1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58concreteThe European Standard EN 679:2005 has the status of a British StandardICS 91.100.30Determin
2、ation of the compressive strength of autoclaved aerated BRITISH STANDARDBS EN 679:2005BS EN 679:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2005 BSI 30 September 2005ISBN 0 580 46612 4A list of organizations represented o
3、n this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by us
4、ing the “Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity fr
5、om legal obligations.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 7 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comment
6、s aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.National forewordThi
7、s British Standard is the official English language version of EN 679:2005. It supersedes BS EN 679:1994 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee B/523, Prefabricated components of reinforced autoclaved aerated concrete and lightweight aggregate
8、 concrete with open structure, which has the responsibility to:EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 679 July 2005 ICS 91.100.30 Supersedes EN 679:1993 English version Determination of the compressive strength of autoclaved aerated concrete Dtermination de la rsistance la compression
9、du bton cellulaire autoclav Bestimmung der Druckfestigkeit von dampfgehrtetem Porenbeton This European Standard was approved by CEN on 3 June 2005. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of
10、 a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A versio
11、n in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia
12、, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMI
13、TEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 679:2005: EEN 679:2005 (E) 2 Contents page Foreword3 1 Scope 4 2 Normative references 4 3 Principle4 4 Appar
14、atus .4 5 Test specimens4 6 Testing procedure6 7 Test results.7 8 Test report 7 EN 679:2005 (E) 3 Foreword This European Standard (EN 679:2005) has been prepared by Technical Committee CEN/TC 177 “Prefabricated reinforced components of autoclaved aerated concrete or light-weight aggregate concrete w
15、ith 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 January 2006, and conflicting national standards shall be withdrawn at the latest by J
16、anuary 2006. This document supersedes EN 679:1993. In order to meet the performance requirements as laid down in the product standard for prefabricated components of autoclaved aerated concrete, a number of standardized test methods are necessary. According to the CEN/CENELEC Internal Regulations, t
17、he national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Pol
18、and, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 679:2005 (E) 4 1 Scope This European Standard specifies the procedure for the determination of the compressive strength of autoclaved aerated concrete. 2 Normative references The following referenced documents are i
19、ndispensable 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, Determin
20、ation of moisture content of autoclaved aerated concrete EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machines 3 Principle The compressive strength is determined on test specimens as the ratio between the rupture load in axial compression and the cross
21、-sectional area of the test specimen perpendicular to the loading direction. 4 Apparatus a) saw for cutting test specimens; b) compression testing machine, which meets the requirements of EN 12390-4, machine class 1 or 2; c) calipers, capable of reading the dimensions of the test specimens to an acc
22、uracy of 0,1 mm; d) ventilated drying oven, capable of maintaining a temperature of (105 5) C; e) straight edge, at least 200 mm long, a 0,1 mm-feeler gauge, a 1 mm-feeler gauge, and a square; f) balance, capable of determining the mass of the test specimens to an accuracy of 0,1 %. 5 Test specimens
23、 5.1 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. NOTE The test specimens may be prepared from prefabricated reinforced components. Alternatively, they may be taken from prefabricated unreinfo
24、rced components of the same mould. 5.2 Shape and size of test specimens The test specimens shall be cubes with an edge length of 100 mm. Test specimens of other shapes or sizes may be used, provided that the compressive strength determined on such test specimens can be directly related to the compre
25、ssive strength determined on 100 mm cubes. EN 679:2005 (E) 5 5.3 Number of test specimens A test set shall consist of three test specimens. Whenever possible, one test specimen shall be prepared from the upper third of the component, one from the middle and one from the lower third, in the direction
26、 of rise of the mass during manufacture (see Figure 1). The position of the test specimens in the material relative to the rise of the mass shall be shown by the numbering, and the direction of rise shall be marked on the test specimens. Key 1 Direction of rise Figure 1 Sampling scheme 5.4 Preparati
