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1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 934-2 : 1998 The Eu
2、ropean Standard EN 934-2 : 1997 has the status of a British Standard ICS 91.100.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Admixtures for concrete, mortar and grout Part 2. Concrete admixtures Definitions and requirements Licensed Copy: sheffieldun sheffieldun, na, Tue
3、 Nov 07 06:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI This 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 April 1998 BSI 1998 ISBN 0 580 2923
4、0 4 BS EN 934-2 : 1998 Amendments issued since publication Amd. No.DateText affected National foreword This Part of BS EN 934 has been prepared by subcommittee B/517/3 and is the English language version of EN 934-2 : 1997 Admixtures for concrete, mortar and grout Part 2: Concrete admixtures Definit
5、ions, specifications and conformity criteria, published by the European Committee for Standardization (CEN). This standard is part of a package of standards comprising BS EN 480 Parts 1, 2, 4, 5, 6, 8, 10, 11 and 12, and BS EN 934 : Parts 2 and 6. When all the standards in this package have been pub
6、lished, BS 5075 : Parts 1, 2 and 3 will be amended by deleting clauses that conflict with standards in the package. This standard includes requirements for all the single function admixtures currently covered by BS 5075 : Parts 1, 2 and 3 but not the dual function admixtures such as retarding water-
7、reducing admixtures and retarding superplasticizing admixtures. It is expected that an amendment to this standard, covering the dual function admixtures in BS 5075 : Parts 1 and 3, will be published. Requirements for water resisting admixtures are included. These have also been known as waterproofin
8、g admixtures and integral permeability reducing admixtures but water resisting admixture is the preferred term in BS 6100. Plasticizing/water reducing admixtures and super plasticizing/high range water reducing admixtures are subject to performance requirements at equal w/c ratio and equal consisten
9、ce. The requirement for total chlorine in table 1 refers to ISO 1158. As this test procedure is intended for chlorine based materials, such as PVC, it is probably necessary to use a larger quantity of admixture than that specified in ISO 1158 in order to obtain accurate results within the sensitivit
10、y of the test method. In one set of trials the weight of sample was increased by a factor of five and the reagents diluted from 0,1 N to 0,01 N to obtain an accurate estimate of the chlorine content. Chlorine content is not the same as chloride ion content which should also be determined. A list of
11、organizations represented on this subcommittee can be obtained on request to its secretary. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Cross-references The British Standards that
12、 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 Electronic Catalogue. Compliance with a British Stand
13、ard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 06:41:26 GMT+00:00 2006, Uncont
14、rolled Copy, (c) BSI 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 by any means reserved worldwide for CEN national Members.
15、Ref. No. EN 934-2 : 1997 E EUROPEAN STANDARDEN 934-2 NORME EUROPE ENNE EUROPA ISCHE NORM October 1997 ICS 91.100.30 Descriptors: Construction materials, concrete, mortars : material, grouting, concrete admixtures, definitions, specifications, tests, conformity tests English version Admixtures for co
16、ncrete, mortar and grout Part 2: Concrete admixtures Definitions and requirements Adjuvants pour be ton, mortier et coulis Partie 2: Adjuvants pour be ton De finitions et exigences Zusatzmittel fu r Beton, Mo rtel und Einpremo rtel Teil 2: Betonzusatzmittel Definitionen und Anforderungen This Europe
17、an Standard was approved by CEN on 25 December 1996. 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 co
18、ncerning such national standards 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 o
19、wn language and notified to 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, S
20、weden, Switzerland and United Kingdom. Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 06:41:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 2 EN 934-2 : 1997 BSI 1998 1) The work on this part has ceased until the other parts of the series EN 934 are completed and available. Then the gener
21、al definitions and general requirements which are valid for all types of admixtures will be taken from the other parts and will be compiled in Part 1. Foreword This European Standard has been prepared by Technical Committee CEN/TC 104, Concrete (performance, production, placing and compliance criter
22、ia), of which the secretariat is held by DIN. This standard is a part of the series EN 934 Admixtures for concrete, mortar and grout which additionally comprises the following parts: Part 1:General definitions and general requirements for all the types of admixtures1) Part 3:Admixtures for mortar Pa
23、rt 4:Admixtures for grout Part 5:Admixtures for sprayed concrete Part 6:Sampling, conformity control evaluation of conformity, marking and labelling At the present time all these documents are under preparation by SC 3. This European standard is used with the standards of the EN 480 series which com
24、prises test methods for admixtures. 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 April 1998, and conflicting national standards shall be withdrawn at the latest by April 1998. According to the
25、CEN/CENELEC 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, Swe
26、den, Switzerland and the United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions4 4Requirements4 5Sampling8 6Conformity control8 7Evaluation of conformity8 8Marking and labelling8 Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 06:41:26 GMT+00:00 2006, Uncontrolled
27、 Copy, (c) BSI Page 3 EN 934-2 : 1997 BSI 1998 1 Scope This European Standard specifies definitions and requirements for admixtures for use in concrete. It covers admixtures for plain, reinforced and prestressed concrete which are used in site mixed, ready mixed concrete and precast concrete. The pe
28、rformance requirements in this standard apply to admixtures used in concrete of normal consistence. They may not be applicable to admixtures intended for other types of concrete such as semi-dry and earth moist mixes. A definition of multifunction admixtures is included but requirements for these ad
