DIN 488-6-2010 Reinforcing steel - Part 6 Assessment of conformity《钢筋 第6部分 合格评定》.pdf

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1、January 2010 Translation by DIN-Sprachendienst.English price group 15No 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).IC

2、S 77.140.15!$t“1810491www.din.deDDIN 488-6Reinforcing steel Part 6: Assessment of conformityEnglish translation of DIN 488-6:2010-01Betonstahl Teil 6: bereinstimmungsnachweisEnglische bersetzung von DIN 488-6:2010-01Aciers pour bton arm Partie 6: valuation de la conformitTraduction anglaise de DIN 4

3、88-6:2010-01SupersedesDIN 488-6:2009-08www.beuth.deDocument comprises pagesIn case of doubt, the German-language original shall be considered authoritative. 09.11 34DIN 488-6:2010-01 A comma is used as the decimal marker. Contents Page Foreword. 3 1 Scope . 4 2 Normative references . 4 3 Terms and d

4、efinitions 4 4 Symbols . 5 5 Assessment of conformity. 6 5.1 General. 6 5.2 Internal production control 6 5.2.1 General. 6 5.2.2 Sampling and testing of finished products 7 5.2.3 Assessment of test results 9 5.2.4 Traceability 14 5.2.5 Determination of long-term quality level 14 5.3 Initial type tes

5、ting . 16 5.3.1 General. 16 5.3.2 Test scope (normal properties and fatigue strength) . 16 5.3.3 Fatigue tests 19 5.3.4 Assessment, reporting and measures 20 5.4 Independent third-party inspection of internal production control and random testing 22 5.4.1 General. 22 5.4.2 Random testing of test spe

6、cimens taken in the works. 23 5.4.3 Assessment, reporting and measures 27 6 Test methods. 28 6.1 Test conditions . 28 6.2 Bars, coils, reinforcing wire and decoiled products. 29 6.3 Welded fabric 29 6.4 Lattice girders . 29 7 Certification . 29 Annex A (normative) Requirements for copper contents 0,

7、60 % 28 mm, 10 test specimens shall be tested with a stress range of 2 a= 145 MPa and 8 test specimens with a stress range of 2 a= 170 MPa. 5.3.3.2 Decoiled products No proof of the fatigue strength is required for the purposes of the initial type testing. 19 DIN 488-6:2010-01 5.3.3.3 Welded fabric

8、The 15 test specimens per diameter combination (longitudinal/transverse bar) according to Table 11 shall be taken from different bars with the same diameter combination and each have one welded intersection. The welded fabric test specimens shall be tested with a maximum stress of 300 MPa. Simplifie

9、d proof of the fatigue strength can be provided as follows. Ten test specimens per diameter combination shall be tested with a stress range of 2 a= 100 MPa and 5 test specimens with a stress range of 2 a= 180 MPa. 5.3.3.4 Lattice girders No proof of the fatigue strength of lattice girders according

10、to this standard is required. 5.3.4 Assessment, reporting and measures 5.3.4.1 General The independent third-party inspection agency shall prepare a report on the initial type testing and initial inspection and forward it to the works. All the individual values and the data specified in DIN 18200 sh

11、all be given in this report. For each test plan, the test results shall be statistically evaluated using suitable methods (e.g. graphically). If an incorrect result occurs for a maximum of one property, the initial type testing of this property may be repeated. In all other cases, the whole test sha

12、ll be repeated. If the results for either the normal properties or the fatigue strength show that the products do not meet the requirements, the relevant reinforcing steel product shall not be certified according to this standard. The manufacturer or fabricator shall take suitable measures to correc

13、t the recognized shortcomings. The measures depend on the type and implications of the recognized shortcomings and may include amendments to the manufacturing, fabrication or test conditions. The reinforcing steel products shall be regarded as manufactured according to the conditions if the results

14、of the initial type testing meet the requirements of the standard. The coil material requirements regarding Agt, Rm/Reand fRare regarded as having been met if all the individual results attain at least the following values: Agt(A) 3,0 %, Agt(B) 5,5 %, Rm/Re(A) 1,06, Rm/Re (B) 1,08, hot rolled and co

15、ld stretched, Rm/Re (B) 1,09, hot rolled with or without heat treatment, fR+15 %. 20 DIN 488-6:2010-01 5.3.4.2 Assessment of fatigue strength For the simplified proof, the initial type testing is regarded as having been successful if for reinforcing steel bars and coils with diameters d 28 mm in the

16、 test with the stress range 2 a= 175 MPa on 10 samples, no fractures occur with less than 1,5 106load cycles and a maximum of 1 fracture with less than 2,0 106load cycles. At least 9 samples shall undergo up to 2,0 106load cycles. In addition, in the 8 test specimens tested with a stress range of 2