27、on of test specimens The test specimen shall be cut by means of a rotating carborundum blade or similar equipment. They shall not contain any reinforcement. All surfaces shall be plane and clean. The surfaces of the test specimen shall not deviate from planeness by more than 0,1 mm. Planeness shall
28、be checked across the two diagonal using a straight edge and a 0,1 mm-feeler gauge. The angle between the loadbearing surfaces and the adjacent surfaces shall not deviate from a right angle by more than 1 mm/100 mm. This shall be checked along both orthogonal middle axes of the loadbearing surfaces
29、by means of a square and a 1 mm-feeler gauge or similar instrument. 5.5 Measurement of test specimens and determination of their volume The dimension of the test specimen shall be measured to an accuracy of 0,1 mm, using calipers. Length and width of the loadbearing cross-sectional area, AC, shall b
30、e measured in mid height at two opposite sides, and the cross-sectional area shall be calculated by multiplying the mean values of length and width measurements. The height perpendicular to the loadbearing cross-sectional area shall be measured in the middle of two opposite sides adjacent to the loa
31、dbearing surfaces. The volume V of the test specimen shall be calculated by multiplying ACby the mean value of the height measurements. EN 679:2005 (E) 6 5.6 Conditioning of test specimens The test specimen shall be conditioned at a temperature not exceeding 60 C until their moisture content is expe
32、cted to be (6 2) % by mass. This may be estimated by comparing their moist density with the dry density determined in accordance with EN 678 on a companion specimen extracted from the same area of the same component (see NOTE). After reaching the specified moisture content, the test specimen shall b
33、e stored, protected against moisture changes, for at least 2 h for ensuring thermal equilibrium with the laboratory at (20 5) C prior to the compression test. Immediately before the compression test the moist mass, mm, of the test specimen shall be determined again, to an accuracy of 0,1 %. NOTE The
34、 expected moisture content m,exp., in % by mass, of a test specimen can be calculated as 100compcomptm,.expm,= (1) where m,tmm/V is the moist density of the test specimen, calculated by dividing its moist mass mmby its volume V determined according to 5.5, in kilograms per cubic metre; compis the dr
35、y density of the companion specimen determined according to EN 678, in kilograms per cubic metre. 6 Testing procedure 6.1 Compression test The platens of the testing machine shall be wiped clean, and the conditioned test specimen (see 5.6) shall be centred in the testing machine. The load shall be a
36、pplied axially and perpendicularly to the direction of rise. The test specimen shall be loaded gradually and without shock at a constant rate corresponding to a stress increase of (0,1 0,05) MPa per s until rupture of the test specimen occurs. The maximum load carried by the test specimen shall be r
37、ecorded. 6.2 Determination of actual moisture content and dry density of test specimens After the compression test the test specimens shall be dried at (105 5) C until constant mass in order to determine their actual moisture content at the moment of testing in accordance with EN 1353 and their dry
38、density in accordance with EN 678. Care shall be taken that no material is lost. If material is lost, the crushed test specimen should be weighed immediately after the compression test, and its residual volume should be calculated by multiplying its original volume V by the ratio of the moist masses
39、 determined immediately after and before the compression test. EN 679:2005 (E) 7 7 Test results The compressive strength fci, in MPa, of the test specimen i is determined as follows: 321 ,ciici= iAFf (2) where Fiis the maximum load at failure, in Newtons; Aciis the cross-sectional area to which the
40、load is applied, determined in accordance with 5.5, in square millimetres. The compressive strength of each individual test specimen, fci, shall be expressed to the nearest 0,05 MPa. The compressive strength of the product fc, in Megapascals, is defined as the mean value of the compressive strengths
41、 fciof the three test specimens of the test set: 3321/)(ccccffff += (3) The compressive strength of the product, fc, shall be expressed to the nearest 0,1 Megapascal. 8 Test report The test report shall include the following: a) identification of the product; b) date of manufacture or other code; c)
42、 place and date of testing, testing institute and person responsible for testing; d) number and date of issue of this European Standard; e) shape, size, and relative position of the test specimens; f) moisture content of each individual test specimen and mean value; g) dry density of each individual
43、 test specimen and mean value; h) compressive strength of each individual test specimen and compressive strength of the product; i) observations on the appearance of the test specimens. BS EN BSI389 Chiswick High RoadLondonW4 4AL679:2005BSI British Standards InstitutionBSI is the independent nationa
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