DIN EN 1367-4-2008 Tests for thermal and weathering properties of aggregates - Part 4 Determination of drying shrinkage English version of DIN EN 1367-4 2008-06《集料热和风化性能试验 第4部分 干燥收.pdf

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1、June 2008DEUTSCHE NORM English price group 10No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 91.100.15!$Nd“1439365www.

2、din.deDDIN EN 1367-4Tests for thermal and weathering properties of aggregates Part 4: Determination of drying shrinkageEnglish version of DIN EN 1367-4:2008-06Prfverfahren fr thermische Eigenschaften und Verwitterungsbestndigkeit vonGesteinskrnungen Teil 4: Bestimmung der TrockenschwindungEnglische

3、Fassung DIN EN 1367-4:2008-06SupersedesDIN EN 1367-4:1998-05www.beuth.deDocument comprises 16 pagesDIN EN 1367-4:2008-06 2 National foreword This standard has been prepared by Technical Committee CEN/TC 154 “Aggregates” (Secretariat: BSI, United Kingdom). The responsible German body involved in its

4、preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Technical Committee NA 062-03-13 AA Gesteinskrnungen, Prf-verfahren, Petrographie, Probenahme und Przision. Amendments This standard differs from DIN EN 1367-4:1998-05 as follows: a) The field of application

5、relating to type testing and in cases of dispute has been given in more detail. b) The standard has been editorially revised. Previous editions DIN EN 1367-4: 1998-05 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1367-4 March 2008 ICS 91.100.15 Supersedes EN 1367-4:1998 English Version Tests

6、for thermal and weathering properties of aggregates - Part 4: Determination of drying shrinkage Essais pour dterminer les proprits thermiques et laltrabilit des granulats - Partie 4: Determination du retrait au schage Prfverfahren fr thermische Eigenschaften und Verwitterungsbestndigkeit von Gestein

7、skrnungen - Teil 4: Bestimmung der Trockenschwindung This European Standard was approved by CEN on 4 February 2008. 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

8、 alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN 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 b

9、y translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

10、Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NOR

11、MUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1367-4:2008: EEN 1367-4:2008 (E) 2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions

12、.4 4 Principle5 5 Sampling.5 6 Apparatus .5 7 Materials .6 8 Preparation of test subsamples 6 9 Preparation of test prisms .7 10 Procedure .10 11 Calculation and expression of results 10 12 Test report 11 Annex A (informative) Conditions of larger aggregate size .12 Annex B (informative) Precision 1

13、3 Bibliography 14 DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 3 Foreword This document (EN 1367-4:2008) has been prepared by Technical Committee 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 publicati

14、on of an identical text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn at the latest by September 2008. 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

15、shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1367-4:1998. Testing in accordance with this standard is intended to provide information to assist in judging the performance of aggregates subject to weathering action. This standard is intended

16、 to identify aggregates with high moisture sensitivity which in concrete may cause excessive cracking, deflection and loss of durability. This test may not be suitable for lightweight aggregates. This European Standard is one of a series of tests for thermal and weathering properties of aggregates a

17、s listed below. EN 1367-1, Tests for thermal and weathering properties of aggregates - Part 1: Determination of resistance to freezing and thawing EN 1367-2, Tests for thermal and weathering properties of aggregates - Part 2: Magnesium sulfate test EN 1367-3, Tests for thermal and weathering propert

18、ies of aggregates - Part 3: Boiling test for “Sonnenbrand basalt“ EN 1367-5, Tests for thermal and weathering properties of aggregates - Part 5: Determination of resistance to thermal shock Test methods for other properties of aggregates will be covered by Parts of the following European Standards:

19、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 for filler aggregate used in bituminous mixtures Accordin

20、g to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

21、Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 4 1 Scope This standard describes the reference method used for type testing and in cases of dispute, for dete

22、rmining the effect of aggregates on the drying shrinkage of concrete. For other purposes, in particular factory production control, other methods may be used provided an appropriate working relationship with the reference method has been established. This standard is based on the testing of concrete

23、s of fixed mix proportions and aggregates of 20 mm maximum size. NOTE 1 Guidance on the use of larger size is given in Annex A. Precision data is not available for variations in size and for variations in the water content of the test concrete. NOTE 2 In those cases where the drying shrinkage of a s

24、ource of coarse aggregate only or a source of fine aggregate (sand) only are required, the other component to be used should be, respectively, a fine or coarse aggregate of known low shrinkage. NOTE 3 Aggregates with high water demand and/or porosity may in a concrete with a fixed water content resu

25、lt in a mix with insufficient workability to allow full compaction of the test specimens. This is likely to occur with aggregates combinations having a composite water absorption value greater than 3,5% or oven-dried particle densities less than 2,45 Mg/m (e.g. for recycled aggregates). In such inst

26、ances a variation of the method (without precision data) may be carried out by one of the following changes to the concrete mix: (a) use of aggregates in the saturated and surface dry condition. (b) use of water-reducing admixture. A note on the details of any modification to the mix design should b

27、e included with the test report. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) ap

28、plies. EN 197-1 Cement - Part 1: Composition, specifications and conformity criteria for common cements 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,

29、 Tests for general properties of aggregates - Part 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 3 Terms and definitions For the purposes of this document, th

30、e following terms and definitions apply. 3.1 laboratory sample sample intended for laboratory testing NOTE The laboratory sample is generally the penultimate stage in a multi-stage sampling procedure. DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 5 3.2 subsample sample obtained from sampling increments o

31、r a bulk sample by means of a sample reduction procedure 3.3 test portion sample used as a whole in a single test 4 Principle The aggregate under test is mixed with cement and water and cast into prisms of specified dimensions. The prisms are subjected to wetting followed by drying at (110 5) C and

