1、BRITISH STANDARD Methods of test for masonry units Part 14: Determination of moisture movement of aggregate concrete and manufactured stone masonry units The European Standard EN 772-14:2001 has the status of a British Standard ICs 91.100.30 BS EN 772- 14 12002 Wk present to the responsible European
2、 committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - - A list oforganizations represented on this subcommittee can be obtained on request to its secretary.
3、 Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Elec
4、tronic Catalogue. ABritish Standard does not purport toinclude all the necessary provisions ofa contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This docu
5、ment comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 31 January 2002 ISBN O 580 38985 5 EUROPEAN STANDARD NORME EUROPENNE EURO
6、PISCHE NORM EN 772-14 November 2001 ICs 91.100.30 English version Methods of test for masonry units - Part 14: Determination of moisture movement of aggregate concrete and manufactured stone masonry units Mthode dessai pour des lments de maonnerie - Partie: 14 dtermination de la variation due lhumid
7、it des lments de maonnerie en bton de granulats et en pierre reconstitue Prfverfahren fr Mauersteine - Teil 14: Bestimmung der feuchtebedingten Formnderung von Mauersteinen aus Beton und Betonwerksteinen This European Standard was approved by CEN on 13 October 2001 CEN members are bound to comply wi
8、th the CENKENELEC 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 Management Centre
9、 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 Management Centre has the same status as the official vers
10、ions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KO
11、MITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stassart, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 772-14:2001 E EN 772-14:2001 (E) Contents Foreword 1 Scope 2 Normative re
12、ferences 3 Principle 4 Symbols 5 Apparatus 6 Preparation of specimens 7 Procedure 8 Expression of results 9 Evaluation of results 10 Test report page 3 4 4 4 4 5 5 7 9 9 10 2 EN 772-14:2001 (E) Foreword This European Standard has been prepared by Technical Committee CEN/TC 125 “Masonry“, the secreta
13、riat of which is held by BSI. 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 May 2002, and conflicting national standards shall be withdrawn at the latest by March 2004. According to the CENKENEL
14、EC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swit
15、zerland and the United Kingdom. 3 EN 772-14:2001 (E) 1 Scope This European Standard specifies a method of measuring the moisture movement of aggregate concrete and manufactured stone masonry units between two specified extreme moisture conditions. 2 Normative references This European Standard incorp
16、orates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Euro
17、pean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). prEN 771-3, Specijcation for masonry units - Part 3: Aggregate concrete masonry units (dense and lightweight aggregates). prEN
18、 771-5, Specijcation for masonry units - Part 5: Manufactured stone masonry units. 3 Principle This test measures, on masonry units of the same concrete compositions and the same sampling: a) the expansion between the initial condition and after soaking in water for 4 days; b) the shrinkage between
19、the initial condition and after drying for 21 days in a ventilated oven at 33 OC. 4 Symbols lo i lLi lZi Al, /I Al, /I Al, /I is the initial distance between gauge location pads, (mm) is the distance between gauge location pads after soaking, (mm) is the distance between gauge location pads after dr
20、ying, (mm) is the mean moisture expansion coefficient, (dm) is the mean drying shrinkage coefficient, (dm) is the total movement coefficient, (dm) 4 EN 772-14:2001 (E) Algl/l is the individual moisture expansion coefficient, (dm) Alri /I is the individual drying shrinkage coefficient, (dm) mo,s is t
21、he mass of specimen before drying, (g) md,s is the mass of specimen after drying, (g) ws is the moisture content, (“A) by mass 5 Apparatus 5.1 Gauge location pads. 5.2 Adhesive appropriate for use under the conditions given in 5.4 and 5.5. 5.3 Measuring device suitable for measuring changes in lengt
22、h with an accuracy of at least 0,002 mm. 5.4 Ventilated oven with a volume of at least 9 times the volume of the specimens to be dried at one time, capable of being maintained at a temperature of 33 “C f 3C. The oven is ventilated top and bottom for free convection or by a forced system that ensures
23、 at least 3 air changes per hour. 5.5 Tank of water, maintained at a temperature of 20 “C f 2 “C and of sufficient volume to hold all the specimens to be soaked at one time and to ensure free access of the water to all faces. 5.6 Weighing instrument capable of weighing the specimens with an accuracy
24、 of O, 1 %. 5.7 Calibration rods of Invar steel. 2 5.8 Four support pads per specimen of 1 cm maximum cross-section and with a minimum height of 10 mm. 6 Preparation of specimens 6.1 Sampling The test specimens shall consist of whole masonry units or be cut from whole masonry units. In every case th
25、e samples shall be sealed in airtight bags immediately after sampling until they are prepared for test. The dates of manufacturing and sampling shall be declared. The age of the specimens at the beginning of the test shall be 28 days unless otherwise is specified. 5 EN 772-14:2001 (E) Length of spec
26、imen 100 to 200 201 to 300 over 300 The method of sampling shall be stated in the test report. The minimum number of specimens shall be six, but a larger minimum number may be specified in the product specification, in which case that larger number shall be used. Minimum gauge length 80 180 280 6.2
