1、BRITISH STANDARDBS 8443:2005Specification for establishing the suitability of special purpose concrete admixturesICS 91.100.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60
2、g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 20 January 2006 BSI 20 January 2006The following BSI references relate
3、to the work on this British Standard:Committee reference B/517/3Draft for comment 05/30099595 DCISBN 0 580 47559 XCommittees responsible for this British StandardThe preparation of this British Standard was entrusted by Technical Committee, B/517, Concrete, to Subcommittee B/517/3, Admixtures, upon
4、which the following bodies were represented:Brick Development AssociationBritish Cement AssociationBritish Precast Concrete Federation Ltd.Cement Admixtures AssociationCERAM Research Ltd.Concrete SocietyQuarry Products AssociationInstitute of Concrete TechnologyInstitution of Civil EngineersSociety
5、of Chemical IndustryODPM Represented by BRECo-opted membersAmendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005 BSI 20 January 2006iContentsPageCommittees responsible Inside front coverForeword ii1S
6、cope 12 Normative references 13 Terms, definitions, symbols and abbreviations 24 Requirements 35Sampling 66 Conformity control 67 Evaluation of conformity 68 Marking and labelling 7Annex A (normative) Determination of washout 9Annex B (normative) Determination of the drying shrinkage of concrete 10A
7、nnex C (normative) Determination of segregation in concrete 11Annex D (normative) Stability of foamed concrete 13Figure C.1 Slump flow segregation 12Table 1 General requirements 4Table 2 Specific requirements for underwater concrete admixtures (at equal w/c) 5Table 3 Specific requirements for shrink
8、age reducing admixtures (at equal w/c ratio) 5Table 4 Specific requirements for corrosion inhibiting admixtures (at equal consistence) 5Table 5 Specific requirements for pumping aids (at equal consistence) 5Table 6 Specific requirements for segregation reducing admixtures (at equal consistence) 6Tab
9、le 7 Specific requirements for foaming admixtures 6Table 8 Minimum frequency of test for FPC 8Licensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005ii BSI 20 January 2006ForewordThis British Standard has been prepared by Subcommittee B/517/3.It is intended
10、to establish the suitability of seven categories of special purpose concrete admixtures that are in widespread use in the United Kingdom and that are not covered by BS EN 934-2, Admixtures for concrete, mortar and grout Part 2: Concrete admixtures Definitions, requirements, conformity, marking and l
11、abelling.The requirements follow the format established by BS EN 934-2. However, for some of the admixtures, there is no internationally agreed laboratory test available to measure their effectiveness in relation to the primary function. In these cases, the effectiveness is required to be agreed bet
12、ween the manufacturer and purchaser.This British Standard calls for the use of substances and/or procedures that may be injurious to health if adequate precautions are not taken. It refers only to technical suitability and does not absolve the user from legal obligations relating to health and safet
13、y at any stage.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis document comprises a front cover
14、, an inside front cover, pages i and ii, pages 1 to 13 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Licensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005 BSI 20 January 200611 ScopeThis Br
15、itish Standard specifies terms, definitions and requirements for special purpose admixtures in order to establish suitability for use in concrete conforming to BS EN 206-1.The admixtures covered are listed as follows; they are intended for use in plain, reinforced, foamed, prestressed and semi-dry c
16、oncrete as appropriate. The concrete can be site mixed, ready mixed or pre-cast: underwater concrete admixtures; shrinkage reducing admixtures; corrosion inhibiting admixtures; pumping aids; segregation reducing admixtures; foaming admixtures; semi-dry concrete admixtures.Provisions governing the pr
17、actical application of admixtures in the production of concrete, i.e. requirements concerning composition, mixing, placing, curing, etc. of concrete containing admixtures are not within the scope of this standard.2 Normative referencesThe following referenced documents are indispensable for the appl
18、ication of this document. For dated references, only the reference cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS EN 206-1, Concrete Part 1: Specification, performance, production and conformity.BS EN 480-1, Admixtures for c