29、mixtures have not been prepared. Provisions governing the practical application of admixtures in the production of concrete, i.e. requirements concerning composition, mixing, placing, curing, etc., of concrete containing admixtures, are not part of this standard. 2 Normative references This European
30、 Standard incorporates, 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 ap
31、ply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 480-1Admixtures for concrete, mortar and grout Test methods Part 1: Reference concrete and reference mortar for testing EN 480-2Ad
32、mixtures for concrete, mortar and grout Test methods Part 2: Determination of setting time EN 480-4Admixtures for concrete, mortar and grout Test methods Part 4: Determination of bleeding of concrete EN 480-5Admixtures for concrete, mortar and grout Test methods Part 5: Determination of capillary ab
33、sorption EN 480-6Admixtures for concrete, mortar and grout Test methods Part 6: Infrared analysis EN 480-8Admixtures for concrete, mortar and grout Test methods Part 8: Determination of the conventional dry material content EN 480-10Admixtures for concrete, mortar and grout Test methods Part 10: Det
34、ermination of the water soluble chloride content prEN 480-11 Admixtures for concrete, mortar and grout Test methods Part 11: Determination of air void characteristics in hardened concrete EN 480-12Admixtures for concrete, mortar and grout Test methods Part 12: Determination of the alkali content prE
35、N 934-6Admixtures for concrete, mortar and grout Part 6: Sampling, conformity control, evaluation of conformity, marking and labelling prEN 1015-13 Methods of test for mortar for masonry Part 13: Determination of the dimensional stability of hardened mortars prEN 12358Testing concrete Determination
36、of consistency Flow table test prEN 12382Testing concrete Determination of the consistency Slump test prEN 12394Testing concrete Determination of compressive strength of test specimens prEN 12395Testing concrete Determination of air content of fresh concrete Pressure method ISO 758Liquid chemical pr
37、oducts for industrial use Determination of density at 20 8C ISO 1158Plastics Vinyl chloride homopolymers and copolymers Determination of chlorine ISO 4316Surface active agents Determination of pH of aqueous solutions Potentiometric method Licensed Copy: sheffieldun sheffieldun, na, Tue Nov 07 06:41:
38、26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Page 4 EN 934-2 : 1997 BSI 1998 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 General definitions 3.1.1 performance Ability of an admixture to be effective in its intended use without detrimental effects. 3.1.2 com
39、pliance dosage The dosage of an admixture, expressed in % by mass of cement, stated by the manufacturer which will meet the requirements of this standard. The compliance dosage is within the recommended range of dosage. 3.1.3 recommended range of dosage Dosages between limits expressed in % by mass
40、of cement which the manufacturer recommends for the product based on experience on site. NOTE.The use of the recommended dosage does not imply that compliance with this standard will be met over the whole range. Trial tests should be carried out with the materials to be used on site to find the dosa
41、ge necessary to achieve the required result. 3.1.4 maximum recommended dosage Upper limit of the recommended range of dosage. 3.1.5 reference concrete and mortar Concrete and mortar as specified in EN 480-1 for testing admixtures for conformity with this standard. 3.2 Specific definitions 3.2.1 admi
42、xtures for concrete Material added during the mixing process of concrete in a quantity not more than 5 % by mass of the cement content of the concrete, to modify the properties of the mix in the fresh and/or hardened state. 3.2.2 water reducing/plasticizing admixture Admixture which without affectin
43、g the consistence, permits a reduction in the water content of a given concrete mix, or which, without affecting the water content, increases the slump/flow or produces both effects simultaneously. 3.2.3 high range water reducing/superplasticizing admixture Admixture which, without affecting the con
44、sistence, permits a high reduction in the water content of a given concrete mix, or which, without affecting the water content, increases the slump/flow considerably, or produces both effects simultaneously. 3.2.4 water retaining admixture Admixture which reduces the loss of water by a reduction of
45、bleeding. 3.2.5 air entraining admixture Admixture which allows a controlled quantity of small, uniformly distributed air bubbles to be incorporated during mixing which remain after hardening. 3.2.6 set accelerating admixture Admixture which decreases the time to commencement of transition of the mi
46、x from the plastic to the rigid state. 3.2.7 hardening accelerating admixture Admixture which increases the rate of development of early strength in the concrete, with or without affecting the setting time. 3.2.8 set retarding admixture Admixture which extends the time to commencement of transition
47、of the mix from the plastic to the rigid state. 3.2.9 water resisting admixture Admixture which reduces the capillary absorption of hardened concrete. 3.2.10 multifunction admixture Admixture which affects several properties of fresh and/or hardened concrete by performing more than one of the main f
48、unctions defined in 3.2.2 to 3.2.9. 4 Requirements The requirements in this standard assume that admixtures are uniformly dispersed in concrete; special attention shall be given to the dispersion of powder admixtures with retarding effects. All the admixtures defined in this standard shall conform t
49、o the general requirements in table 1. The admixtures defined in 3.2.1 to 3.2.9 shall conform to the corresponding performance requirements in Tables 2 to 9, which cover the main functions and limit some secondary effects. High range water reducing/superplasticizing admixtures shall conform to the requirements in Table 3.1 and Table 3.2. Where manufacturers stated values are required, these shall be provided in writing on request. NOTE. Admixtures should not lead to a significant change in