BS 1881-119-2011 Testing concrete Method for determination of compressive strength using portions of beams broken in flexure (equivalent cube method)《混凝土试验 第119部分 用部分弯曲断裂梁测定抗压强度的方法.pdf

《BS 1881-119-2011 Testing concrete Method for determination of compressive strength using portions of beams broken in flexure (equivalent cube method)《混凝土试验 第119部分 用部分弯曲断裂梁测定抗压强度的方法.pdf》由会员分享，可在线阅读，更多相关《BS 1881-119-2011 Testing concrete Method for determination of compressive strength using portions of beams broken in flexure (equivalent cube method)《混凝土试验 第119部分 用部分弯曲断裂梁测定抗压强度的方法.pdf（12页珍藏版）》请在麦多课文档分享上搜索。

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS 1881-119:2011Testing concrete Part 119: Method for determinationof compressive strength usingportions of beams broken in flexure(equivalent cube method)Publishing and copyrigh

2、t informationThe BSI copyright notice displayed in this document indicates when the documentwas last issued. BSI 2011ISBN 978 0 580 75324 4ICS 91.100.30The following BSI references relate to the work on this standard:Committee reference B/517Draft for comment 11/30246289 DCPublication historyFirst e

3、dition December 1983Second (present) edition December 2011Amendments issued since publicationDate Text affectedBS 1881-119:2011 BRITISH STANDARDContentsForeword ii1 Scope 12 Normative references 13 Terms and definitions 14 Apparatus 15 Test specimens 16 Procedure 27 Calculation and expression of res

4、ults 38 Test report 3Bibliography 4List of figuresFigure1Atypical jig locating specimens for the compression test on beamsbroken in flexure 2Summary of pagesThis document comprises a front cover, an inside front cover, pages i to iv,pages 1 to 4, an inside back cover and a back cover.BRITISH STANDAR

5、D BS 1881-119:2011 BSI 2011 iForewordPublishing informationThis part of BS 1881 was published by BSI and came into effect on30 November 2011. It was prepared by Subcommittee B/517/1, Concreteproduction and testing, under the authority of Technical Committee B/517,Concrete and related products. A lis

6、t of organizations represented on thesecommittees can be obtained on request to their secretary.SupersessionThis part of BS 1881 supersedes BS 1881-119:1983, which is withdrawn.Relationship with other publicationsBS 1881 contains test methods for concrete currently used in the UK whichare not covere

7、d by BS EN 12350 (all parts), BS EN 12390 (all parts) andBS EN 12504. Reference is made to the relevant part of BS EN 12350,BS EN 12390 and BS EN 12504 where appropriate. These test methods should beused in conjunction with BS EN 206-1.BS 1881 is published in the following parts: BS 1881-113, Method

8、 for making and curing no-fines cubes; BS 1881-119, Method for determination of compressive strength usingportions of beams broken in flexure (equivalent cube method); BS 1881-122, Method for determination of water absorption; BS 1881-124, Methods for analysis of hardened concrete; BS 1881-125, Meth

9、od for mixing and sampling fresh concrete in thelaboratory; BS 1881-128, Method for analysis of fresh concrete; BS 1881-129, Method for the determination of density of partiallycompacted semi-dry fresh concrete; BS 1881-130, Method for temperature matched curing of concretespecimens; BS 1881-131, Me

10、thods for testing cement in a reference concrete; BS 1881-201, Guide to the use of non-destructive methods of test forhardened concrete; BS 1881-204, Recommendations on the use of electromagnetic covermeters; BS 1881-206, Recommendations for determination of strain in concrete; BS 1881-207, Recommen

11、dations for the assessment of concrete strength bynear-to-surface tests; BS 1881-208, Recommendations for the initial surface absorption ofconcrete; BS 1881-209, Recommendations for the measurement of dynamic modulusof elasticity of concrete; DD 216, Determination of chloride content of fresh concre

12、te.Information about this documentThis is a full revision of the standard.BRITISH STANDARDBS 1881-119:2011ii BSI 2011In this compressive strength test on portions of broken beams the application ofthe test load is the same method and to the same precision as for the cubecompression test.A suitable j

13、ig with auxiliary platens which give a more positive location of thespecimen is illustrated.No estimate is given for repeatability or reproducibility in this part of this BritishStandard. Reference should be made to BS ISO 5725-2 for further informationon the determination of repeatability and repro

14、ducibility.Hazard warningsWhere skin is in contact with fresh concrete, skin irritations are likely to occurowing to the alkaline nature of cement. The abrasive effects of sand andaggregate in the concrete can aggravate the condition. Potential effects rangefrom dry skin, irritant contact dermatitis

15、, to severe burns in cases of prolongedexposure. Take precautions to avoid dry cement entering the eyes, mouth andnose when mixing mortar or concrete by wearing suitable protective clothing.Take care to prevent fresh concrete from entering boots and use workingmethods that do not require personnel t

16、o kneel in fresh concrete. Unlike heatburns, cement burns might not be felt until some time after contact with freshconcrete, so there might be no warning of damage occurring. If cement orconcrete enters the eye, immediately wash it out thoroughly with clean waterand seek medical treatment without d

17、elay. Wash wet concrete off the skinimmediately. Barrier creams may be used to supplement protective clothing butare not an alternative means of protection.Use of this documentIt has been assumed in the preparation of this British Standard that theexecution of its provisions will be entrusted to app

18、ropriately qualified andexperienced people, for whose use it has been produced.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”.Commentary, explanation and

19、general informative material is presented insmaller italic type, and does not constitute a normative element.Contractual and legal considerationsThis publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.Compliance with a