27、Conditioning Unless otherwise is specified, remove the specimens from the airtight bags after 14 days and store them for a further 14 days in the laboratory under the following conditions: Temp erature 2 15 “C Relative humidity 5 65 % In the laboratory store the specimens so that each one is similar
28、ly exposed. At the end of the 14 day laboratory storage weigh every specimen and number them 1 to 6 from the lightest to the heaviest (m, ). The test shall be deemed to have begun at the end of the 14 day laboratory conditioning period following the 14 days in airtight bags. 6.3 Preparation for meas
29、urements Fix two gauge location pads (5.1) using appropriate adhesive glue (5.2) to each of the specimens at an appropriate gauge length apart (see Table 1) in an appropriate position (see Figure 1) and mark one of the pads on each specimen with a distinctive sign. A suitable template should be used
30、 to space the pads. Table 1 - Gauge length for specimens 6 EN 772-14:2001 (E) I I I I I I a) Fix on bed face b) Fix on the external shell Figure 1 - Positioning of gauge location pads a) For specimens which are whole units without voids passing right through, fix the gauge location pads on the bed f
31、ace. b) For specimens which are whole masonry units with voids passing right through, fix the gauge location pads on the shell. c) For specimens which are parts of masonry units fix the gauge location pads on a surface which would be a bed face, see a) above. 7 Procedure 7.1 General Carry out the te
32、st in laboratory maintained at a temperature of 20 “C f 2 “C and a relative humidity of 50 % to 65 %. Before taking any measurements calibrate the measuring device using the Invar calibration rods (5.7). 7.2 Initial measurement Keep the specimen in the laboratory for 6 h before taking the first meas
33、urements. Measure the initial distance loi between the pads on the 6 specimens, taking care to place the mobile end of the gauge on the marked pad. Record the results in mm at least to the nearest 0,002 mm. 7 EN 772-14:2001 (E) 7.3 Measurement of moisture expansion Place the specimens Nos. 2,4 and 6
34、 in the water tank (5.5) at 20 “C f 2 “C with the location pads uppermost. Use the support pads (5.8) to keep the specimens at least 10 mm from the bottom of the tank and ensure at least 50 mm of water over the top of them (see Figure 2). Dimensions in millimetres .) Figure 2 - Positioning of specim
35、ens in water tank After 96 h in water remove the specimens from the water tank, allow them to drain for 1 O min and then measure the distance lIi between the pads on the 3 specimens, placing the mobile end of the gauge on the marked pad. Record the results in mm at least to the nearest 0,002 mm. 7.4
36、 Measurement of drying shrinkage Place specimens Nos. 1, 3 and 5 in the ventilated oven (5.4) at 33 “C f 3 “C oriented as they are expected to be used. Ensure that the hot air has free access to all faces. After 2 1 days, remove the specimens from the oven and allow to stabilize in the laboratory fo
37、r 6 h. Measure the distance 12i between the pads on the three specimens, placing the mobile end of the gauge on the marked pad. Record the results in mm at least to the nearest 0,002 mm. Weigh each specimen (WZ,.,). 8 EN 772-14:2001 (E) 8 Expression of results 8.1 Moisture expansion Calculate the mo
38、isture expansion coefficient of each of the specimens using the formula: Al, lli -loi - x 1000 mm/m - 8.2 Drying shrinkage Calculate the drying shrinkage coefficient of each of the specimens using the formula: Alri loi -Z,i - x 1000 mm/m - 1 loi Calculate the moisture content (w, )of the specimens 1
39、, 3 and 5 from the ratio of the loss in mass during drying to the dry mass expressed to the nearest 0,5%. x 100% mo,s - mdry,s mdW ws = 9 Evaluation of results Al, Calculate the arithmetic mean of the moisture expansion coefficients for the three specimens - to two decimal places. 1 Al, Calculate th
40、e arithmetic mean of the drying shrinkage coefficients for the three specimens - to two decimal places. Calculate the total movement coefficient of the sample 1 and record it to 0,Ol mm/m 9 EN 772-14:2001 (E) Calculate the mean value of the moisture content of the specimens 1, 3 and 5 (wJ to the nea
41、rest 1% and report as the moisture content of the sample. 10 Test report The test report shall contain the following information: a) the number, title and date of issue of this European Standard; b) description of the masonry unit to the relevant standard prEN 77 1-3 or prEN 77 1-5; c) the method of
42、 sampling and by which organization; d) the date of production and the date of sampling of the specimens; e) the date of preparation of the specimens, the dates of commencement) and completion of the tests for moisture expansion and drying shrinkage; f) the storage conditions between delivery and te
43、st; g) the weight of each sample at the time of initial measurement, expressed in kg to O, 1 kg; h) the individual drying shrinkage and moisture expansion coefficients in mm/m to 0,Ol mm/m; i) the mean shrinkage and expansion coefficients expressed in mm/m to 0,O 1 mm/m; j) the total movement coeffi
44、cient of the sample expressed in mm/m to 0,O 1 mm/m; k) the individual values of moisture content of the specimens 1, 3 and 5 to the nearest 0,5% and mean value of moisture content to the nearest 1 %; 1) remarks, if any. The date of commencement of the test is defined in 6.1. The test will have two
45、different end points, one for the specimens which have been subjected to soaking and another for the specimens subjected to drying. 1 10 BS EN 772-1412002 BSI 389 Chiswick High Road Lon don w4 4AL BSI is the independent national body responsible for preparing British Standards. It presents the UK vi
46、ew on standards in Europe and at the international level. It is incorporated by Royal Charter. Re vi si ons British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improv
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