BS EN 1367-7-2014 Tests for thermal and weathering properties of aggregates Determination of resistance to freezing and thawing of Lightweight aggregates《集料的热性能和风化性能试验 轻集料抗冻结和解冻性的测.pdf

1、BSI Standards PublicationBS EN 1367-7:2014Tests for thermal andweathering properties ofaggregatesPart 7: Determination of resistance tofreezing and thawing of LightweightaggregatesBS EN 1367-7:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1367-7:2014.The

2、UK participation in its preparation was entrusted to TechnicalCommittee B/502/6, Test methods.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible

3、 for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 80003 0ICS 91.100.15Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy

4、 and Strategy Committee on 30 April 2014.Amendments issued since publicationDate Text affectedBS EN 1367-7:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1367-7 April 2014 ICS 91.100.15 English Version Tests for thermal and weathering properties of aggregates - Part 7: Determination of res

5、istance to freezing and thawing of Lightweight aggregates Essais pour dterminer les proprits thermiques et laltrabilit des granulats - Partie 7: Dtermination de la rsistance au gel-dgel des granulats lgers Prfverfahren fr thermische Eigenschaften und Verwitterungsbestndigkeit von Gesteinskrnungen -

6、Teil 7: Bestimmung des Widerstandes von leichten Gesteinskrnungen gegen Frost-Tau-Wechsel This European Standard was approved by CEN on 16 February 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the sta

7、tus 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, G

8、erman). 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, Croa

9、tia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and U

10、nited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No.

11、EN 1367-7:2014 EBS EN 1367-7:2014EN 1367-7:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Principle 4 5 Apparatus and materials .5 6 Sampling .5 7 Test specimens 5 7.1 General 5 7.2 Size of test specimens 5 7.3 Preparation of test specimens .6 8 P

12、rocedure .6 8.1 Soaking .6 8.2 Freezing in air and thawing in water 6 9 Calculation and expression of results .6 10 Test report 7 10.1 Mandatory data 7 10.2 Optional data 7 Bibliography 8 BS EN 1367-7:2014EN 1367-7:2014 (E) 3 Foreword This document (EN 1367-7:2014) has been prepared by Technical Com

13、mittee CEN/TC 154 “Aggregates”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 2014, and conflicting national standards shall be withdrawn at the

14、latest by October 2014. 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. EN 1367 “Tests for thermal and weathering properties of aggreg

15、ates“ consists of the following parts: Part 1: Determination of resistance to freezing and thawing Part 2: Magnesium sulfate test Part 3: Boiling test for “Sonnenbrand Basalt” Part 4: Determination of drying shrinkage Part 5: Determination of resistance to thermal shock Part 6: Determination of resi

16、stance to freezing and thawing in the presence of salt (NaCl) Part 7: Determination of resistance to freezing and thawing of Lightweight Aggregates (the present document) Part 8: Determination of resistance to disintegration of Lightweight Aggregates Test methods for other properties of aggregates a

17、re covered by parts of the following European Standards: EN 932, Tests for general properties of aggregates EN 933, Tests for geometrical properties of aggregates EN 1097, Tests for mechanical and physical properties of aggregates EN 1744, Tests for chemical properties of aggregates EN 13179, Tests

18、for filler aggregate used in bituminous mixtures NOTE This document supersedes the test methods described in EN 130551:2002, Annex C and EN 13055-2:2004, Annex B. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement

19、 this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slo

20、vakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1367-7:2014EN 1367-7:2014 (E) 4 1 Scope This European Standard specifies the reference test method used for type testing, and in case of dispute, for determining the resistance to freezing and thawing of lightweight ag

21、gregates (LWA) in accordance with EN 13055. For other purposes, in particular for factory production control, other methods may be used provided that an appropriate working relationship with the reference method has been established. The test is applicable to LWA with particle size not less than 4 m

22、m and up to a maximum size of 32 mm. 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 ref

23、erenced document (including any amendments) applies. EN 932-1, Tests for general properties of aggregates - Part 1: Methods for sampling EN 932-2, Tests for general properties of aggregates - Part 2: Methods for reducing laboratory samples EN 932-5, Tests for general properties of aggregates - Part

24、5: Common equipment and calibration EN 933-2, Tests for geometrical properties of aggregates - Part 2: Determination of particle size distribution - Test sieves, nominal size of apertures EN 13055-1, Lightweight aggregates - Part 1: Lightweight aggregates for concrete, mortar and grout EN 13055-2, L

25、ightweight aggregates - Part 2: Lightweight aggregates for bituminous mixtures and surface treatments and for unbound and bound applications 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN 13055-1, EN 13055-2 and the following apply. 3.1 test specimen

26、sample used as in single determination when a test method requires more than one determination of a property 3.2 constant mass mass determined by successive weighings performed 1 h apart and not differing by more than 0,1 % Note 1 to entry: In many cases constant mass can be achieved after a test po

27、rtion has been dried for a pre-determined period in a specified oven at (110 5) C. Test laboratories can determine the time required to achieve constant mass for specific types and sizes of sample dependent upon the drying capacity of the oven used. 4 Principle Three test specimens of lightweight ag

28、gregates, having been soaked in water at atmospheric pressure, are subjected to 20 freezethaw cycles. This involves cooling down to 17,5 C in air and then thawing in a water bath at about 20 C. After completion of the freezethaw cycles, the loss of mass of the lightweight aggregates is recorded. BS

