BS EN 1170-7-1998 Precast concrete products - Test method for glass-fibre reinforced cement - Measurement of extremes of dimensional variations due to moisture content《预制混凝土制品 玻璃纤维.pdf

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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1170-7 : 1998 The E

2、uropean Standard EN 1170-7 : 1997 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Precast concrete products Test method for glass-fibre reinforced cement Part 7. Measurement of extremes of dimensional variations due to moistur

3、e contentThis British Standard, having been prepared under the direction of the Sector Board for Building and Civil Engineering, was published under the authority of the Standards Board and comes into effect on 15 March 1998 BSI 1998 ISBN 0 580 29200 2 BS EN 1170-7 : 1998 Amendments issued since pub

4、lication Amd. No. Date Text affected National foreword This British Standard is the English language version of EN 1170-7 : 1997. This standard, together with BS EN 1170 Parts 1 to 6, supersedes BS 6432 : 1984 which is withdrawn. The UK participation in its preparation was entrusted to Technical Com

5、mittee B/524, Precast concrete products, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European d

6、evelopments and promulgate them in the UK. The UK voted against this standard at the CEN Formal Vote stage but the analysis of voting, in accordance with CEN/CENELEC Internal Regulations Part 2 : Common rules for standards work resulted in a positive vote. In consequence, the document was accepted a

7、s a European Standard. A list of organizations represented on this committee can be obtained on request to its secretary. 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 s

8、ection entitled International Standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front

9、 cover, the EN title page, pages 2 to 4, an inside back cover and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and

10、by any means reserved worldwide for CEN national Members. Ref. No. EN 1170-7 : 1997 E EUROPEAN STANDARD EN 1170-7 NORME EUROPE ENNE EUROPA ISCHE NORM November 1997 ICS 91.100.30 Descriptors: Concrete products, prefabricated elements, composite materials, cements, glass, verification, conformity test

11、s, measurements, dimensional stability, determination of content, water, weather resistance English version Precast concrete products Test method for glass-fibre reinforced cement Part 7: Measurement of extremes of dimensional variations due to moisture content Produits pre fabrique se nb e ton Me t

12、hode dessai des composites ciment-verre Partie 7: Mesure des variations dimensionnelles extre mes en fonction de la teneur en eau Vorgefertigte Betonerzeugnisse Pru fverfahren fu r Glasfaserbeton Teil 7: Bestimmung der feuchtigkeitsabha ngigen La ngena nderungen This European Standard was approved b

13、y CEN on 29 October 1997. 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. Up-to-date lists and bibliographical references concerning such national stan

14、dards 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 version in any other language made by translation under the responsibility of a CEN member into its own language and notified to

15、 the Central Secretariat has the same status as the official versions. 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 Unit

16、ed Kingdom.Page 2 EN 1170-7 : 1997 BSI 1998 Foreword This European Standard has been prepared by Technical Committee CEN/TC 229, Precast concrete products, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an

17、identical text or by endorsement, at the latest by May 1998, and conflicting national standards shall be withdrawn at the latest by May 1998. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standa

18、rd: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Symbols and abbreviations 3 2.1 Symbols 3 2.2 Abbreviation 3 3

19、Apparatus 3 4 Procedure 3 4.1 Test pieces 3 4.2 Test method 4 5 Expression of results 4 5.1 Shrinkage value 4 5.2 Expansion value 4 5.3 Value of extreme dimensional variations 4 6 Interpreting the test 4 7 Test report 4Page 3 EN 1170-7 : 1997 BSI 1998 1 Scope This European Standard specifies a test

20、method for identifying the maximum dimensional variations (residual hydraulic shrinkage and reversible expansion) of a GRC composition attributable to variations in the water content to which products exposed to the elements may be subjected. 2 Symbols and abbreviations 2.1 Symbols l 0 distance betw

21、een pads measured at the beginning of the test, in micrometres; l 1 distance between pads measured after 96 h immersion, in micrometres; l 2 distance between pads measured after 21 days drying in the oven and 6 h stabilization, in micrometres; m 0 mass of test piece at the beginning of the test, in

22、grams; m 1 mass of test piece after 96 h immersion, in grams; m 2 mass of test piece after 21 days oven drying and 6 h stabilization, in grams; Dl c l value of extreme dimensional variation, in millimetres per metre; Dl e l value of expansion, in millimetres per metre. This is the arithmetic mean of

23、 the expansion values of the three test pieces tested; Dl s l value of residual shrinkage, in millimetres per metre. This is the arithmetic mean of the shrinkage values of the three test pieces tested. 2.2 Abbreviation GRC Glass-fibre reinforced cement. 3 Apparatus The apparatus comprises: a scale,

24、with a measuring range 0 kg to 2 kg, accurate to 0,1 g; a ventilated drying oven, maintained at a temperature of (33 3)8C; a test board, made of smooth, easily cleaned material, approximately (5003 800) mm. With premix production, provide a frame of thickness equal to that of the product manufacture

