with a British Standard cannot confer immunity from legal obligations.This Published Document was published
10、under the authority of the Standards Policy and Strategy Committee on 30 September 2017.Amendments/corrigenda issued since publicationDate Text affectedPUBLISHED DOCUMENTPD CEN/TS 12697-52:2017TECHNICAL SPECIFICATION SPCIFICATION TECHNIQUE TECHNISCHE SPEZIFIKATION CEN/TS 12697-52 July 2017 ICS 93.08
11、0.20 English Version Bituminous mixtures - Test methods - Part 52: Conditioning to address oxidative ageing Mlanges bitumineux - Mthodes dessai - Partie 52 : Conditionnement pour lobtention dun vieillissement par oxydation Asphalt - Prfverfahren - Teil 52: Konditionierung, um der oxidativen Alterung
12、 Rechnung zu tragen This Technical Specification (CEN/TS) was approved by CEN on 14 May 2017 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 ques
13、tion 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 standar
14、ds 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, Former Yugoslav Republic of Mac
15、edonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALIS
16、ATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. CEN/TS 12697-52:2017 EPD CEN/TS 12697-52:2017CEN/TS 12697-52:2017 (E) 2 Content
17、s Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Principle . 5 5 Procedure A Conditioning of loose asphalt mixture . 5 5.1 Apparatus . 5 5.2 Procedure. 6 5.2.1 General 6 5.2.2 Preparation . 6 5.2.3 Conditioning for short-term ageing potential (Procedure A
18、.1) . 6 5.2.4 Conditioning for long-term ageing potential (Procedure A.2) . 7 5.3 Test report . 7 6 Procedure B Conditioning of compacted asphalt mixture specimens 8 6.1 Apparatus . 8 6.2 Conditioning at ambient air (Procedure B.1) . 9 6.2.1 Procedure. 9 6.2.2 Test Report . 10 6.3 Conditioning under
19、 forced flow with gaseous oxidant (Procedure B.2) 10 6.3.1 Procedure 10 6.3.2 Test report 12 Bibliography . 14 PD CEN/TS 12697-52:2017CEN/TS 12697-52:2017 (E) 3 European foreword This document (CEN/TS 12697-52:2017) has been prepared by Technical Committee CEN/TC 227 “Road material”, the secretariat
20、 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 shall not be held responsible for identifying any or all such patent rights. A list of all parts in the EN 12697 series can be found on the CEN website.
21、 According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, Franc
22、e, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. PD CEN/TS 12697-52:2017CEN/TS 12697-52:2017 (E) 4 1 Scope This Technical
23、Specification specifies two sets of procedures for conditioning of bituminous mixtures in terms of oxidative ageing. Procedures A.1 and A.2 can be applied on loose bituminous mixture before compaction of specimens, procedures B.1 and B.2 on compacted specimens. Material conditioned by this Technical
24、 Specification can be used for further testing to assess the effect of oxidative ageing on characteristics of bituminous mixtures and thus on their durability and recyclability. Alternatively, binder can be extracted from conditioned mixture to assess the effect of oxidative ageing on binder charact
25、eristics taking into account potential effects of mineral aggregates on ageing. This Technical Specification is applicable to bituminous mixtures manufactured in the laboratory or in a mixing plant. Procedures B.1 and B.2 is applicable to specimens from laboratory production or samples taken from th
26、e field. 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
27、any amendments) applies. EN 12697-3, Bituminous mixtures - Test methods for hot mix asphalt - Part 3: Bitumen recovery: Rotary evaporator EN 12697-4, Bituminous mixtures - Test methods - Part 4: Bitumen recovery: Fractionating column EN 12697-5, Bituminous mixtures - Test methods for hot mix asphalt
28、 - Part 5: Determination of the maximum density 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 bit
29、uminous specimens EN 12697-18, Bituminous mixtures - Test methods - Part 18: Binder drainage EN 12697-27, Bituminous mixtures - Test methods - Part 27: Sampling EN 12697-29, Bituminous mixtures - Test method for hot mix asphalt - Part 29: Determination of the dimensions of a bituminous specimen EN 1
30、2697-30, Bituminous mixtures - Test methods for hot mix asphalt - Part 30: Specimen preparation by impact compactor EN 12697-31, Bituminous mixtures - Test methods for hot mix asphalt - Part 31: Specimen preparation by gyratory compactor EN 12697-32, Bituminous mixtures - Test methods for hot mix as
31、phalt - Part 32: Laboratory compaction of bituminous mixtures by vibratory compactor EN 12697-33, Bituminous mixtures - Test methods - Part 33: Specimen prepared by roller compactor EN 12697-35, Bituminous mixtures - Test methods - Part 35: Laboratory mixing PD CEN/TS 12697-52:2017CEN/TS 12697-52:20
32、17 (E) 5 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 ageing alteration of asphalt mixtures over time due to the superposed impact of different environmental conditions (e.g. oxygen, other oxidation agents, UV and moisture) that lead to al
33、tering characteristics of the binder, additive and aggregate component over time Note 1 to entry: Changes in binder characteristics are mainly increasing stiffness and brittleness leading to increased risk of low-temperature and fatigue cracking of asphalt mixtures. Impacts of fine and coarse aggreg
