EN 15304-2010 en Determination of the freeze-thaw resistance of autoclaved aerated concrete《高压蒸汽养护的加气混凝土抗冻结-解冻的测定》.pdf

1、BS EN 15304:2010ICS 91.100.30NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDDetermination of thefreeze-thaw resistanceof autoclaved aeratedconcreteThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 March2010

2、 BSI 2010ISBN 978 0 580 63431 4Amendments/corrigenda issued since publicationDate CommentsBS EN 15304:2010National forewordThis British Standard is the UK implementation of EN 15304:2010. Itsupersedes BS EN 15304:2007 which is withdrawn.The UK participation in its preparation was entrusted to Techni

3、calCommittee B/523, Prefabricated components of reinforced autoclavedaerated concrete and lightweight aggregate concrete with open structure.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary

4、 provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 15304:2010EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 15304 March 2010 ICS 91.100.30 Supersedes EN 15304:2007English Version Dete

5、rmination of the freeze-thaw resistance of autoclaved aerated concrete Dtermination de la rsistance au gel/dgel du bton cellulaire autoclav Bestimmung des Frost-Tau-Widerstandes von dampfgehrtetem Porenbeton This European Standard was approved by CEN on 23 January 2010. CEN members are bound to comp

6、ly with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this 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 Managem

7、ent Centre or to any CEN member. This European Standard exists in three official versions (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

8、 official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania

9、, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR 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 wor

10、ldwide for CEN national Members. Ref. No. EN 15304:2010: EBS EN 15304:2010EN 15304:2010 (E) 2 Contents Page Foreword 31 Scope 42 Normative references 43 Definitions, symbols and abbreviations 43.1 Superscripts and subscripts 43.2 Symbols 43.2.1 Symbols used in the main body of the standard 43.2.2 Sy

11、mbols specific to Annex A .54 Principle 65 Apparatus .66 Test specimens 66.1 Sample 66.2 Shape and size of the test specimens .76.3 Number of test specimens 76.4 Preparation of test specimens .76.5 Measurement of test specimens and determination of their volume .86.6 Conditioning of test specimens .

12、87 Testing procedure87.1 Freeze-thaw test .87.2 Determination of actual moisture content and dry density of AAC .98 Test results .98.1 Calculation of dry density .98.2 Calculation of moisture content 108.3 Calculation of mass loss 109 Test report . 11Annex A (informative) Determination of the loss i

13、n compressive strength in addition to the loss in mass . 13A.1 General . 13A.2 Test specimens . 13A.2.1 Number of test specimens . 13A.2.2 Preparation of test specimens 13A.3 Testing procedure. 13A.3.1 Freeze-thaw tests 13A.3.2 Conditioning of the test specimens for compression test after the freeze

14、-thaw cycles. 13A.3.3 Compression test 14A.4 Test results 14A.4.1 Calculation of loss of compressive strength of main test specimens 14A.4.2 Determination of mass loss . 15A.4.3 Calculation of dry density 16A.4.4 Calculation of moisture content 16Annex B (informative) Flow chart of freeze-thaw test

15、17Bibliography . 19Figures Figure 1 Cutting scheme .8Figure B.1 Cutting scheme . 17 BS EN 15304:2010EN 15304:2010 (E) 3 Foreword This document (EN 15304:2010) has been prepared by Technical Committee CEN/TC 177 “Prefabricated reinforced components of autoclaved aerated concrete or lightweight aggreg

16、ate concrete with open structure”, the secretariat of which is held by DIN. 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 September 2010, and conflicting national standards shall be withdrawn at

17、 the latest by September 2010. 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. This document supersedes EN 15304:2007. The main change

18、s with respect to EN 15304:2007 are listed below: a) the clause “Definitions, symbols and abbreviations“ has been added; b) the normative references have been updated; c) tolerances have been added to improve the ease of application; d) the calculation of moisture content has been expanded; e) the r