17、a= 200 MPa, there shall be no fractures with less than 0,75 106load cycles, a maximum of 1 fracture between 0,75 106and 1,0 106load cycles and a maximum of 2 fractures between 1,0 106and 2,0 106load cycles, if there was 1 fracture with less than 1,0 106load cycles or a maximum of 3 fractures between

18、 1,0 106and 2,0 106load cycles if there was no fracture with less than 1,0 106load cycles, at least 5 samples are to undergo up to 2,0 106load cycles. reinforcing steel bars with diameters d 28 mm in the test with the stress range 2 a= 145 MPa on 10 samples, no fractures occur with less than 1,5 106

19、load cycles and a maximum of 1 fracture with less than 2,0 106load cycles. At least 9 samples shall undergo up to 2,0 106load cycles. In addition, in the 8 test specimens tested with a stress range of 2 a= 170 MPa, there shall be no fractures with less than 0,75 106load cycles, a maximum of 2 fractu

20、res between 0,75 106and 1,0 106load cycles and a maximum of 2 fractures between 1,5 106and 2,0 106load cycles, if there were 2 fractures with less than 1,5 106load cycles or a maximum of 4 fractures between 1,5 106and 2,0 106load cycles if there was no fracture with less than 1,5 106load cycles, at

21、least 4 samples are to undergo up to 2,0 106load cycles. welded fabric in the test with the stress range 2 a= 100 MPa on 10 samples, no fractures occur with less than 1,5 106load cycles and a maximum of 1 fracture with less than 2,0 106load cycles. At least 9 samples shall undergo up to 2,0 106load

22、cycles. In addition, in the 5 test specimens tested with a stress range of 2 a= 180 MPa, there shall be a maximum of 3 fractures between 0,25 106and 0,5 106load cycles and at least 2 samples are to undergo up to 0,5 106load cycles. Within the context of the initial type testing, the fatigue strength

23、 proof can also be provided by suitable statistical methods (e.g. using the acceptance constants in Table 14). In this case, the requirements of DIN 488-1:2009-08, Table 2, shall be met. 21 DIN 488-6:2010-01 Table 14 Acceptance constant k for 2 aas a function of the number (n) of test results (for a

24、 permitted percentage of rejects of 5 % p = 0,95 at a probability of 75 % according to ISO 12491) n k 5 2,46 6 2,34 7 2,25 8 2,19 9 2,14 10 2,10 12 2,05 14 2,00 16 1,98 18 1,95 20 1,93 25 1,90 30 1,87 40 1,83 50 1,81 100 1,76 5.4 Independent third-party inspection of internal production control and

25、random testing 5.4.1 General The independent third-party inspection shall be carried out according to DIN 18200 with the amendments and supplementary specifications listed in this standard. The independent third-party inspection shall generally be carried out quarterly as follows (decoiled products

26、twice a year): a) inspection of the manufacturers or fabricators internal production control system to prove that it is continuing to function satisfactorily; b) taking and testing of test specimens according to 5.4.2; c) if the production subjected to inspection as specified in this standard is sus

27、pended for more than 12 months, the initial type testing as specified in 5.3 shall be repeated when production is resumed. Alternatively, proof of continuous production for the delivery forms specified in this standard can be provided according to other equivalent standards. If production is suspend

28、ed longer than 3 years (the Deutsches Institut fr Bautechnik shall be informed of this by the certification body) the works identification mark loses its validity; d) the initial type testing as specified in 5.3 shall be carried out if production facilities have been substantially modified compared

29、with the conditions under which the initial type testing was performed. 22 DIN 488-6:2010-01 5.4.2 Random testing of test specimens taken in the works 5.4.2.1 Bars, coils and reinforcing wire coils and bars 5.4.2.1.1 Normal properties Proof of the normal properties shall be provided by taking and te

30、sting test specimens as indicated in Tables 15 and 16. Table 15 Type and number of tests for the independent third-party inspection of bars, coils and reinforcing wire bars and coils Frequency Procedure Diameter Normal propertiesa Fatigue strengthbIndependent third-party inspection Suitable diameter

31、s 3 heats per bar/coil diameter 5 test specimens once a year aFor the normal properties, the tests shall be carried out for the characteristics described in Table 16. bNot for reinforcing wire. Table 16 Testing of the normal properties of bars, coils and reinforcing wire bars and coils in the indepe

32、ndent third-party inspection Property ReRm/ReRe,act/Re,nomaAgtAnBend performancebSurface geometry Chemical composition (including Ceq) aFor B500B. bBend or rebend test. Tests for each manufacturing method shall be carried out on randomly taken test specimens. The test specimens shall be selected so

