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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
25、enetration of needle. Take the depth of penetration of needle coming to the values given in Table 3 as the standard consistency and take the ratio of the mass of water to the gypsum plaster at that time as the standard mixing water ratio. Put the test portion of standard consistency in a measuring c
26、ontainer, flatten the surface, down calmly the standard needle for initial setting of Vicat needle apparatus specified in JIS R 5201 and make the time when the tip of the needle stops at the point about 3 mm distant from the bottom of container the initial setting. After passing an appropriate time
27、since the initial setting, down calmly the needle again and make the time when the tip of the needle stops at the point about 3 mm deep from the surface of test portion the final setting. (2) I Preproportioned piaster l I -. For finish coating1 300 I -I so 1 -%i 150() Plaster proportioned at work si
28、te I For first coating I 1 For first coatine I 300 I IO* I Notes () () Sand to be used shall be the standard sand specified in JIS R 5201. Put a weight of 100 g on the rod for measuring consistency (50 g). 5.3 20 “C i 2 O C , relative humidity : (65 f 5) % and atmospheric pressure: 86 kPa to 106 kPa
29、. Standard condition The standard condition of the test room shall be the temperature : 5.4 When converting the values measured by meters or measuring machines of the indication based on the traditional units to the numerical values based on the International System of units (SI) shall be in accorda
30、nce with the following equation : Conversion of numerical values 1 kgf = 9.80 N 5.5 The fineness of grinding shall be determined by the following procedure using the sieves of nominal dimensions of 850 pm and 106 pm specified in JIS L 8801. Test on fineness of grinding Dry the test portion of some 2
31、10 g at 40 “C L 4 “C until coming to constant mass ( 4 ) and cool in a desiccator. Weigh two sets of test portion of some 100 g from it to the nearest 0.1 g and screen each of them using a sieve of 850 pm in accordance with the following procedure : Hold the sieve in one hand, slightly tilted, and s
32、hake it at a rate of some 120 times per minute. Shake it, allowing it to strike the other hand on each movement so that the 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 re
33、production or networking permitted without license from IHS -,-,- I 4 A 6904 : 1997 plaster always spreads out evenly. Approximately every 30 movements turn the sieve through 90, give a few sharp taps against the side and recommence the shaking. Consider the sieving is finished when, between two wei
34、ghings carried out at intervals of 1 min, the mass of plaster passing does not exceed 0.4g, and weigh the residue on the 850 pm sieve in each case of two sets of test portion to the nearest 0.1 g and express their arithmetical mean as a rate to the weight of test portion. Next sieve two sets of the
35、test portion which have already passed the 850 pm sieve on the 106 pm sieve, proceeding as in (1). During the sieving, the sieve may, from time to time, be tapped against a solid base and the sieve blocked may be brushed to free holes. Consider the sieving is finished when, between two weighings car
36、ried out at an interval of 1 min, the mass of plaster passing does not exceed 0.1 g, weigh the residue on the 106 pm sieve in each case of two sets of test portion to the nearest 0.1 g () and express their arithmetical mean as a rate to the weight of test portion. (2) Notes ( 4 ) The mass is regarde
37、d as constant when the difference between the result of two successive weighings, separated by 1 h of drying, does not exceed 0.2 g. () The difference between this value and the value obtained by subtracting the residue on the 850 pm sieve and the amount passing the 106 pm sieve from the initial wei
38、ght of test portion shall not exceed 1 %. Remarks 1 In sieving, mechanical sieve may be used, but the final sieving shall be carried out by manual sieving. Clause 4 of Annex 3 may apply in place of (1) to (2). In this case, in place of Note () in 4 (i), the sum total of each mean value of the residu
39、es on the sieves of 400 pm, 200 pm and 100 pm obtained in 4.2 of Annex 3 shall be expressed with the rate to the initial mass of the test portion (100 g). 2 5.6 Bending strength test The bending strength test shall be carried out in accordance with the following procedure : (i) The test sample measu
40、ring 40 mm X 40 mm X 160 mm shall be used. The test portion shall be stirred up at the rate of portioning in 5.2 and poured in the die for forming mortar specimen specified in JIS R 5201. In this case, the test portion shall be formed by suitably tamping so as to prevent arising of so many cavities
41、on the test sample. Three test samples shall be prepared. The test samples shall be allowed to stand calmly in the room for three hours or more after the setting shown in 5.2, dried at 40 O C k4 “C in a desiccator and tested when the mass variation of each test sample does not exceed 0.2 g in six ho
42、urs, recognizing as being in the constant weight dry condition. Testing machine shall, as shown in Attached Fig. 2, consist of two supporting rollers of 10 mm in diameter put at interval of 100 m m I 1 mm, a load applying roller of 10 mm in diameter ( 6 ) and a load cell to which these rollers are a
43、ttachable and capable of measuring the load with precision of 1 % in a scale range of 5 from the maximum value of the scale. (2) 4 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 M
44、DTNo reproduction or networking permitted without license from IHS -,-,- STD. JIS A b704-ENGL 1997 4733b08 059847 552 5 A 6904 : 1997 The both sides at the time of forming the test sample are used as pressurized faces, it is confirmed that the edge of the sample is perpendicular to the rollers and t
45、he load applying roller and the supporting rollers are equal distance and the maximum load is obtained by applying load at such speed that failure occurs in 20 seconds to 40 seconds after starting applying load. The bending strength is calculated by the following formula : F , = 0.023 4w I where, F,
46、: bending strength (N/mm2) kgf/mm2) w , : maximum load (N) kgf Test results are expressed with the average value of three test samples. If one of the results differs by 15 9% or more from the average value, the average value is calculated omitting this value and if two or more results differ by 15 %
47、 or more from the average value, the test is carried out anew on three test samples. Note ( 6 ) The vertical faces passing through the axes of three rollers shall be parallel to each other and this state shall be kept during the test. One of the supporting rollers and the load applying roller shall
48、be shaky a little within the vertical face passing the center of roller because the load is applied evenly in the width direction of the test sample without distortion. Compressive strength test The compressive strength test shall be carried out in accordance with the following procedure : For the t
49、est samples, three fragments cut off in the bending strength test are used. The compressive strength tester specified in JIS R 5201 is used, the both sides at the time of forming test sample are used as the pressurized faces and the maximum load is obtained by applying load to the middle part of the test sample at