34、ates on the ageing behaviour of asphalt mixtures are still topic of scientific discussion. Ageing can be divided into short-term ageing (STA) during production and compaction of asphalt mixtures and asphalt layers and into long-term ageing (LTA) of compacted pavement layers over the years. 3.2 aspha
35、lt durability maintenance of the structural integrity of compacted material over its expected service-life when exposed to the effects of the environment (water, oxygen, sunlight,) and traffic loading 3.3 pavement durability retention of a satisfactory level of performance over the structures expect
36、ed service-life without major maintenance for all properties that are required for the particular road situation in addition to asphalt durability 4 Principle One of two sets of methods is used for asphalt mixture conditioning. In the first set of methods (Procedures A.1 and A.2), loose asphalt mixt
37、ure is conditioned. The loose mixture is placed into a pan and conditioned within a heating cabinet with forced air ventilation for a specific duration at elevated temperature to accelerate ageing due to oxidation. Additionally pressure can be applied for further acceleration of conditioning. Proced
38、ure A.1 address the short-term ageing potential, procedure A.2 the long-term ageing potential. In the second set of methods (Procedures B.1 and B.2) compacted specimens from bituminous mixtures prepared in the laboratory or coming from the plant or samples from the field are conditioned. Two options
39、 for conditioning are available. Either specimens are placed into a pan and conditioned within a heating cabinet with forced air ventilation for a specific duration at a specific temperature (Procedure B.1), or specimens are placed within a triaxial cell (comparable to triaxial cells used for permea
40、bility tests on soils) and a forced flow of gaseous oxidant agent (ozone enriched compressed air) through the specimen is used to condition the specimen for a specific duration at a specific temperature (Procedure B.2). NOTE Methods B.1 and B.2 result in different results in subsequent testing of co
41、nditioned specimens or extracted binder. 5 Procedure A Conditioning of loose asphalt mixture 5.1 Apparatus 5.1.1 One or more pans with dimensions large enough to ensure that the loose mixture can be spread on it with a thickness of the mixture of up to 60 mm. PD CEN/TS 12697-52:2017CEN/TS 12697-52:2
42、017 (E) 6 To increase the oxidative ageing effect by enhanced air flow through the mixture, a pan with a perforated plate with a maximum mesh size of 0,7 mm can be applied. 5.1.2 Heating cabinet with forced air ventilation able to maintain the conditioning temperature with an accuracy of 1 C. 5.1.3
43、Thermometer, capable of measuring temperatures from room temperature to 180 C, readable to 1 C with an accuracy of 0,5 C. 5.1.4 Watch or timer, accurate and readable to 1 min. 5.1.5 In the case of conditioning of loose mixture by applying temperature and pressure, a device able to maintain the condi
44、tioning temperature and pressure with an accuracy of 1 C for the temperature and of 100 kPa for the pressure. NOTE The Pressure Ageing Vessel (PAV) as described in EN 14769 meets the requirements for conditioning of loose mixture under temperature and pressure. 5.2 Procedure 5.2.1 General Procedure
45、A.1 (for short-term ageing) shall not be applied on loose mix coming from the field as this step has already been taken in the mixing plant. 5.2.2 Preparation Prepare the bituminous mixture according to EN 12697-35, or take samples from the production of a plant according to EN 12697-27. Determine t
46、he maximum density according to EN 12697-5. Preheat the device in which the mixture is to be conditioned and the pan to the conditioning temperature for at least 60 min. 5.2.3 Conditioning for short-term ageing potential (Procedure A.1) Fill the loose mixture into the pan and spread it so that a hom
47、ogeneous layer of mixture with a thickness of (25 5) mm is in the pan. Before placing the pan in the conditioning device, allow the mixture to cool down to the set conditioning temperature. Use the thermometer to check the mixture temperature regularly. When the mixture has reached the conditioning
48、temperature, place the pan into the conditioning device. Condition the mixture for the set conditioning time 10 min, keeping temperature and pressure within accuracy limits. To reduce the danger of binder drainage, it is recommended to carry out preliminary tests according to EN 12697-18 at the desi
49、red conditioning temperature to analyse whether binder drainage occurs. If so, lower the temperature until no binder drainage occurs. Thicknesses between 25 mm and 60 mm are generally used for the loose mix to put in place. To maintain a uniform conditioning it is recommended to stir the mixture at regular time intervals so as to avoid segregation, e.g. each 48 hour. NOTE The method for short-term ageing of laboratory prepared asphalt mixtures suggested by SHRP-A-383 1 report sets a conditioning temperature of 135 C for 4 h. PD CEN/TS 12
