1、BSI Standards PublicationBS 7979:2016Specification for limestonefines for use with PortlandcementPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. The British Standards Institution 2016Published by BSI Standards Limite
2、d 2016ISBN 978 0 580 91808 7ICS 91.100.10The following BSI references relate to the work on this document:Committee reference B/516/6Draft for comment 15/30330848 DCPublication historyFirst published, July 2001Second (present) edition, January 2016Amendments issued since publicationDate Text affecte
3、dBS 7979:2016 BRITISH STANDARDContents1 Scope 12 Normative references 13 Terms and definitions 14 Composition 25 Moisture content 36 Compressive strength 37 Physical properties 38 Marking 49 Information to be provided by the manufacturer 410 Sampling and testing for acceptance inspection at delivery
4、 5AnnexesAnnex A (informative) Product guidance 7Annex B (normative) Conformity assessment 8Annex C (normative) Method of determining the moisture content 11Bibliography 13List of tablesTable 1 Acceptance inspection limits 6Table B.1 Minimum testing frequencies 8Table B.2 Conformity criteria 9Table
5、B.3 Acceptability constant kA10Table B.4 Values of CA11Table B.5 Limit values for single results 11Summary of pagesThis document comprises a front cover, an inside front cover, pages i to ii,pages 1 to 14, an inside back cover and a back cover.BRITISH STANDARD BS 7979:2016 The British Standards Inst
6、itution 2016 iForewordPublishing informationThis British Standard is published by BSI Standards Limited, under licence fromThe British Standards Institution, and came into effect on 31 January 2016. Itwas prepared by Subcommittee B/516/6, Cement specifications, under theauthority of Technical Commit
7、tee B/516, Cement and lime. A list oforganizations represented on these committees can be obtained on request toits secretary.SupersessionThis British Standard supersedes BS 7979:2001, which is withdrawn.Information about this documentThis new edition of BS 7979 incorporates technical changes only.
8、It does notrepresent a full review or revision of the standard, which will be undertaken indue course.Presentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Itsrequirements are expressed in sentences in which the principal auxiliary verb is“shall”.Comme
9、ntary, explanation and general informative material is presented insmaller italic type, and does not constitute a normative element.Requirements in this standard are drafted in accordance with Rules for thestructure and drafting of UK standards, subclause J.1.1, which states,“Requirements should be
10、expressed using wording such as:When tested asdescribed in Annex A, the product shall .”. This means that only those productsthat are capable of passing the specified test will be deemed to conform to thisstandard.Contractual and legal considerationsThis publication does not purport to include all t
11、he necessary provisions of acontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legalobligations.BRITISH STANDARDBS 7979:2016ii The British Standards Institution 20161 ScopeThis British Standard specifies requirements for the pro
12、duction, chemicalcomposition and mechanical and physical properties of limestone fines for use incombination with CEM I Portland cement strength class 42.5 or higherconforming to BS EN 197-1 as a component of concrete, mortar or grout. It alsospecifies requirements for marking, provision of informat
13、ion, sampling andtesting for acceptance at delivery, and conformity criteria for the manufacturersautocontrol system.Guidance on the use of limestone fines is given in Annex A.2 Normative referencesThe following normative documents contain provisions which, through referencein this text, constitute
14、provisions of this British Standard. For dated references,subsequent amendments to, or revisions of, any of these publications do notapply. For undated references, the latest edition of the publication referred toapplies.BS 6100-9, Building and civil engineering Vocabulary Part 9: Work withconcrete
15、and plasterBS EN 196-1, Methods of testing cement Part 1: Determination of strengthBS EN 196-2:2013, Methods of testing cement Part 2: Chemical analysis ofcementBS EN 196-3:1995, Methods of testing cement Part 3: Determination of settingtime and soundnessBS EN 196-7:2007, Methods of testing cement P
16、art 7: Methods of taking andpreparing samples of cementBS EN 197-1, Cement Part 1: Composition, specifications and conformity criteriafor common cementsBS EN 451-2, Method of testing fly ash Part 2: Determination of fineness bywet sievingBS EN 933-9, Tests for geometrical properties of aggregates Pa
17、rt 9: Assessmentof fines Methylene blue testBS EN 933-10, Tests for geometrical properties of aggregates Part 10:Assessment of fines Grading of filler aggregates (air jet sieving)BS EN 1744-1, Tests for chemical properties of aggregates Part 1: ChemicalanalysisBS EN 13639, Determination of total org