19、equirements for the test report have been expanded; f) the determination of mass loss, calculation of dry density and calculation of moisture content have been clarified. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to i

20、mplement this European Standard: Austria, Belgium, Bulgaria, 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,

21、 Switzerland and the United Kingdom. BS EN 15304:2010EN 15304:2010 (E) 4 1 Scope This document specifies a method of determining the freeze-thaw resistance of autoclaved aerated concrete (AAC) manufactured according to EN 12602 or EN 771-4. 2 Normative references The following referenced documents a

22、re 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 678, Determination of the dry density of autoclaved aerated concrete EN 1353, Dete

23、rmination of moisture content of autoclaved aerated concrete EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machines 3 Definitions, symbols and abbreviations 3.1 Superscripts and subscripts m main test specimen (superscript) r reference test specimen (su

24、perscript) i identification number of the test specimen (subscript) 3.2 Symbols 3.2.1 Symbols used in the main body of the standard ri,0mmeasured initial moist mass of the reference test specimen i immediately after removal from polythene bag (or similar) rni,m measured moist mass of the reference t

25、est specimen i representing the state immediately after completion of n freeze-thaw cycles (should be equal to ri,0m ) rnid,mmeasured oven-dry mass of the reference test specimen i immediately after completion of n freeze-thaw cycles of the main test specimens mi,0m measured initial moist mass of th

26、e main test specimen i immediately after removal from polythene bag (or similar) prior to commencing the freeze-thaw cycles mni,mmoist mass of the main test specimen i immediately after completion of n freeze-thaw cycles mid,0m equivalent oven-dry mass of the main test specimen i immediately after r

27、emoval from the polythene bag (or similar) mnid,m measured oven-dry mass of the main test specimen i immediately after completion of n freeze-thaw cycles BS EN 15304:2010EN 15304:2010 (E) 5 ri,0 moisture content of the reference test specimen i immediately after removal from polythene bag (or simila

28、r) mi,0 moisture content of the main test specimen i immediately after removal from polythene bag or similar (assumed to be equal tori,0 ) mni, moisture content of the main test specimen i immediately after completion of n freeze-thaw cycles (at the end of the freeze-thaw test) miLloss in oven-dry m

29、ass of the main test specimen i after completion of n freeze-thaw cycles 3.2.2 Symbols specific to Annex A rfai,m measured moist mass of the fragments of the saturated (see A.3.2.2) reference test specimen i immediately after the compression test rfdi,m measured oven-dry mass of the fragments of the

30、 saturated (see A.3.2.2) reference test specimen i tested on compression mn2i,m measured moist mass of the saturated (see A.3.2.2) main test specimen i after finalisation of the n freeze-thaw cycles and after water immersion, immediately before testing of compressive strength (if grinding is needed,

31、 before that) mfai,m measured moist mass of the fragments of the saturated (see A.3.2.2) main test specimen i immediately after the compression test mfdi,m measured oven-dry mass of the fragments of the saturated (see A.3.2.2) main test specimen i tested on compression rnai, calculated moisture cont

32、ent of the saturated (see A.3.2.2) reference test specimen i immediately after compression test (assumed to be equal to the moisture content directly before compression test) mnai, calculated moisture content of the saturated (see A.3.2.2) main test specimen i after finalisation of the n freeze-thaw

33、 cycles, immediately after compression test mnci,f individual value of the compressive strength of the main test specimen i after the specified number of cycles (n) and subsequent conditioning according to A.3.2.1 or A.3.2.2, in megapascals rnci,f individual value of the compressive strength of the

34、appropriate reference test specimen i , conditioned in the same manner (according to A.3.2.1 or A.3.2.2) and tested at the same time as the corresponding main test specimen, in megapascals relci,f relative decrease of compressive strength of the main test specimen i as a percentage of the initial co

35、mpressive strength BS EN 15304:2010EN 15304:2010 (E) 6 4 Principle Cubic test specimens (two equal groups consisting of main test specimens and reference test specimens) are cut from products sampled from normal production, saturated in water for (48 1) h, removed and then placed in polythene bags o

