1、July 2010 Translation by DIN-Sprachendienst.English price group 10No part of this translation 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 7
2、3.020; 91.100.15!$iV“1705751www.din.deDDIN EN 12371Natural stone test methods Determination of frost resistanceEnglish translation of DIN EN 12371:2010-07Prfverfahren fr Naturstein Bestimmung des FrostwiderstandesEnglische bersetzung von DIN EN 12371:2010-07Mthodes dessai pour pierres naturelles Dte
3、rmination de la rsistance au gelTraduction anglaise de DIN EN 12371:2010-07SupersedesDIN EN 12371:2002-01www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative.1706.10 DIN EN 12371:2010-07 A comma is used as the decimal marker. National f
4、oreword This standard has been prepared by Technical Committee CEN/TC 246 “Natural stones” (Secretariat: UNI, Italy). The responsible German bodies involved in its preparation were the Normenausschuss Materialprfung (Materials Testing Standards Committee) and the Normenausschuss Bauwesen (Building a
5、nd Civil Engineering Standards Committee), Joint Committee NA 062-03-11 GA Naturwerkstein; Anforderungen, Prfverfahren und Terminologie. Amendments This standard differs from DIN EN 12371:2002-01 as follows: a) For technological tests, the minimum number of specimens for the assessment of the effect
6、 of freeze/thaw cycles on the compressive strength has been changed to 21. b) The properties “Thermal shock” and “Load at a dowel hole” have been deleted from Table 1. c) For identification tests, the maximum number of freeze/thaw cycles has been changed to 168 (7.3.2.1). d) The specimens are now to
7、 be turned after 14, 56, 84 and 140 cycles (or less, if convenient) (7.1) . e) For identification tests, the number of control measurements has been increased (7.3). f) Criteria 4 and 5 of the visual inspection have been combined as one (7.3.2.2). Previous editions DIN DVM 2104: 1928-04 DIN 52104-1:
8、 1942x-11,1976-05, 1982-11 DIN EN 12371: 2002-01 DIN 52104-1: 1982-11 DIN 52204: 1933-08 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12371 March 2010 ICS 73.020; 91.100.15 Supersedes EN 12371:2001English Version Natural stone test methods Determination of frost resistance Mthodes dessai p
9、our pierres naturelles Dtermination de la rsistance au gel Prfverfahren fr Naturstein Bestimmung des Frostwiderstandes This European Standard was approved by CEN on 20 February 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving t
10、his 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 Management Centre or to any CEN member. This European Standard exists in three official version
11、s (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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, B
12、ulgaria, 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 and United Kingdom. EUROPEAN COMMITTEE FO
13、R STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12371:2010: EEN 12371:2010 (E) 2 Contents Pag
14、e Foreword 31 Scope 52 Normative references 53 Principle 54 Symbols 55 Apparatus .66 Preparation of the specimens 66.1 Sampling .66.2 Size of specimens 76.2.1 Technological test (Test A) .76.2.2 Identification test (Test B) .76.2.3 Putting reference marks on the specimens 76.3 Monitoring core temper
15、ature 76.4 Drying the specimens .86.5 Immersion of the specimens 86.6 Determination of the apparent volume 86.7 Number of cycles .86.7.1 Technological test (Test A) .86.7.2 Identification test (Test B) .87 Test procedure .87.1 Arrangement of the specimens in the freezing tank 87.2 Description of the
16、 freezing and thawing cycles .97.3 Control measurements to determine the freeze/thaw resistance .97.3.1 Technological test (Test A) .97.3.2 Identification test (Test B) 108 Expression of the results . 118.1 Technological test (Test A) 118.2 Identification test (Test B) 119 Test report . 12Annex A (i
17、nformative) Test cycles 13Bibliography . 15DIN EN 12371:2010-07 EN 12371:2010 (E) 3 Foreword This document (EN 12371:2010) has been prepared by Technical Committee CEN/TC 246 “Natural stones”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national sta
18、ndard, either by publication of an identical text or by endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. This document supersedes EN 12371:2001. This European Standard is one of the series of standards for tests on n