18、anic carbon in limestone3 Terms and definitionsFor the purposes of this British Standard, the terms and definitions given inBS 6100-9 and the following apply.3.1 additiveconstituent, other than those specified in 4.2, which is added to facilitate theproduction of limestone fines3.2 characteristic va
19、luevalue of a required property outside which lies a specified percentage, Pk, of allthe values of the populationBRITISH STANDARD BS 7979:2016 The British Standards Institution 2016 13.3 limestone finesfine powder obtained from the processing of limestoneNOTE Specially selected calcareous materials
20、with an appropriate particle sizedistribution can improve the physical properties (such as workability) and reducebleeding of the concrete.3.4 lotquantity of limestone fines, produced under conditions presumed uniform3.5 single result limit valuevalue which, for any single test result, in the case o
21、f an upper limit is not to beexceeded or in the case of a lower limit is a minimum to be reached3.6 spot samplesample taken at one time and from one placeNOTE A spot sample may be obtained by combining one or more immediatelyconsecutive incremental samples.4 Composition4.1 GeneralLimestone fines sha
22、ll be correctly prepared, i.e. selected, homogenized andcomminuted depending on their state of production or delivery.During the production of limestone fines and their control, the composition andrequirements specified in this British Standard shall be maintained.Limestone fines shall be subjected
23、to the conformity assessment specified inAnnex B.4.2 Chemical composition4.2.1 Calcium carbonateWhen determined in accordance with the method given inBS EN 196-2:2013, 4.5.12 or 4.5.14, for calcium oxide, and expressed as calciumcarbonate, the calcium carbonate content shall be not less than a mass
24、fractionof 75% of the limestone fines.NOTE The preferred method for this test is given in BS EN 196-2:2013, 4.5.12.4.2.2 ChlorideWhen determined in accordance with BS EN 196-2:2013, Clause 4, the chloridecontent shall be not greater than a mass fraction of 0.1% of the limestone fines.NOTE BS 8500-1
25、gives recommendations for the maximum total chloride content ofconcrete mixes for various applications.4.2.3 Total sulfurWhen determined in accordance with BS EN 1744-1, the total sulfur content(expressed as sulfate, SO4) shall be not greater than a mass fraction of 1% of thelimestone fines.4.2.4 Cl
26、ay contentWhen determined in accordance with BS EN 933-9, the methylene blueadsorption (which indicates the clay content) shall be not greater than 1.2 gblue per 100 g of limestone fines.BRITISH STANDARDBS 7979:20162 The British Standards Institution 20164.2.5 Organic material contentWhen determined
27、 in accordance with BS EN 13639, the organic material contentshall be not greater than a mass fraction of 0.5% of the limestone fines.4.2.6 AdditivesThe total quantity of additives shall not exceed a mass fraction of 1% of thelimestone fines.Additives shall be acceptable for use only if they are kno
28、wn not to promotecorrosion of the reinforcement or impair the properties of the limestone fines orof the concrete or mortar made from the combination of the limestone finesand cement.5 Moisture contentWhen determined in accordance with Annex C, the moisture content shall benot greater than a mass fr
29、action of 0.5% of the limestone fines.6 Compressive strength6.1 Limestone fines with CEM I Portland cement of strengthclass 42.5When tested in accordance with BS EN 196-1, a combination consisting of 80%CEM I Portland cement of strength class 42.5 conforming to BS EN 197-1,and 20% limestone fines, s
30、hall have the following compressive strength:a) at 7 days: 16.0 N/mm2;b) at 28 days: 32.5 N/mm2and 52.5 N/mm2.6.2 Limestone fines with CEM I Portland cement of strengthclass 52.5When tested in accordance with BS EN 196-1, a combination consisting of 80%CEM I Portland cement of strength class 52.5 co
31、nforming to BS EN 197-1,and 20% limestone fines, shall have the following compressive strength:a) at 2 days: 10.0 N/mm2;b) at 28 days: 42.5 N/mm2and 62.5 N/mm2.NOTE The recommended procedure for determining conformity to strength classcriteria for combinations of limestone fines and CEM I Portland c
32、ement is given inBS 8500-2:2015, Annex A.7 Physical properties7.1 FinenessWhen determined in accordance with BS EN 451-2 or BS EN 933-10, the finenessof the limestone fines expressed as the proportion by mass retained on a 45 mtest sieve shall not exceed 10.0%.In case of dispute, wet sieving to BS E
33、N 451-2 shall be the reference method.BRITISH STANDARD BS 7979:2016 The British Standards Institution 2016 37.2 Initial setting timeWhen determined in accordance with BS EN 196-3, a paste of standardconsistence made from a combination consisting of 80% CEM I Portland cementof strength class 42.5 or
