1、July 2009DEUTSCHE NORM English price group 8No 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 91.100.30!$XEn“1533475www.
2、din.deDDIN EN 12390-7Testing hardened concrete Part 7: Density of hardened concreteEnglish version of DIN EN 12390-7:2009-07Prfung von Festbeton Teil 7: Dichte von FestbetonEnglische Fassung DIN EN 12390-7:2009-07SupersedesDIN EN 12390-7:2001-02 andDIN EN 12390-7 Corrigendum1:2006-05www.beuth.deDocu
3、ment comprises pages12DIN EN 12390-7:2009-07 National foreword This standard has been prepared by Technical Committee CEN/TC 104 “Concrete and related products” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the Normenausschuss Bauwesen (Building and Civil E
4、ngineering Standards Committee), Technical Committee NA 005-07-05 AA Prfverfahren fr Beton. Amendments This standard differs from DIN EN 12390-7:2001-02 and DIN EN 12390-7 Corrigendum 1:2006-05 as follows: a) The standard has been editorially revised. Previous editions DIN EN 12390-7: 2001-02 DIN EN
5、 12390-7 Corrigendum 1: 2006-05 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12390-7 February 2009 ICS 91.100.30 Supersedes EN 12390-7:2000 English Version Testing hardened concrete Part 7: Density of hardened concrete Essai pour bton durci Partie 7: Masse volumique du bton durci Prfung vo
6、n Festbeton Teil 7: Dichte von Festbeton This European Standard was approved by CEN on 27 December 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 alteration
7、. 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 by translati
8、onunder 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,Germany, Gre
9、ece, 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 NORMUNG Managem
10、ent Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12390-7:2009: EEN 12390-7:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Apparatus .4 4 Test specimens 4 5
11、 Procedures .5 6 Test result .8 7 Test report 8 8 Precision .8 Bibliography . 10 DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 3 Foreword This document (EN 12390-7:2009) has been prepared by Technical Committee CEN/TC 104 “Concrete and related products”, the secretariat of which is held by DIN. This Eu
12、ropean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2009, and conflicting national standards shall be withdrawn at the latest by August 2009. Attention is drawn to the possibility that some of the ele
13、ments 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 12390-7:2000. This standard is one of a series concerned with testing concrete. The series EN 12390 includes the fol
14、lowing parts: EN 12390 Testing hardened concrete Part 1: Shape, dimensions and other requirements for specimens and moulds; Part 2: Making and curing specimens for strength tests; Part 3: Compressive strength of test specimens; Part 4: Compressive strength - Specification for testing machines; Part
15、5: Flexural strength of test specimens; Part 6: Tensile splitting strength of test specimens; Part 7: Density of hardened concrete; Part 8: Depth of penetration of water under pressure. The following amendments have been made to the 2000-10 edition of this standard: editorial revision According to t
16、he 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, Lithua
17、nia, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 4 1 Scope This European Standard specifies a method for determining the density of hardened concrete. It is applic
18、able to lightweight, normal-weight and heavy-weight concrete. It differentiates between hardened concrete in the following states: 1) as-received; 2) water saturated; 3) oven-dried. The mass and volume of the specimen of hardened concrete are determined and the density calculated. 2 Normative refere
19、nces 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 12390-1, Testing hardened concrete Part 1
20、: Shape, dimensions and other requirements for test specimens and moulds 3 Apparatus 3.1 Callipers and rules, capable of determining the dimensions of a specimen to within 0,5 % 3.2 Balance, equipped with a stirrup for weighing the specimen in both air and water to an accuracy of 0,1 % of the mass 3
21、.3 Water tank, fitted with a device to maintain the water at a constant level and of sufficient size to allow the specimen on the stirrup to be fully immersed to a constant depth NOTE If the reading of the balance is affected to within the accuracy required due to the displacement of water when imme
22、rsing the specimen, then the tank should be fitted with a device to maintain the water at a constant level. The tank should be of sufficient size to allow the specimen to be fully immersed. 3.4 Ventilated oven, in which the temperature is capable of being controlled at (105 5) C. NOTE The apparatus
23、required depends upon the method selected for determining the volume of the specimen. 4 Test specimens The minimum volume of a specimen shall be 0,785 l. If the nominal maximum aggregate size of specimens cast in moulds exceeds 25 mm, the minimum volume shall be not less than 50D, where D is the nom
24、inal maximum size of the coarse aggregate. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 5 Normally, the entire specimen as received shall be used for the determination. If the shape or size of a specimen is such that it is not possible to use all of it, a smaller specimen may be broken or sawn from th
25、e original. Capped specimens shall not be used. 5 Procedures 5.1 General 5.1.1 Determination of mass This European Standard recognizes three conditions under which the mass of a specimen can be determined: a) as-received; b) water saturated; c) oven-dried. 5.1.2 Determination of volume This European
26、 Standard recognizes three methods for determining the volume of the specimen: a) by water displacement (reference method); b) by calculation using actual measurements; c) for cubes, by calculation, using checked, designated dimensions. NOTE 1 The precision of the method depends on the method select
27、ed for measuring the volume of the specimen. Measurement of volume by the water-displacement method is the most precise, followed by calculation using measurement of actual dimensions and lastly calculation using checked, designated dimensions. NOTE 2 The limitation to cubes in 5.1.2 c) of using des
28、ignated dimensions in calculation of volume is due to the greater tolerance on length, according to EN 12390-1, of other specimen shapes. 5.2 Mass of as-received specimen Weigh the as-received specimen mr, to an accuracy of 0,01 % of the mass of the specimen. Record the value indicated in kg. 5.3 Ma