19、atural stone. Test methods for natural stone consist of the following European Standards: EN 1925 Natural stone test methods Determination of water absorption coefficient by capillarity EN 1926 Natural stone test methods Determination of uniaxial compressive strength EN 1936 Natural stone test metho
20、ds Determination of real density and apparent density, and of total and open porosity. EN 12370 Natural stone test methods Determination of resistance to salt crystallisation EN 12372 Natural stone test methods Determination of flexural strength under concentrated load EN 12407 Natural stone test me
21、thods Petrographic examination EN 13161 Natural stone test methods Determination of flexural strength under constant moment EN 13364 Natural stone test methods Determination of the breaking load at dowel hole EN 13373 Natural stone test methods Determination of geometric characteristics on units EN
22、13755 Natural stone test methods Determination of water absorption at atmospheric pressure EN 14066 Natural stone test methods Determination of resistance to ageing by thermal shock EN 14146 Natural stone test methods Determination of the dynamic modulus of elasticity (by measuring the fundamental r
23、esonance frequency) EN 14147 Natural stone test methods Determination of resistance to ageing by salt mist EN 14157 Natural stone test methods Determination of the abrasion resistance EN 14158 Natural stone test methods Determination of rupture energy EN 14205 Natural stone test methods Determinatio
24、n of Knoop hardness EN 14231 Natural stone test methods Determination of the slip resistance by means of the pendulum tester EN 14579 Natural stone test methods Determination of sound speed propagation EN 14580 Natural stone test methods Determination of static elastic modulus EN 14581 Natural stone
25、 test methods Determination of linear thermal expansion coefficient It is intended that other ENs should call up this European Standard as the basis of evaluation of conformity. DIN EN 12371:2010-07 EN 12371:2010 (E) 4 NOTE It is not intended that all natural stones products should be subjected regu
26、larly to all the listed tests. Specifications in other standards should call up only relevant test methods. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cr
27、oatia, 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 and United Kingdom. DIN EN 12371:2010-07 EN 12371:
28、2010 (E) 5 1 Scope This European Standard specifies a method to assess the effect of freeze/thaw cycles on natural stones (see EN 12670 for terminology, and EN 12440 for denomination). The standard contains provision for both a shorter technological test (Test A) to assess the effect of freeze/thaw
29、cycles on the relevant performance characteristics and an identification test (Test B). NOTE Some marbles, as defined in EN 12440, undergo changes in physical properties as a result of the test conditions rather than the freeze/thaw cycles. In these cases, additional tests (for example EN 14066) sho
30、uld be applied. 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) applies. EN 1926, N
31、atural stone test methods Determination of uniaxial compressive strength EN 12372, Natural stone test methods Determination of flexural strength under concentrated load EN 13161, Natural stone test methods Determination of flexural strength under constant moment EN 13364, Natural stone test methods
32、Determination of the breaking load at dowel hole EN 14066, Natural stone test methods Determination of resistance to ageing by thermal shock EN 14146, Natural stone test methods Determination of the dynamic modulus of elasticity (by measuring the fundamental resonance frequency 3 Principle The frost
33、 resistance of natural stone units is determined by a test comprising cycles of freezing in air and thawing in water. 4 Symbols Md0mass of the dry specimen before immersion in water and before starting the cycles, in grams Ms0mass of the saturated specimen after immersion in water and before startin
34、g the cycles, in grams Mh0apparent mass of the specimen in water before starting the cycles, in grams Mdnmass of the dry specimen at Nc cycles, in grams Msnmass of the saturated specimen at Nc cycles, in grams Mhnapparent mass of the specimen in water at n cycles, in grams Vb0apparent volume of the