20、 British Standard cannot confer immunity from legalobligations.BRITISH STANDARD BS 1881-119:2011 BSI 2011 iiiBRITISH STANDARDBS 1881-119:2011This page deliberately left blankiv BSI 20111 ScopeThis part of BS 1881 describes an equivalent cube method for determining thecompressive strength of hardened

21、 concrete using portions of beams broken inflexure.2 Normative referencesThe following referenced documents are indispensable for the application ofthis document. For dated references, only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any

22、amendments) applies.BS 8500 (all parts) Concrete Complimentary British Standard to BS EN 206-1.BS EN 206-1, Concrete Part 1: Specification, performance, production andconformityBS EN 12390-4, Testing hardened concrete Part 4: Compressive strength Specification for testing machinesBS EN 12390-5, Test

23、ing hardened concrete Part 5: Flexural strength of testspecimensBS EN 12390-7, Testing hardened concrete Part 7: Density of hardened concrete3 Terms and definitionsFor the purposes of this British Standard the definitions given in BS 8500 (allparts) and BS EN 206-1 apply.4 Apparatus4.1 Compression t

24、esting machine, conforming to BS EN 12390-4.4.2 Auxiliary platens, two square steel auxiliary platens equating to the nominalcross-section dimension of the beams, conforming to BS EN 12390-4, which mayform part of a jig to hold the specimen (see Figure 1), sized such that theposition of the specimen

25、 in the test machine described in 6.1 is achieved.5 Test specimens5.1 GeneralTest specimens shall be broken portions of beams that have been tested inaccordance with BS EN 12390-5.Test specimens shall be free from cracks, chipped surfaces and other obviousdefects within the length to be tested.5.2 D

26、imensionsTest specimens shall have a minimum length of not less than the nominal widthof the beam plus 50 mm.5.3 Mass and densityIf specified, the mass and density of the specimen shall be obtained inaccordance with BS EN 12390-7.BRITISH STANDARD BS 1881-119:2011 BSI 2011 15.4 Storage of specimensDu

27、ring the interval between testing the specimens as beams in accordance withBS EN 12390-5 and testing the portions as cubes, the specimens shall be storedin water at a temperature of (20 2) C and shall be tested immediately onremoval from the water, while still wet.6 Procedure6.1 Placing the specimen

28、 in the machine6.1.1 Wipe the specimen, bearing surfaces of the machine and the auxiliaryplatens to remove any surface water, loose grit or other material.6.1.2 Place the specimen between the auxiliary platens so the load is applied tothe two sides adjacent to the uppermost surface as cast.6.1.3 Cen

29、tre the specimen carefully on the lower platen of the machine so thatit does not touch the jig supports. Align the upper auxiliary platen directly overthe lower platen with at least 25 mm of specimen extending beyond each of thetwo opposite edges.6.1.4 To ensure that the specimen and auxiliary plate

30、ns remain located correctlythroughout the test, mark the position of the upper platen on the specimen oruse a suitable jig similar to that in Figure 1. Do not use any packing betweenthe surfaces of the specimen and the auxiliary platens or between the auxiliaryplatens and the platens of the machine.

31、Figure 1 A typical jig locating specimens for the compression test on beams broken in flexureKey1 Upper auxiliary platen 4 Guide supports belted or welded to bottom plate2 Dowel 5 Lower auxiliary platen3 SpecimenBRITISH STANDARDBS 1881-119:20112 BSI 20116.2 Loading6.2.1 Select a constant rate of loa

32、ding within the range (0.6 0.2) N/mm.s. Afterthe application of the initial load, which does not exceed approximately 30% ofthe failure load, apply the load to the specimen without shock and increasecontinuously at the selected constant rate 10%, until no greater load can besustained.6.2.2 When usin

33、g manually controlled testing machines, correct any tendency forthe selected rate of loading to decrease as specimen failure is approached, byappropriate adjustment of the control.6.2.3 Record the maximum load applied to the specimen and the appearance ofthe concrete and any unusual features in the

34、type of failure.7 Calculation and expression of resultsThe equivalent cube compressive strength of each specimen shall be calculatedby dividing the maximum load by the area of contact of the auxiliary platensand shall be expressed to the nearest 0.1 N/mm2.8 Test reportThe test report shall includea)

35、 identification of the specimen;b) condition of specimen when received (include poor compaction,honeycombing or bad dimensions);c) date of receipt of the specimen;d) type and checked nominal or measured dimensions of the specimen;e) any surface preparation performed when testing the beam in accordan

36、cewith BS EN 12390-5;f) conditions of curing or storage at the laboratory;g) moisture condition at testing (saturated or moist);h) date of test;i) age of the specimen at time of testing;j) mass of the specimen (as-received or saturated), if specified;k) density of the specimen (as-received or satura

37、ted, and the method ofdetermining the volume), if specified;l) maximum load at failure;m) equivalent cube compressive strength;n) appearance of concrete and type of fracture if these are unusual;o) certificate that the test has been carried out in accordance with this BritishStandard;p) copy of test

38、 report on original sample tested in accordance withBS EN 12390-5; andq) other remarks as appropriate.BRITISH STANDARD BS 1881-119:2011 BSI 2011 3BibliographyFor dated references, only the edition cited applies. For undated references, thelatest edition of the referenced document (including any amen

39、dments) applies.BS EN 12350 (all parts), Testing fresh concreteBS EN 12390 (parts 1-3, 6 and 8), Testing hardened concreteBS EN 12504, Testing concrete in structuresBS ISO 5725-2, Accuracy (trueness and precision) of measurement methods andresults Part 2: Basic methods for the determination of repea

40、tability andreproducibility of a standard measurement methodBRITISH STANDARDBS 1881-119:20114 BSI 2011This page deliberately left blankBSI is the independent national body responsible for preparing British Standardsand other standards-related publications, information and services. It presents the U

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