29、EN 1367-7:2014EN 1367-7:2014 (E) 5 5 Apparatus and materials 5.1 All apparatus, unless otherwise stated, shall conform to the general requirements of EN 932-5. 5.2 Ventilated drying oven, with forced circulation of adequate capacity. The oven shall be capable of being maintained at (110 5) C. 5.3 Ba

30、lance, capable of weighing test specimens up to 400 g with an accuracy of 0,04 g and test specimens above 400 g with an accuracy of 0,1 g. 5.4 Low temperature cabinet, (upright or chest) with air circulation. The cabinet shall be capable of being maintained at (17,5 2,5) C. 5.5 Test sieves, conformi

31、ng to EN 933-2 shall be used. 5.6 Water, distilled or deionised. 5.7 Container, made from corrosion resistant material with a base area of approximate 0,02 m2and a height not less than 0,1 m. 5.8 Grid, of a suitable size and aperture to prevent the lightweight aggregates floating out of the containe

32、r and to prevent any loss of whole aggregates. 5.9 Water bath, thermostatically controlled to maintain a temperature of (20 3) C. 6 Sampling Sampling and sample reduction shall be carried out in accordance with EN 932-1 and EN 932-2. 7 Test specimens 7.1 General Three individual test specimens shall

33、 be used. The test specimens shall be obtained in accordance with EN 932-2 by sample reduction. Particles of oversize (D) and undersize (d) shall be removed. 7.2 Size of test specimens The quantities for each of the three individual test specimens shall be chosen according to the upper size of the a

34、ggregates as shown in Table 1. Deviations of 5 % in the volume of test specimens are permissible. Table 1 Test specimen volumes required Maximum aggregate size (mm) Approximate volume of the test specimen (l) 8 16 32 0,5 1,0 1,5 BS EN 1367-7:2014EN 1367-7:2014 (E) 6 7.3 Preparation of test specimens

35、 Wash the test specimens on the lower (d) test sieve. Dry the test specimens to constant mass. Allow to cool to ambient temperature and weigh immediately (M1, see Clause 9). Weighing shall be carried out to the following accuracies: Test specimens up to 400 g: to 0,04 g. Test specimens above 400 g:

36、to 0,1 g. 8 Procedure 8.1 Soaking Store the test specimens at atmospheric pressure for (240 15) min in the containers specified in 5.7 at (20 3) C in distilled or deionised water, ensuring that the water covers the test specimens by at least 10 mm. In order to prevent the test specimens floating, th

37、e specimens are kept submerged by a grid as specified in 5.8. 8.2 Freezing in air and thawing in water Remove the test specimens from the containers and allow them to drain on a sieve with a maximum size of 2 mm for about 1 min. Then place them back into the containers spreading them out evenly. Pla

38、ce the containers in the low temperature cabinet, ensuring that the heat is extracted as uniformly as possible from all sides of all test specimens. The distance between each container, and between the containers and the sidewalls of the cabinet, shall not be less than 50 mm. After placing the conta

39、iners in the cabinet, hold the air temperature in the cabinet at (17,5 2,5) C. The containers with the test specimens shall remain in the cabinet for minimum of 240 min. After completion of the freezing cycle, remove the containers from the cabinet, add water to the containers with the test specimen

40、s and store for at least 60 min in a water bath at a temperature of (20 3) C. In order to prevent the test specimens floating, the specimens are kept submerged by a grid as specified in 5.8. Pour off the water from the containers carefully and allow the test specimens to drain for about 1 min. Then

41、start the next freezing cycle. In total 20 freezethaw cycles shall be performed. If it is necessary to interrupt the test, the test specimens should remain in the cabinet at (17,5 2,5) C. On completion of the 20th freezing and thawing cycle, pour the contents of each container into a sieve having an

42、 aperture size that is half the lower size sieve used to prepare the test specimen (e.g. in case of the 8 mm to 16 mm fraction, pour into a test sieve of 4 mm aperture size). Wash and sieve the test specimen on the specified sieve by hand. Dry the residue remaining on the sieve at (110 5) C to const

43、ant mass, cool at ambient temperature and weigh immediately (M2,see Clause 9). 9 Calculation and expression of results Calculate the loss in mass (FLi) of each test specimen in accordance with the following formula: FLi= (M1- M2)/M1 x 100 where BS EN 1367-7:2014EN 1367-7:2014 (E) 7 FLiis the percent

44、age loss in mass of the test specimen; M1is the initial dry mass of the test specimen before freezethaw cycling, in grams; M2is the final dry mass of the test specimen after freezethaw cycling, that is retained on the specified sieve, in grams. Express FLito the nearest 0,01 %. Calculate FL as the m

45、ean of the three individual test results to the nearest 0,1 %. 10 Test report 10.1 Mandatory data The test report shall include the following information: reference to this European Standard; identification of the test sample, including identification of the source, aggregate size and date of sampli

46、ng; sample reception date if different from sampling date; identification of the laboratory; percentage of mass loss after freezing and thawing FL, expressed to the nearest 0,1 %; deviations from the reference method, if any. 10.2 Optional data The test report can include the following information:

47、date of test; reference to the chosen sampling procedure; reference to the chosen sample reduction procedure; percentage of the mass loss after freezing and thawing of the individual test specimens FLi, expressed to the nearest 0,01 %. BS EN 1367-7:2014EN 1367-7:2014 (E) 8 Bibliography 1 EN 1097-5,

48、Tests for mechanical and physical properties of aggregates - Part 5: Determination of the water content by drying in a ventilated oven This page deliberately left blankBSI is the national body responsible for preparing British Standards and other standards-related publications, information and servi

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