bs 1881-119 conrete method for determination of compressiv

5/24/2018 BS 1881-119 CONRETE Method for Determination of Compressiv

BRITISH STANDARD BS 1881-119:1983

Testing concrete Part 119: Method for determination ofcompressive strength using portions ofbeams broken in flexure (equivalentcube method)

UDC 666.972.017:691.32:620.1


BS 1881-119:1983

This British Standard, havingbeen prepared under thedirection of the Cement,Gypsum, Aggregates andQuarry Products StandardsCommittee, was publishedunder the authority of theBoard of BSI and comes intoeffect on31 January 1983

BSI 12-1998

The following BSI referencesrelate to the work on thisstandard:Committee reference CAB/4Draft for comment 80/14205 DC

ISBN 0 580 12956 X

Cooperating organizations

The Cement, Gypsum, Aggregates and Quarry Products StandardsCommittee, under whose direction this British Standard was prepared,consists of representatives from the following:

Association of Consulting EngineersAssociation of County CouncilsAssociation of District CouncilsAssociation of Metropolitan AuthoritiesAutoclaved Aerated Concrete Products AssociationBritish Precast Concrete Federation Ltd.*British Quarrying and Slag Federation*British Railways BoardBritish Ready Mixed Concrete Association*British Steel IndustryCement Admixtures AssociationCement and Concrete Association*Cement Makers Federation*Chemical Industries AssociationConcrete Society Limited*

County Surveyors Society*Department of the Environment (Building Research Establishment)*Department of the Environment (PSA)*Department of the Environment (Transport and Road Research Laboratory)*Department of Transport*Federation of Civil Engineering Contractors*Gypsum Products Development AssociationInstitute of QuarryingInstitution of Civil Engineers*Institution of Highway Engineers*Institution of Municipal Engineers*Institution of Public Health EngineersInstitution of Structural Engineers*Institution of Water Engineers and Scientists*National Federation of Building Trades Employers*Natural Environment Research Council (Institute of Geological Science)Royal Institute of British Architects*Royal Institution of Chartered Surveyors*Sand and Ballast Hauliers and Allied Trades AllianceSand and Gravel Association Limited*Society of Chemical Industry*Stone Federation

The organizations marked with an asterisk in the above list, together with thefollowing, were directly represented on the Technical Committee entrustedwith the preparation of this British Standard:

British Civil Engineering Test Equipment Manufacturers AssociationElectricity Supply Industry in England and WalesGreater London CouncilInstitute of Concrete Technology

Coopted member

Amendments issued since publication

Amd. No. Date of issue Comments


BS 1881-119:1983

BSI 12-1998 i

Contents

Page

Cooperating organizations Inside front cover

Foreword ii1 Scope 1

2 Definitions 1

3 Apparatus 1

4 Test specimens 1

5 Procedure 1

6 Calculation and expression of results 1

7 Test report 2

Figure 1 A typical jig locating specimens for the compressiontest on beams broken in flexure 2

Publications referred to Inside back cover


BS 1881-119:1983

ii BSI 12-1998

Foreword

This Part of this standard, prepared under the direction of the Cement, Gypsum,Aggregates and Quarry Products Standards Committee, is a revision of clause 6

of BS 1881-4:1970. Together with Parts 115, 116, 117, 118 and 120, this Part ofBS 1881 supersedes BS 1881-4:1970, which is withdrawn.

In 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 jig 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 5497-1 for further information on thedetermination of repeatability and reproducibility.

A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii,pages 1 and 2, an inside back cover and a back cover.

This standard has been updated (see copyright date) and may have hadamendments incorporated. This will be indicated in the amendment table onthe inside front cover.


BS 1881-119:1983

BSI 12-1998 1

1 Scope

This Part of this British Standard describes theequivalent cube method for determining thecompressive strength of hardened concrete usingportions of beams broken in flexure.

NOTE The titles of the publications referred to in this Part ofthis standard are listed on the inside back cover.

2 Definitions

For the purposes of this Part of this BritishStandard the definitions given in BS 5328 apply.

3 Apparatus

3.1 Compression testing machine.The testing

machine shall comply with BS 1881-115.