19、oncrete, mortar and grout Test methods Part 1: Reference concrete and reference mortar for testing.BS EN 480-2, Admixtures for concrete, mortar and grout Test methods Part 2: Determination of setting time.BS EN 480-6, Admixtures for concrete, mortar and grout Test methods Part 6: Infrared analysis.B
20、S EN 480-8, Admixtures for concrete, mortar and grout Test methods Part 8: Determination of the conventional dry material content.BS EN 480-10, Admixtures for concrete, mortar and grout Test methods Part 10: Determination of the water soluble chloride content.BS EN 480-12, Admixtures for concrete, m
21、ortar and grout Test methods Part 12: Determination of the alkali content of admixtures.BS EN 934-2, Admixtures for concrete, mortar and grout Part 2: Concrete admixtures Definitions, requirements, conformity, marking and labelling.BS EN 934-3, Admixtures for concrete, mortar and grout Part 3: Admix
22、tures for masonry mortar Definitions, requirements, conformity, marking and labelling.BS EN 934-6, Admixtures for concrete, mortar and grout Part 6: Sampling, conformity control and evaluation of conformity.BS EN 12350-2, Testing fresh concrete Part 2: Slump test.BS EN 12350-6, Testing fresh concret
23、e Part 6: Density.BS EN 12350-7, Testing fresh concrete Part 7: Air content Pressure method.BS EN 12390-1, Testing hardened concrete Part 1: Shape, dimensions and other requirements for specimens and moulds.BS EN 12390-3, Testing hardened concrete Part 3: Compressive strength of test specimens.BS EN
24、 12620, Aggregates for concrete.ISO 649-2, Laboratory glassware Density hydrometers for general purposes Part 2: Test methods and use.ISO 4316, Surface active agents Determination of pH of aqueous solutions Potentiometric method.Licensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled
25、 Copy, (c) BSIBS 8443:20052 BSI 20 January 20063 Terms, definitions, symbols and abbreviations3.1 Terms and definitionsFor the purposes of this standard, the following terms and definitions apply.3.1.1 General terms and definitions3.1.1.1 performanceability of an admixture to be effective in its int
26、ended use without detrimental effects3.1.1.2 compliance dosagedosage of an admixture, expressed as percent 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 dosage3.1.1.3 recommended range of dos
27、agedosage between limits expressed as percent by mass of cement, which the manufacturer recommends for the product, based on experience in useNOTE 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 w
28、ith the materials to be used on site to find the dosage necessary to achieve the required performance.3.1.1.4 maximum recommended dosageupper limit of the recommended range of dosage3.1.1.5 reference concreteconcrete composition specified for testing admixtures for conformity with this standard3.1.1
29、.6 reference mortarmortar composition specified for testing admixtures for conformity with this standard3.1.1.7 primary functiona single function of a multifunction admixture designated by the manufacturer3.1.1.8 general requirementsrequirements that characterize the admixture by physical and chemic
30、al measurements3.1.1.9 specific requirementsrequirements that characterize the performance of the admixture in a cementitous mix3.1.2 Specific terms and definitions3.1.2.1 admixtures for concretematerials added during the mixing process of concrete, in a quantity not normally exceeding 5 % by mass o
31、f the cement content of the concrete, to modify the properties of the mix in the fresh and/or hardened state3.1.2.2 underwater concrete admixtureadmixture that significantly reduces the washout of cement during the underwater placing and hardening of concrete3.1.2.3 shrinkage reducing admixtureadmix
32、ture that, without water reduction, brings about a significant reduction in drying shrinkage of concreteLicensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005 BSI 20 January 200633.1.2.4 corrosion inhibiting admixtureadmixture that reduces the likelihood of
33、 corrosion of steel, embedded in concrete3.1.2.5 pumping aidadmixture that reduces pumping pressure and/or the tendency for blockages in pump lines during pumping of concrete3.1.2.6 segregation reducing admixtureadmixture that modifies the mix viscosity to reduce segregation of concreteNOTE Segregat
34、ion reducing admixtures are often called viscosity modifying admixtures (VMA).3.1.2.7 foaming admixtureadmixture that uses air to produce a stable low density concrete or mortar3.1.2.8 semi-dry concrete admixtureadmixture that is incorporated into semi-dry concrete to improve the moulding process an