33、that as large a number as possible of diameters are tested over a period of five years. 23 DIN 488-6:2010-01 5.4.2.1.2 Fatigue strength Five test speciments of one diameter of different bars and coils shall be taken once a year. This shall be done in such a way that over a period of 5 years the maxi

34、mum number and spectrum of diameters in the diameter range of the manufacturer is covered. The fatigue test shall be carried out at a maximum stress of 300 MPa and a stress range of: 2 a= 175 MPa for bars and coils of 28 mm diameter, 2 a= 145 MPa for bars of 28 mm diameter. The test is regarded as h

35、aving been successful if a maximum of one test specimen fails with less than 2 106load cycles and 4 test specimens undergo 2 106load cycles. A retest is only possible if a maximum of 2 test specimens fail with less than 2 106load cycles. Then, a further 5 test specimens shall be tested and no sample

36、 shall fail with less than 2 106load cycles. The test is then regarded as having been successful. If the above criteria are not met, corrective measures shall be introduced by the independent third-party inspection agency. 5.4.2.2 Decoiled products 5.4.2.2.1 Normal properties Test specimens shall be

37、 taken and tested from 3 different coils of each fabricated diameter per reinforcing steel grade and straightening method. The test plan shall be as indicated in Table 17. NOTE The test specimens should be selected so that all the machines are covered in a period of 24 months. It shall be ensured th

38、at the material of all the manufacturers and all the fabrication machines are adequately included in the testing. Table 17 Number of samples for the normal properties of decoiled products in the independent third-party inspection Property Fabrication (number of tests per coil) decoiled products Re1

39、Rm/Re1 Re,act/Re,noma1 Agt1 An1 Bend performancebSurface geometry 1 Chemical composition (including Ceq) 0 aFor B500B. bRebend test. 24 DIN 488-6:2010-01 5.4.2.2.2 Fatigue strength Three test specimens shall taken once a year from one straightening machine in every production area. In the first year

40、 of production, the tests shall be carried out within 3 months of the start of production. When taking the samples, adequate account shall be taken of the maximum diameter. Sample taking shall be such that all combinations of manufacturing methods of the initial products and of types of straightenin

41、g are covered over a period of 5 years. The fatigue test shall be carried out at a maximum stress of 300 MPa and a stress range of 2 a= 175 MPa. The test is regarded as having been successful if no test specimen fails with less than 1 106load cycles and a maximum of 1 test specimen fails between 1 1

42、06and 2 106load cycles and 2 test specimens undergo 2 106load cycles. A retest is only possible if a maximum of 2 test specimens fail with less than 2 106load cycles. Then, a further 5 test specimens shall be tested and no sample shall fail with less than 2 106load cycles. The test is then regarded

43、as having been successful. If the above criteria are not met, corrective measures shall be introduced by the third-party organization. 5.4.2.3 Welded fabric 5.4.2.3.1 Normal properties Proof of the normal properties shall be provided by taking and testing the products according to Tables 18 and 19.

44、Table 18 Type and number of tests for the independent third-party inspection of welded fabric Frequency Procedure Diameter Normal propertiesa Fatigue strengthbIndependent third-party inspection One (suitable) dimension (diameter combination) 3 test units per diameter combination 5 test specimens onc

45、e a year aFor the normal properties, the tests shall be carried out for the characteristics described in Table 19. bWith twin bar fabric manufacture, at least 30 % of the test specimens shall be twin bar fabric. Table 19 Testing of the normal properties of welded fabric in the independent third-part

46、y inspection Property AnReRm/ReRe,act/Re,noma AgtFsSurface geometry Dimensions of the welded reinforcing steel fabric aFor B500B. 25 DIN 488-6:2010-01 Tests for each manufacturing method shall be carried out on randomly taken test specimens. The test specimens shall be selected so that all the welde

47、d fabric types, bar diameters, bar combinations and welded fabric dimensions of the manufacturer are covered over a period of 5 years. 5.4.2.3.2 Fatigue strength Five test specimens of reinforcing steels of each manufacturing method shall be taken every year. The test specimens shall be selected so

48、that all the welded fabric types, bar diameters, bar combinations and welded fabric dimensions of the manufacturer are covered over a period of 5 years. The fatigue test shall be carried out at a maximum stress of 300 MPa and a stress range of 2 a= 100 MPa. The test is regarded as having been succes

49、sful if no test specimen fails with less than 1 106load cycles and a maximum of 1 test specimen fails between 1 106and 2 106load cycles and 4 test specimens undergo 2 106load cycles. A retest is only possible if a maximum of 2 test specimens fail with less than 2 106load cycles. Then, a further 5 test specimens shall be tested and no sample shall fail with less than 2 106load cycles. The test is then regarded as having been succe