1、BRITISH STANDARD _ Products and systems for the protection and repair of concrete structures - Test methods - Determination of the coefficient of thermal expansion BS EN 1770:1998 The European Standard EN 1770 1998 has the status of a British Standard ICs 91.080.40 NO COPYING WITHOUT BSI PERMISSION
2、EXCEPT AS PERMITTED BY COPYRIGHT LAW STD-BSI BS EN 1770-ENGL 198 W 1b24bb7 0744187 TO7 Date BS EN 17701998 Textaffected National foreword This British Standard is the English ianguage version of EN 17701998. The LJK participation in its preparation was entrusted by Technid Committee M17, Concrete, t
3、o Subcommittee B/517/8, Protection and repair of concrete stru-, which has the responsibility to: - aid enquirem to understand the text; - present to the responsible European committee any enquiries on the - monitor related intedonal and European developments and promulgate interpretation, or propos
4、ais for change, and keep the UK interests informed; theminthem A list of organizations represented on this committee can be obtained on request to its secrehy. Cross-references The British Standards which implement internationaJ or European pubiications referred to in this document may be found in t
5、he BSI Standards Catalogue under the section entitled “int,emaionai Standards Correspondence index“, or by using the “Find“ facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include aii the necessary provisions of a contract Usem of British Standards are resp
6、onsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a hnt cover, an inside hnt cover, the EN title page, pages 2 to 10, an inside back cover and a back cover. This British Standa
7、rd, having Amendments issued since publication been prepared under the Chunittee for Building and Cid Engineering, was published under the authoriy of the Standards committee and comes into effect on 15 November 1998 direction of the sector Amd No. Q BSI 199 ISBN O 580 80117 6 - STD-BSI BS EN L77U-E
8、NGL 1978 m Lb24bb 0744390 729 W EUROPEAN SrANDm EN 1770 NORME EUR0PEE”E EUROP b) transducer, for sensing movement of the probe resulting from changes in length of the specimen and for translating these movements into an electrical signal suitable for input to a recording system; c) temperature sensi
9、ng element, for measuring the temperature of the test specimen; Page 3 EN 177 is the mean coefficient of linear thermai expansion, for reference materiai, is the calibration coefficient; is the specimen length at room temperature, in meires (m); is the change of reference material length due to heat
10、ing, in micrometres (pm); is the reference material length at room temperature, in metres (m); is the change of specimen length, in micrometres (pm); in pn/(m“C); AT,f is the temperature Merence over which the change in reference material length is measured, in OC; is the temperature Merence over wh
11、ich the change in specimen length is measured, in OC. AT 3.4.2 Select AT from a smooth portion of the thermai curves in the desired temperature range; then obtain AL as depicted in Fgure 1. The am shal not be caicdated from a temperature range in which a transition point is noted. 3.4.3 Calculate th
12、e average value of am from the tests on three specimens. 3.6 Test report The following information shall be included in the test repk a) identication of the material, including the name of the manufacturer and infomation on batch number and chemical composition when known; b) method of test specimen
13、 preparation; c) dimensions of test specimen; d) description of the thennomechanical analysis apparatus; e) purge gas and cooling medium, if used; f) temperature range in which the coefficient of hear thermal expansion has been determined, g) average value of the coefficient of hear thermai expansio
14、n in p.n(m.“C) as determined from the three specimens; h) expansion curves obtained, i) reference to this European standard. 4 Alternative method 4.1 Principle The coefficient of thermal expansion of resinous materials shall be measured after bei stored for 7 days (storage at (21 f 2) “C and (60 f 1
15、0) % relative humidity). Once hardened the bonding agent is subjected to a number of temperature cycles while movements of the ends and changes in temperahre of the mortar are monitored. The measurement is done with a dial gauge via two pegs, fixed to the end of the longer axis of the specimen. in t
16、he test equipment the sample shaii be free to move in this axis. The method may also be used to determine the coefficient of thermal expansion of repair mortars. 0 BSI 1998 STD-BSI BS EN 1770-ENGL L718 E lb24bb7 074414Li 374 = Page 6 EN 17701998 4.2 Apparatus 4.3 Test procedure 4.3.1 Sampling materi
17、al The bonding agent to be tested shall be taken from a) Mould Steel mould containing three impressions of (See Figure 2). b) %per The tamper is shown in Figure 3. It shall have a sheet protection, of iight metal or of light plastic. c) Measuring pegs Measuring pegs shall be designed so that they ca
18、n (40 f 0,1 mm (40 f 01) mm (l6O -* one production batch NOTE Specimens made for compressive strength testing can be used for determining the coefficient of thermal expansion. a) Samples made of fresh mortars as described in prEN 12190. If highly reactive materiais are used (exothermic reaction), th
19、e moulds shall be cooled mass Of (500 20) g. It shall be made Of wood with The prepdon of the -ples shall be b) temperature and duration of preconditioning of the constituents; c) date and location of mortar specimen preparation and test; d) the cure and storage history of the specimen prior totest;
20、 e) description of test equipment used; f) the effectjive length of the specimen, to the nearest millimetre; g) tabulation of the results obtained, giving for each temperature the change in length of the prism (with an accuracy of 401 m); h) the coefficient of thennai expansion cl, in the range hm -
21、20 OC to 40 OC, rounded to 0,5 x lo+/ OC; i) the amount of any postcure j) mean value of the permanent expansion to 0,Ol mm/m; k) reference to this European Standard 6 Reproducibility “he test method based upon thennomechanical analysis wiii provide a reproducibility of fl OC. The aiternative test m
22、ethod wiii provide a reproducibjiity of I6 OC for detennhtions above 23 OC and more than OC for determinations below 23 OC. The inferior reproducibiiity of the aiternative test method arises due to tempemlure changes which occur whilst the specimen is removed from environmental chamber for length me
23、asurements to be taken. with the notation given in 3.4.1. A further correction may be made to take into account the cdcient of thennai expansion of the measuring Pe* 8 BSI 1998 STD*BSI BS EN L770-ENGL 2978 U lbZLibb7 074LI19b 147 = Page 7 EN 17701998 I Figure 1 - Specimen expansion versus temperatur
24、e Dimensions in millimetres I -.- (1) Covering strip (4) With top frame (2) Top frame, inside width (39,6 f 0,Z) mm (5) Without top frame (3) Covering strip Figure 2 - Three section mould for specimen preparation O BSI 1998 STD-BSI BS EN 1770-ENGL 1198 m LL24bb9 074197 O83 Page 8 EN 177i on. Tel: 01
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26、system or tramm&d in any form or by any means - electronic, photocopying, recording or otherwise - without prior wtitten permission from BSL This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbok, and size, type or grade desigmons If these details are to be used for any other putpose than implementation then the prior wriaen permission of BSI must be obtained. If permission is granted, the terms may include rom payments or a licensing agreement Detaiis and advice can be obtained from the Copyright Manager. Tel: 0181 996 7070.