29、ss of water saturated specimen Immerse the specimen in water at (20 2) C until the mass changes by less than 0,2 % in 24 h, wiping the surplus water from the surface before each weighing. Record the value of the saturated mass ms, in kg. NOTE Specimens of concrete cured in water for at least 72 h pr
30、ior to testing, may be assumed to be saturated to a constant mass. 5.4 Mass of oven-dried specimen Dry the specimen in a ventilated oven at (105 5) C until the mass changes by less than 0,2 % in 24 h. Before each weighing, cool the specimen to near room temperature in a dry airtight vessel or desicc
31、ator. Record the value of the oven-dried mass moas indicated, in kg. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 6 5.5 Volume obtained by water displacement 5.5.1 General Ensure that the specimen is in a saturated condition. NOTE 1 This method is suitable for specimens of all shapes and is the only m
32、ethod suitable for specimens of irregular shape. NOTE 2 This method is normally unsuitable for specimens of no-fines concrete, lightweight aggregate concrete with large pores, or specimens whose moisture content must not be altered. However, the application of a thin water impermeable layer can make
33、 this method practicable. 5.5.2 Mass in water Determine the mass of the specimen in water according to the following procedure: Raise the water tank until the stirrup, without a specimen, is immersed in the water tank and does not touch the bottom of the tank. Record the apparent mass of the stirrup
34、 mst, in kg. NOTE 1 The apparent mass of the stirrup may alternatively be allowed for using a zero setting facility on the balance (tareing). Place the specimen in the stirrup and raise the water tank until the specimen is submerged and the water level on the stirrup is the same as it was without th
35、e specimen. NOTE 2 Trapping of air bubbles on the sides of the specimen and on the stirrup should be avoided. Record the apparent mass (mst+ mw), in kg, of the immersed specimen and stirrup. 5.5.3 Mass in air Determine the mass of the specimen in air according to the following procedure: Remove the
36、specimen from the stirrup and wipe the surplus water from the surfaces, using a damp cloth. Place the specimen on the balance and record the mass of the specimen in air main kg. 5.5.4 Calculate the volume of the specimen Calculate the volume of the specimen, using the formula: astwstw( ) mmmmV+=(1)
37、where: V is the volume of the specimen, in m; mais the mass of the specimen in air, in kg; mstis the apparent mass of the immersed stirrup, in kg; mwis the apparent mass of the immersed specimen, in kg; wis the density of water, at 20C, taken as 998 kg/m. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 7
38、 a) Stirrup suspended beneath balance mechanism b) Alternative form of stirrup suspended beneath balance machanism Key 1 Balance 2 Stirrup 3 Concrete specimen 4 Guide 5 Water tank is moved vertically 6 Side view of stirrup Figure 1 Typical stirrup arrangement for the determination of the volume of c
39、oncrete specimens by water displacement 5.5.5 Volume obtained by measurement Calculate the volume of the specimen from measurements made on the specimen in accordance with EN 12390-1, in m, rounded to four significant figures. 5.5.6 Volume obtained by using designated dimensions (cubes only) Confirm
40、 that the cube has been made in a calibrated mould, conforming to EN 12390-1. Check the dimensions in accordance with EN 12390-1. Calculate the volume of the cube in m, expressed to 3 significant figures. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 8 6 Test result Calculate the density using the valu
41、es determined for the mass of specimen and its volume, using the formula: VmD = (2) where: D is the density related to the condition of the specimen and the method of determining the volume, in kg/m; m is the mass of the specimen as determined in 5.2, 5.3 or 5.4 at the time of test, in kg; V is the
42、volume determined by the particular method, in m. Report the condition of the specimen at the time of test and the method used for determining the volume of the specimen as part of the test result. Express the result of the density determination to the nearest 10 kg/m. 7 Test report The report shall
43、 include: a) identification of the test specimen; b) location of performance of test; c) description of the specimen (e.g. 100 mm cube, 150 mm diameter core); d) details of specimen preparation (if any); e) condition of specimen at time of test; (as-received, or water saturated, or oven-dried); f) m
44、ethod of determination of volume; (water displacement, or measured size, or checked, designated size); g) date of test; h) calculated density of specimen, in kg/m; i) any deviation from the standard test method; j) a declaration by the person technically responsible for the test that it was carried
45、out in accordance with this document, except as noted in item i). 8 Precision Precision data are given in Table 1. These apply to density measurements in the range 2 300 kg/m3to 2 400 kg/m3on cubes made from the same sample of concrete and when each test result is obtained from a single determinatio
46、n of the saturated density of a single cube. They indicate the variability that occurs when sampling, making and curing the cubes. DIN EN 12390-7:2009-07 EN 12390-7:2009 (E) 9 Table 1 Precision data for measurements of the saturated density of hardened concrete Test method Repeatability conditions R
47、eproducibility conditions Srkg/m3r kg/m3SRkg/m3R kg/m3By calculation using measured dimensions: 100 mm cubes, 150 mm cubes. 13,9 9,9 39 28 20,5 20,5 57 57 By water displacement: 100 mm cubes 150 mm cubes 6,5 6,4 18 18 12,8 10,6 36 30 NOTE 1 The precision data were determined as part of an experiment
48、 carried out in 1987 in which precision data were obtained for several of the tests described in BS 1881. The experiment involved 16 operators. The concretes were made using an ordinary Portland cement, Thames Valley sand, and Thames Valley 10 mm and 20 mm coarse aggregates. NOTE 2 The difference be
49、tween two test results from the same sample by one operator using the same apparatus within the shortest feasible time interval will exceed the repeatability value r on average not more than once in 20 cases in the normal and correct operation of the method. NOTE 3 Test results on the same sample obtained within the shortest feasible time interval by two operators each using their own apparatus will differ by the reproducibility value R on average not more than once in 20 cases in the normal and correct operation of the method. NOT
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