32、the change in length from the wet to the dry state is determined. The excess drying shrinkage of the concrete is attributed to the aggregate, and is expressed as the average change in length of the prisms, as a percentage of their final dry lengths. 5 Sampling The laboratory sample to be used for th

33、e test shall be taken in accordance with EN 932-1. 6 Apparatus Unless otherwise stated, all apparatus shall conform to the general requirements of EN 932-5. 6.1 Sample divider, of size appropriate to the maximum particle size to be handled or, alternatively, a flat shovel and a clean, hard horizonta

34、l surface, e.g. a metal tray for use in quartering. 6.2 Test sieves, conforming to EN 933-2, appropriate to the sizes of aggregate to be tested. 6.3 Balance, of minimum capacity 5 kg and minimum accuracy of 0,1 %. 6.4 Single or gang moulds, suitable for casting three concrete prisms of dimensions (2

35、00 2) mm x (50 2) mm x (50 2) mm with 8 mm diameter stainless steel balls or hemispherical buttons or recessed inserts, securely fixed to the centre of the inside faces of the 50 mm x 50 mm ends of the mould. 6.5 Vibrating table, capable of fully compacting the concrete in the moulds. 6.6 Measuring

36、apparatus, incorporating a dial gauge with scale divisions of 0,002 mm and having a maximum error of 0,002 mm in any half revolution. This gauge shall be rigidly mounted in a measuring frame and shall have a recessed end which can be located on 8 mm diameter stainless steel balls or hemispherical bu

37、ttons or inserts cemented in the prisms (see 9.3). The other end of the frame shall have a similar recessed seating, which can be located upon balls in the opposite end of the prisms. A reference alloy steel rod of low thermal expansion, (205 1) mm long, with 6 mm hemispherical ends shall be used as

38、 a standard of length against which the readings of the gauge can be tested, thus enabling corrections to be made for any changes in the dimensions of the apparatus between successive measurements of the prisms. The reference rod shall be marked so that the same end can be kept uppermost during meas

39、urements. NOTE Alternative measuring devices can be used in place of the dial gauge, e.g. linear variable differential transducers, provided they are of at least equal performance and fitted with seatings compatible with the stainless steel balls or inserts as appropriate. DIN EN 1367-4:2008-06 EN 1

40、367-4:2008 (E) 6 6.7 Ventilated oven, thermostatically controlled and capable of maintaining temperatures of (50 2) C and (110 5) C. NOTE Different ovens for each temperature range can be used. 6.8 Thermometer, capable of measuring the oven temperatures of 50 C and 110 C to a precision of 0,5 C. 6.9

41、 Desiccators, large enough to contain three concrete prisms 200 mm x 50 mm x 50 mm containing anhydrous silica gel as the desiccant. 6.10 Trays, that are capable of being heated in the ventilated oven without damage or change in mass. 6.11 Timing device, such that the full range of timed periods can

42、 be measured to an accuracy of 1 min. 6.12 Mechanical mixer, capable of mixing all constituents thoroughly within the specified time limits. NOTE Alternatively hand mixing can be used. 6.13 Flat impervious cover sheet, of suitable size, of rubber, polythene or steel. 7 Materials 7.1 Cement, conformi

43、ng to type CEM 1 Class 42,5 of EN 197-1. 7.2 Water, distilled or de-ionised. 7.3 8 mm diameter stainless steel balls or hemispherical buttons or inserts (see 6.4). 8 Preparation of test subsamples 8.1 Reduce the laboratory samples of the coarse and fine aggregate (sand) by the procedure specified in

44、 EN 932-2 to produce subsamples that can be sieved after oven drying to give approximately 1 600 g of 10 mm to 20 mm size fraction, 800 g of 4 mm to 10 mm size fraction and 1 300 g of 0 mm to 4 mm fine aggregate (sand). 8.2 Spread the subsamples on shallow trays and dry for at least 16 h in the oven

45、 (see 6.7) set at (50 2) C. 8.3 Reject all oversize material from the fine aggregate (sand) and all oversize and undersize material from each of the two coarse aggregate subsamples. DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 7 9 Preparation of test prisms 9.1 Proportioning Cast three test prisms, usin

46、g the amount of cement, aggregates and water required to make the three prisms as specified in Table 1. Table 1 - Masses of constituents in test prisms Constituent Mass g Cement Coarse aggregate (20 mm to 4 mm) and fine aggregate (sand) Water 550 5 3 300 5 300 5 The coarse aggregate and fine aggrega

47、te (sand) shall comply with the limits specified in Table 2 and the grading curves shown in Figure 1. DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 8 Table 2 - Grading limits of aggregate in concrete prisms Sieve size Overall grading limits mm Lower% passing Preferred% passing Upper% passing 20 16 14 12,

48、5 11.2 10 8 5,6 4 2 1 0,5 0,25 0,125 100 76 65 60 56 50 41 32 26 20 14 10 5 0 100 82 69 64 60 55 46 38 30 22 17 12 8 2 100 92 83 78 76 70 61 52 43 33 25 18 12 6 DIN EN 1367-4:2008-06 EN 1367-4:2008 (E) 9 Key X Sieve size mm A Lower limit Y Cumulative % passing B Preferred C Uper limit Figure 1 - Gra

49、ding limits for aggregate in concrete prisms 9.2 Mixing and casting 9.2.1 Mix the concrete for the three prisms using a suitable small laboratory mechanical mixer. Initially mix the cement and fine aggregate (sand) dry for 2 min minimum. Add the coarse aggregate and mix dry until the mixture is uniform. Add the water and mix for 2 min to 3 min. 9.2.2 Transfer the concrete to the moulds, single or ganged, and use a vibrating table to compact the concrete in the moulds in two approximately equal layers for sufficient time to