35、d/or hardened properties of the mix3.2 Symbols and abbreviations4 Requirements4.1 General requirementsAll the admixtures defined in this British Standard shall conform to the general requirements in Table 1.NOTE The requirements in this British Standard assume that admixtures are uniformly dispersed
36、 in concrete; special attention should be given to the dispersion of powder admixtures.4.2 Information to be provided by the manufacturerThe following information shall be documented and provided on request by the manufacturer: recommended range of dosage; limit of segregation for homogeneity; descr
37、iption of colour; relative density (liquids only); conventional dry material content; pH value (liquids only); the setting time at the compliance dosage; maximum water soluble chloride content; maximum alkali content.FPC Factory production controlITT Initial type testingLicensed Copy: Wang Bin, na,
38、Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:20054 BSI 20 January 2006Table 1 General requirements4.3 Requirements for specific types of admixtureThe specific requirements of these guidelines cover performance in a cementitous mix where suitable laboratory tests are available.NOTE
39、 For some admixtures, suitable laboratory tests are not available or the performance of the primary function is specific to the materials and equipment used on site and can only be demonstrated by purchaser trials. In this situation, effectiveness for purpose is required to be established by agreeme
40、nt between the purchaser and the manufacturer based on trials and performance information provided by the manufacturer.The admixtures shall conform to the following specific requirements:No Property Test method Requirements1 Homogeneity Visual Homogeneous when used. Segregation shall not exceed the
41、limit stated by the manufacturer2 Colour Visual Uniform and similar to the description provided by the manufacturer3 Effective component BS EN 480-6aIR spectra to show no significant change with respect to the effective components when compared to reference spectrum provided by the manufacturer4 Rel
42、ative densitybISO 649-2aD 0.03 if D 1.10D 0.02 if D k 1.10where D is manufacturers stated value5 Conventional dry material contentBS EN 480-8a0.95T k X 1.05T for T U 20 %0.90T k X 1.10T for T 20 %T is manufacturers stated value % by mass X is test result % by mass6 pH valuebISO 4316aManufacturers st
43、ated value 1 or within manufacturers stated range7 Effect on setting BS EN 480-2 Report results at the compliance dosage in reference mortar with CEM 1 cement8 Water soluble chloride (Cl)BS EN 480-10 Either k 0.10 % by masscor not above the manufacturers stated value9 Alkali content (Na2O equivalent
44、)BS EN 480-12 Not above the manufacturers stated maximumaThe manufacturer is permitted to recommend an alternative test method for both ITT and FPC if the method specified is unsuitable for the particular admixture.bLiquid admixtures only.cWhere the chloride content is k 0.10 % by mass the admixture
45、 may be described as “chloride free”. underwater concrete admixtures: Table 2; shrinkage reducing admixtures: Table 3; corrosion inhibiting admixtures: Table 4; pumping aids: Table 5; segregation reducing admixtures: Table 6; foaming admixtures: Table 7; semi-dry concrete admixtures: No suitable lab
46、oratory tests are available. Performance can only be demonstrated by suitable purchaser trials, which shall include the effects on hardened concretes by tests of compressive or flexural strengths.Licensed Copy: Wang Bin, na, Mon Apr 10 08:22:22 BST 2006, Uncontrolled Copy, (c) BSIBS 8443:2005 BSI 20
47、 January 20065Table 2 Specific requirements for underwater concrete admixtures (at equal w/c)Table 3 Specific requirements for shrinkage reducing admixtures (at equal w/c ratio)aTable 4 Specific requirements for corrosion inhibiting admixtures (at equal consistence)aTable 5 Specific requirements for
48、 pumping aids (at equal consistence)aNo Property Reference concrete Test method Requirement1 ConsistenceaBS EN 480-1reference concrete 1bSlumpBS EN 12350-2Control mix (70 10) mmTest mix U 170 mma2 Washout BS EN 480-1reference concrete 1bAnnex A Loss of mass k 15 %3 Compressive strengthBS EN 480-1ref
49、erence concrete 1bBS EN 12390-3 At 7 and 28 daysTest mix U 75 % of control mix4 Plastic density BS EN 480-1reference concrete 1bBS EN 12350-6 Test mix density = control mixdensity 150 kg/m3aIf the manufacturer recommends the separate addition of a superplasticizer to give the required consistence in the test mix, this is permitted but the quantity and type shall be recorded in the ITT test result document.bThe cement content of reference concrete 1 shall