36、r similar protecting against drying for (24 1) h to equilibrate. The main test specimens are subjected to repeated freezing at (15 2) C for at least 8 h followed by thawing in an environment of 95 % relative humidity and (20 2) C for at least 8 h. The reference test specimens are stored in a climati

37、c chamber at (20 5) C in conditions that prevent drying of the AAC during storage. After the specified number of freeze-thaw cycles (not less than 15), the mass loss of the main test specimens is determined. The dry density and moisture content is also determined on the reference test specimens. If

38、the loss in compressive strength is also required to be determined, then Annex A should be followed. NOTE Depending on the conditions at the place of use, the number of freeze-thaw cycles and requirements for limit values of loss in mass and compressive strength can be specified by national provisio

39、ns. 5 Apparatus 5.1 Saw with rotating carborundum or diamond blade or similar equipment for cutting test specimens. 5.2 Balance, capable of determining the mass of the test specimens to an accuracy of 0,1 %. 5.3 Callipers, capable of reading the dimensions of the test specimens to an accuracy of 0,1

40、 mm. 5.4 Container, to store the test specimens under water at (20 2) C. 5.5 Feeler gauge, capable of measuring 0,1 mm, (if required) 0,5 mm and 1 mm. 5.6 Room or cabinet for thawing of the main test specimens able to maintain a relative humidity 95 % at (20 2) C. 5.7 Storage room for reference test

41、 specimens able to maintain a relative humidity 95 % at (20 5) C. 5.8 Freezing chamber with internal air circulation capable of maintaining a uniformly distributed temperature of (15 2) C. 5.9 Ventilated drying oven, capable of maintaining a temperature of (105 5) C. 5.10 Straight edge, at least 200

42、 mm long, and a square. 5.11 Compression testing machine, preferably hydraulically operated, which meets the requirements of EN 12390-4. NOTE The room according to 5.6 needs not necessarily be humidity-controlled. Alternatively it is possible to substitute moisture losses by 2 h prior to the end of

43、the thawing period placing the main test specimens in underwater storage for 1 h at (20 5) C and subsequently leaving the test specimens to equilibrate in air for 1 h at (20 5) C before freezing. This procedure is especially appropriate in combination with automatic systems. It should be ensured tha

44、t the starting moisture content is not exceeded. 6 Test specimens 6.1 Sample The sample for the preparation of the test specimens shall be taken in such a manner that it is representative of the product to be investigated, and the test specimens shall be cut from the sample as illustrated in Figure

45、1. BS EN 15304:2010EN 15304:2010 (E) 7 6.2 Shape and size of the test specimens The test specimens shall be cubes with an edge length of (100 2) mm. 6.3 Number of test specimens A test set shall consist of 12 test specimens: 6 main test specimens and 6 reference test specimens. The main test specime

46、ns are exposed to a specified number of freeze-thaw cycles in accordance with 7.1, and their loss in mass (see 8.3) and, if required, their loss in compressive strength due to this exposure is determined (see A.3 and A.4). The reference test specimens are used for determination of the moisture conte

47、nt of the AAC prior to the freeze-thaw test and of the dry density and, if required, for the determination of the (control) compressive strength. NOTE Prior to the test a control specimen is needed for each AAC type to evaluate the freeze-thaw temperature-time relationship of the test equipment, see

48、 7.1. 6.4 Preparation of test specimens The test specimens shall be cut by means of a rotating diamond or carborundum blade or similar equipment. Their surfaces shall not deviate from planeness by more than 0,5 mm. Planeness shall be checked across the two diagonals using a straight edge and, if nec

49、essary, a 0,5 mm feeler gauge. Where test specimens are used for the determination of the compressive strength, their loadbearing surfaces shall not deviate from planeness by more than 0,1 mm and the angle between the loadbearing surfaces and adjacent surfaces shall not deviate from a right angle by more than 1 mm/100 mm. If necessary, the latter shall be checke