JIS-A-6904-1997-ENG.pdf
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1、J IS JAPANESE INDUSTRIAL STANDARD Translated and Published by Japanese Standards Association Gypsum plasters ICs 91.100.10 Descriptors : gypsum plaster, plastering Reference number : JIS A 6904 : 1997 (E) 10 s Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IH
2、S Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:15:50 MDTNo reproduction or networking permitted without license from IHS -,-,- A 6904 : 1997 This translation has been made based on the original Japanese Industrial Standard revised by the Minister of International Trade and I
3、ndustry through deliberations at Japanese Industrial Standards Committee in accordance with the Industrial Standardization Law: Date of Establishment: 1952-09-04 Date of Revision: 1997-08-20 Date of Public Notice in Official Gazette: 1997-08-20 Investigated by: Japanese Industrial Standards Committe
4、e Divisional Council on Architecture JIS A 6904 : 1997, First English edition published i n 1998-04 Translated and published by: Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final
5、 authority. O JSA 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. Printed in Japan Copyright
6、Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:15:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS A b7OLi-ENGL 1777 m 4733b08 0547845 707 W JAPANESE INDUSTRIA
7、L STANDARD JIS A 6904 : 1997 Gypsum plasters Introduction This Japanese Industrial Standard has been prepared on the basis of the corresponding parts (standard test condition, test on fineness of grinding and determination of bulk density) of the following International Standards without changing th
8、e technical content but adding the provisions mentioned below which are not included in the corresponding International Standards, as the provisions of the Japanese Industrial Standard. Number, year of publication and title of the International Standards IS0 3048 : 1974 Gypsum plasters- General test
9、 conditions IS0 3049 : 1974 Gypsum plasters - Determination of physical properties of powder IS0 3052 : 1974 Gypsum plasters- Determination of wafer of crystallization content Provisions added as Japanese Industrial Standard Definitions, classification, quality, bending strength test, c.ompressive s
10、trength test, hardness test, inspection, marking, clicined gypsum content and setting time. 1 Scope This Japanese Industrial Standard specifies the gypsum plasters used for plaster work of buildings in building site or manufacturing factory by proportioning with aggregate and mixing with water. Rema
11、rks 1 The normative references to this Standard are as follows : JIS R 5201 JIS R 9101 JIS Z 8801 Testsieves The units and numerical values given in the traditional units and appended for reference. Physical testing methods for cement Methods for chemical analysis of gypsum 2 in this Standard are ba
12、sed on 2 Definitions For the purpose of this Standard, the following definitions apply : gypsum plaster and mixed, when necessary, with admixtures, thickeners, setting retarders, etc. plaster proportioned at work site mixing with water in building site. preproportioned plaster advance and usable onl
13、y by mixing with water in building site. first coating applies. finish coating ciicined gypsum hydrate gypsum, and symbolized as CaS04*1/2 ib0. Powdery wall coating material consisting mainly of clicined gypsum Plaster used by proportioning with aggregate and Plaster in which aggregate, admixture, e
14、tc. are mixed in Process of coating wall for making bedding on which finish coating Process of coating base or bedding thinly as finishing as it is. Material obtained by baking gypsum and consisting mainly of semi- Informative reference : For the aggregate of preproportioned plaster, river sand, qua
15、rtz sand, crushed sand, vermiculite, pearlite, calcium carbonate, etc. are used. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:15:50 MDTNo reproduction or networking permitted without
16、license from IHS -,-,- STD-JIS A bSOLi-ENGL Class 2 A 6904 : 1997 Use 3 Classification The classification of gypsum plasters shall be as shown in Table 1. , Water of crystallization content % Plaster proportioned at work site For first coating 10 max. 70 max. 1.0 (0.10) min. 3.0 (0.31) min. - 4.0 mi
17、n. I Preproportioned plasters Preproportioned piaster For first coating For finish coating 20 max. 1 O max. 60 max. 60 max. 0.7 (0.07) min. 1.8 (0.18) min. 0.5 (0.05) min. 1.5 O.iS min. - 8.0 (0.82) min. - - 4 Quality The quality of gypsum plasters shall be as follows : (1) The quality of gypsum pla
18、sters shall conform to the requirements in Table 2. Item Fineness of 850 M m remainder grinding 76 t 106 Mm remainder (I) Bending strength Nimm2 (kgf/mm2 Compressive strength Nimm2 kgf/mm2 Hardness Nimm (kgfimm Note ( I ) Powder passing through 850 pm sieve and remaining on 106 pm sieve. (2) The fol
19、lowing quality shall be specified when necessary. (a) (b) Setting time (c) Bulk density Clicined gypsum content The clicined gypsum content shall be as shown in Annex 1. The setting time shall be as shown in Annex 2. The bulk density which depends on the agreement between the inter- ested parties sh
20、all be determined in accordance with the method specified in Annex 3. 5 Test 5.1 The test portion shall be sampled in accordance with the reasonable method and put in a glass bottle or other container so as to conserve without absorbing humidity and carbon dioxide. Test portion 5.2 shall be carried
21、out in accordance with the following procedure : Proportioning and setting of test sample The preparation and setting of test portion (1) Take the test portion in a container of 11 at the proportion given in Table 3, mix up sufficiently, add an appropriate amount of water and stir up for about three
22、 minutes. In Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 00:15:50 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS A bSU4-ENGL 1997 4933bU8 0547847 78T
23、Classification 5 A 6904 : 1997 Proportion g Total mass of Standard consistency downing portion (depth of penetration of needle mm) Piaster 1 Sand ( I ) g stirring, use a wooden or plastic rod of some 20 mm in diameter and with semispherical end and conduct uniformly at a speed of some 120 times per
24、minute. Fill the container with the stirred test portion, flatten the surface, down calmly the rod for measuring consistency (of hollow aluminium weighing 50 g) of Vicat needle apparatus specified in JIS R 5201 and shown in Attached Fig. 1 on approximately middle place and measure the depth of the p
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