25、d; a rule, accurate to 0,5 mm; a flat bottomed tank, approximately (5003 2003 100) mm filled with water maintained at (20 2)8C; an extensometer, with a minimum gauge length of 200 mm, accurate to 0,002 mm; stainless steel measuring pads, with a minimum surface area of 25 mm 2 ; epoxy resin, suitable

26、 for fixing the gauge pads. 4 Procedure 4.1 Test pieces On the flat board, make a sample panel with its facing layer under the same conditions as for the actual production it represents: premix or spray. After 24 h, demould and store the sample panel in the same conditions as for the actual producti

27、on which it represents until it is 6 days old. Cut by sawing, ( ) mm from the edges of the panel, 50 0 +1 six test pieces from the positions illustrated in figure 1. NOTE. The test pieces may also be cut out on the day of demoulding. Dimensions of the test pieces: width: (50 2) mm; length: (400 2) m

28、m. Mark the test pieces as shown in figure 1. Figure 1. Positions for cutting out test pieces Store the test pieces in the laboratory at a temperature of (20 3)8C and relative humidity of (60 5) % until the products have reached the test age defined by agreement between the producer and the customer

29、. If no information is provided, the test age adopted is conventionally 10 days after manufacture. The test pieces shall be placed individually into leaktight bags for transportation from the production site to the test laboratory. The transportation time shall not be taken into account when calcula

30、ting the age.Page 4 EN 1170-7 : 1997 BSI 1998 4.2 Test method Bond two location pads, using an epoxy resin suitable for gauge fixing, to the two faces of each test piece. Mark each face, i.e. U for the top face and D for the bottom face. Weigh each test piece, i.e. m 0 (in grams). Measure the distan

31、ce, expressed inmm, between the pads on each test piece face, i.e.: l 0,U for the U face; l 0,D for the D face. 4.2.1 Measurement of residual shrinkage by drying Place the three test pieces T 1 ,T 3 ,B 1 in the ventilated oven adjusted to (33 3)8C. Place the test pieces on an edge so that the hot ai

32、r circulates correctly over the two measuring faces. After 21 days, remove the test pieces from the oven and place them in the laboratory at a temperature of (20 3)8C. After stabilizing for 6 h: weigh each test piece, i.e. m 2 (in grams); measure the distance between pads on each face, expressed inm

33、m, i.e.: l 2,U for the U face; l 2,D for the D face. 4.2.2 Measurement of reversible expansion by immersion Place the three test pieces T 2 ,B 2 and B 3 in the tank filled with water at a temperature of (20 2)8C. Place the test pieces on an edge and ensure that the test pieces are completely immerse

34、d. After 96 h of immersion in the water at (20 2)8C, remove the test pieces, wipe with a damp cloth, and: weigh each test piece, i.e. m 1 (in grams); measure the distance between the pads on each face, expressed inmm, i.e.: l 1,U for the U face; l 1,D for the D face. 5 Expression of results 5.1 Shri

35、nkage value The residual shrinkage value of each test piece , Dl s l expressed in mm/m, is the arithmetic mean of the value obtained for each face (face U and face D), each calculated from the equation: = 3 10 3 Dl s l l 0 2 l 2 l 0 The shrinkage value of a GRC composition is characterized by the ar

36、ithmetic mean of the shrinkage values of the three test pieces. 5.2 Expansion value The expansion value of each test piece expressed , Dl e l in mm/m, is equal to the arithmetic mean of the two values (face U and face D), each being calculated from the equation: = 3 10 3 Dl e l l 1 2 l 0 l 0 The exp

37、ansion value of a GRC composition is characterized by the arithmetic mean of the expansion values of the three test pieces. 5.3 Value of extreme dimensional variations The value of the extreme dimensional variation as a function of the water content of a GRC composition is given by the equation: =+

38、D l c l D l s l D l e l NOTE. The results are supplemented by the and Dl s l Dl e l expression of variations of the mean mass observed, in percentage, i.e: 3 100 for the shrinkage; m 0 2 m 2 m 0 3 100 for the extension. m 1 2 m 0 m 0 6 Interpreting the test is the expression of residual hydraulic sh

39、rinkage. Dl s l The result is a function of three parameters: the GRC composition, the hygrometric conditions beforehand and the age of products when tested. is the expression of reversible expansion. The Dl e l result is a function of two parameters: the GRC composition and the age of products when

40、 tested. It is evident that the results and cannot be Dl s l Dl e l taken separately and that the result is the Dl c l expression of the maximum conventional value. 7 Test report The test report shall give the following information: the identification of the laboratory (notably measuring accuracy, c

41、haracteristics of the extensometer, the name of the test supervisor); the complete identification of the test pieces (especially the origin, the GRC composition, the curing, storage and transportation conditions, date of manufacture of the panels, marking of test pieces); the dates of beginning and

42、end of tests; all the individual results; the mean values and , Dl s l Dl e l ; Dl c l the reference to this standard.blankBSI 389 Chiswick High Road London W4 4AL | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |

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