35、specimen before freezing, in millilitres Vbnapparent volume of the specimen at Nc cycles, in millilitres DIN EN 12371:2010-07 EN 12371:2010 (E) 6 Vbchange in apparent volume of the specimen, as a percentage E0dynamic elastic modulus of the dry specimen before freezing, in Megapascals Endynamic elast
36、ic modulus of the dry specimen at n cycles, in Megapascals E change in dynamic elastic modulus, as a percentage Nc number of cycles completed before failure for identification test 5 Apparatus 5.1 A freezing tank of sufficient capacity to hold the required number of specimens, possibly with an autom
37、atic control system to programme the freezing and thawing cycles within the chamber with a tolerance of 2,0 C. NOTE The tests can be executed manually if no suitable automated system is available. 5.2 A temperature recording system capable of measuring temperature to + 0,1 C. 5.3 A device for measur
38、ing dynamic elastic modulus in accordance with EN 14146. 5.4 A weighing instrument with an accuracy of at least 0,01 % of the mass to be weighed. 5.5 A ventilated oven capable of maintaining a temperature of (70 5) C. 6 Preparation of the specimens 6.1 Sampling The sampling is not the responsibility
39、 of the test laboratory except where specially requested. For technological tests the number of specimens shall be in accordance with the appropriate standard (see also Table 1). Two sets of specimens are required, one to be tested after being subjected to the freeze/thaw cycles, the other to be tes
40、ted without freeze/thaw cycling. Each set shall be randomly selected from the body of stone to be tested. In addition, one extra specimen is used to monitor the temperature of the specimens. For an identification test, seven specimens, which are considered representative of the body of stone being t
41、ested, shall be selected. Use one of the seven specimen to monitor the core temperature. DIN EN 12371:2010-07 EN 12371:2010 (E) 7 Table 1 Summary of the application of the freeze/thaw test Technological test (Test A) Identification test (Test B) Flexural strength Compressive strength Specimen size i
42、n mm 50 50 300 (see Note 1 and 3) (see Note 2) 50 50 300 (see Note 3) Minimum number of specimens 21 21 7 NOTE 1 Specimen size according to EN 12372 or EN 13161. NOTE 2 Specimen size according to EN 1926. NOTE 3 For specific stones with tendency to split (shale, phyllite, ), the thickness can be red
43、uced to the thickness of use with a minimum of 13 mm. If the thickness is less than the minimum thickness required in EN12372 or EN 13161, the span for testing the flexural strength should be equal to (180 1) mm6.2 Size of specimens 6.2.1 Technological test (Test A) Where the test is carried out to
44、determine the effect of freeze/thaw cycles on performance characteristics the specimens shall be in accordance with the appropriate standard. The appropriate standards are EN 12372 or EN 13161 for flexural strength, EN 13364 for breaking load at a dowel hole, EN 14066 for resistance to thermal shock
45、, and EN 1926 for compressive strength. 6.2.2 Identification test (Test B) The specimens are in the form of rectangular prisms with dimensions of 50 mm 50 mm 300 mm (except for Note 3 in Table 1). The long axis shall be parallel to the anisotropy planes. 6.2.3 Putting reference marks on the specimen
46、s Initial defects and all irregularities have to be marked with indelible marks on the specimens. To ensure that the various dynamic elastic modulus measurements performed before and after the freeze/thaw cycles are done at the same points on the specimens, make indelible marks, in the form of point
47、s, on the relevant faces of the specimens. Trace an indelible line at the point of the axis of the two supports on which the specimens will be placed during the determination of the dynamic elastic modulus (in flexural mode). 6.3 Monitoring core temperature One specimen shall be fitted with a device
48、 (for example a thermocouple) to measure the temperature of the specimen during freezing and thawing cycles. The device shall be placed in a hole that is drilled parallel to the long axis of the specimen. The diameter of this hole has to be appropriate to the diameter of the device. The centre of the hole shall be equidistant from the edges of the specimen to a minimum depth of 50 mm from the top. If