3.2Auxiliary platens.Two square steel auxiliaryplatens equating to the nominal cross-sectiondimension of the beams, complying withBS 1881-115 shall be provided, which may form partof a jig to hold the specimen (see Figure 1).

4 Test specimens

4.1 General.Test specimens shall be the brokenportions of the beams that have been tested inaccordance with BS 1881-118.

Test specimens shall be free from cracks, chippedsurfaces and other obvious defects within the lengthto be tested.

4.2 Dimensions.Test specimens shall have aminimum length of not less than the nominal widthof the beam plus 50 mm.

4.3 Storage of specimens.During the intervalbetween testing the specimens as beams inaccordance with BS 1881-118 and testing theportions as cubes, the specimens shall be stored inwater at a temperature of 20 2 C and shall betested immediately on removal from the water,whilst still wet.

5 Procedure

5.1 Placing the specimen in the machine.Wipeclean the bearing surfaces of the machine and theauxiliary platens and remove any surface water orloose grit or other material from the surfaces of thespecimens that are to be in contact with theauxiliary platens. Place the specimen between theauxiliary platens in such a manner that the load isapplied to the two sides adjacent to the uppermostsurface as cast. The upper auxiliary platen shall bedirectly over the lower platen in such a manner thatthe specimen extends at least 25 mm from each ofthe two opposite edges. Carefully mark thespecimen or preferably use a suitable jig such asthat shown in Figure 1 to ensure that the specimenand auxiliary platens are located correctly. Centrethe specimen carefully on the lower platen of themachine so that it does not touch the jig supports.

Do not use any packing between the surfaces of thespecimen and the auxiliary platens or between theauxiliary platens and the platens of the machine.

5.2 Loading.Without shock, apply and increase theload continuously at a rate within therange 0.2 N/(mm2s) to 0.4 N/(mm2s) until nogreater load can be sustained. On manuallycontrolled machines as failure is approached theloading will decrease; at this stage operate the

controls rapidly to maintain as far as possible thespecified load. Record the maximum load applied tothe specimen and note the appearance of theconcrete and any unusual features in the type offailure.

6 Calculation and expression of results

The equivalent cube compressive strength of eachspecimen shall be calculated by dividing themaximum load by the area of contact of theauxiliary platens and shall be expressed to thenearest 0.5 N/mm2.


BS 1881-119:1983

2 BSI 12-1998

7 Test report

7.1 General.The report shall affirm that the testswere carried out in accordance with this Part of thisstandard. The report shall also state whether or notcertificates of sampling, specimen preparation andcuring are available. If available, a copy of eachcertificate shall be provided.

7.2 Information to be provided by theproducer of the test specimens.The informationto be provided by the producer of the test specimensshall be as given in 7.2of BS 1881-118.

7.3 Information to be provided by the testlaboratory.The following information shall beprovided by the test laboratory for inclusion in the

test report:

a) identification of the specimen;

b) condition of specimen when received (includepoor compaction, honeycombing or baddimensions);

c) date of receipt of the specimen;

d) type and checked nominal or measureddimensions of the specimen;

e) any surface preparation;

f) conditions of curing or storage at the

laboratory;g) moisture condition at testing (saturated ormoist);

h) date of test;

i) age of the specimen at time of testing;

j) mass of the specimen (as-received orsaturated);

k) density of the specimen (as-received orsaturated, and the method of determining thevolume);

l) maximum load at failure;

m) equivalent cube compressive strength;n) appearance of concrete and type of fracture ifthese are unusual;

o) certificate that the test has been carried out inaccordance with this Part of this standard;

p) other remarks.

Figure 1 A typical jig locating specimens for the compression test on beamsbroken in flexure


BS 1881-119:1983

BSI 12-1998

Publications referred to

BS 1881, Testing concrete.

BS 1881-115, Specification for compression testing machines for concrete.

BS 1881-118, Method for determination of flexural strength.BS 5328, Methods for specifying concrete, including ready-mixed concrete.

BS 5497,Precision of test methods1).

BS 5497-1, Guide for the determination of repeatability and reproducibility for a standard test method.

1) Referred to in the foreword only.


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bs 1881-119 conrete method for determination of compressiv

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