34、higher conforming to BS EN 197-1, and 20% limestonefines, shall have an initial setting time of not less than 75 min.7.3 SoundnessWhen determined in accordance with BS EN 196-3, a paste of standardconsistence made from a combination consisting of 80% CEM I Portland cementof strength class 42.5 or hi
35、gher conforming to BS EN 197-1, and 20% limestonefines, shall have an expansion of not more than 10 mm.8 MarkingLimestone fines shall be marked on the bag or the delivery note, and on anytest report, with the following particulars:a) name, trademark or other means of identification of the manufactur
36、er tofacilitate traceability to the works in which the limestone fines wereproduced;b) name of the material, i.e. limestone fines;c) number and date of this British Standard, i.e. BS 7979:20161).9 Information to be provided by the manufacturer9.1 Test reportIf a test report is requested by the purch
37、aser, it shall contain the followinginformation2):a) calcium carbonate content of the limestone fines (see 4.2.1);b) chloride content of the limestone fines (see 4.2.2);c) compressive strength of the combination (see Clause 6);d) fineness of the limestone fines (see 7.1);e) initial setting time of t
38、he combination (see 7.2);f) soundness of the combination (see 7.3);g) source of the CEM I Portland cement used in the tests, and its setting timeand compressive strength at either two days (class 42.5) or seven days(class 52.5) and 28 days when tested in the laboratory which is testing itscombinatio
39、n with the limestone fines.1)Marking BS 7979:2016 on or in relation to a product represents a manufacturersdeclaration of conformity, i.e. a claim by or on behalf of the manufacturer that theproduct meets the requirements of the standard. The accuracy of the claim is solelythe claimants responsibili
40、ty. Such a declaration is not to be confused with third-partycertification of conformity.2)The test report should be available from the manufacturer.BRITISH STANDARDBS 7979:20164 The British Standards Institution 20169.2 Additional informationThe following information shall also be supplied to the p
41、urchaser, if requestedat the time of ordering:a) declared mean alkali content, expressed as the sodium oxide equivalent,determined in accordance with BS EN 196-2, which will not be exceededwithout prior notice from the manufacturer;b) an indication of the variability of the chloride content when its
42、 mean levelexceeds a mass fraction of 0.05% (see 4.2.2);c) total sulfur content (see 4.2.3);d) clay content (see 4.2.4);e) organic material content (see 4.2.5).10 Sampling and testing for acceptance inspection atdelivery10.1 If, at the request of the purchaser, the manufacturer carries out samplinga
43、nd testing for assessment of conformity at delivery, the procedures specified into 10.2, 10.3 and 10.4 shall be followed.10.2 A spot sample of the limestone fines shall be taken in accordance withBS EN 196- 7:2007, 6.2, 6.3, 6.4 or 6.5 either before, or at the time of, delivery.A laboratory sample s
44、hall be prepared and packed in accordance withBS EN 196-7:2007, Clauses 8 and 9. A sampling report shall be completed at thetime of sampling and shall be attached to the laboratory sample in accordancewith BS EN 196-7:2007, Clause 10.NOTE 1 Testing may be delayed for up to 3 months from the time of
45、sampling,provided that there is confirmation that the sample has been stored continuously asspecified in BS EN 196-7:2007, 9.2.NOTE 2 When the limestone fines in combination with cement are tested forstrength (see Clause 6), it is recommended that the pit or quarry from which theCEN Standard sand (s
46、ee BS EN 196-1) is obtained, and the compaction procedure tobe used, should be those in use by the manufacturer at the time the limestone fineswere originally tested.NOTE 3 The source of CEN Standard sand and the compaction procedure caninfluence the strength achieved (see BS EN 196-1).10.3 When the
47、 chemical composition of the limestone fines is analyzed (see 4.2),the sample shall be prepared by the procedure described in BS EN 196-2.10.4 When tested in accordance with the methods specified in Table 1, thesample shall conform to the values specified in Clauses 4, 5, 6 and 7, within thelimits s
48、pecified in Table 1.BRITISH STANDARD BS 7979:2016 The British Standards Institution 2016 5Table 1 Acceptance inspection limitsProperty Test method specified in DeviationA)not in excess ofCompositionCalcium carbonate content BS EN 196-2:2013, 4.5.12B) 5.0%Chloride content BS EN 196-2 + 0.01%Total sul
49、fur content BS EN 1744-1 + 0.1%Clay content BS EN 933-9 + 0.1 g/100 gOrganic material content BS EN 13639 + 0.1%Moisture contentMoisture content Annex C + 0.1%Compressive strength2 day strength (lower limit) BS EN 196-1 2.0 N/mm27 day strength (lower limit) BS EN 196-1 2.0 N/mm228 day strength (lower limit) BS EN 196-1 2.5 N/mm2Physical propertiesFineness BS EN 451-2 or BS EN 933-10 + 0.5%Initial setting time BS EN 196-3 15.0 minSoundness BS EN 196-3 + 1.0 mmA)The deviation from the requirements specified in Cla
