BS 1881_PART 108_1983

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BRITISH STANDARD T e st in g c o nc r e te Part 108. Method for making test cubes f r om fresh c o ncr e te * ) * NO COI'YIN(; WITHOUT IISI I'EI(MISSION EXCEI'T AS I'EI(MITTEIJ BY COI'YI(IGIrl L\ w ',:,:~_:~_,-: ~_;_ . _.~_ •. :.. . _:... _ .:;:. ;;'-::':'J,~._"":'_'~:'_'J. .~'.-" __ _._. ._J BS 1881 : Part 108 : 1983 Incorporaiinq Amendment, No. '1 and implementing Amendment. No.2 not pub lish ed sep ara tely .,-..;."_ _.,;. ._ ~_:_:~~ _.. "_ I

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    BRITISH STANDARD

    Testing concretePart 108. Method for making test cubesfrom fresh concrete

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    BS 1881 :Part 108 : 1983IncorporaiinqAmendment, No. '1andimplementingAmendment. No.2 notpublished separately

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    Issue 2, May 1996 BS 1881 Part 108 : 1983

    ForewordThis Part of this British Standard, prepared under thedirection of the Cement, Gypsum, Aggregates and QuarryProducts Standards Committee. is a revision of 2.1, 2.2,23,2.4,2.7 and 2.8 of BS 1881 : Part 3: 1970.Together with Parts 109, 110, 111, 112 and 113, this Partat BS 1881 supersedes BS 1881 : Part 3: 1970, which iswithdrawn.The dimensions and tolerances specified in this Part of thisstandard comply with ISO 1920.Compliance with a British Standard does not of itself conferimmunity from legal obligations.

    1. StopeThis Part of this British Standard describes a method formaking test cubes of nominal sizes 100 mm and 150 mmout of fresh concrete. The method applies to plain andair-entrained concrete made with l ightweight, normal weightand heavy aggregates having a nominal maximum size notexceeding20 mm for 100mm cubes and 40 mm for150 mm cubes.This method does not apply to aerated concrete, very stiffconcrete, which cannot be compacted by vibration alone,and no-fines concrete.NOTE. The titles of the publications referred to in this standardare listed on the inside back page.2. DefinitionsFor the purposes of this Part of this British Standard,the definitions given in 85 5328 and BS 1881 : Part 101apply.

    3. Apparatus3.1 Mould3.1.1 Construction and assembly. The sides at the mouldshall be rnanut actured from ferrous metal having a hardnessvalue of at least 175 Brinell (300 kg 10 mm ball) whendetermined in accordance with BS 240 : Part 1. The mouldshall include a removable ferrous metal base plate. All partsof the mould shall be robust enough to prevent distortion.Before assembly for use, the joints between the sides of themould and between the sides and the base plate shall bethinly coated with oil or grease to prevent loss of water. Thesides of the mould when assembled shall be positivelylocated and the whole assembly rigidly held together insuch a manner as to prevent leakage from the mould. Theinternal faces of the assembled mould shall be thinly coatedwith release agent to prevent adhesion of the concrete.The sides of the mould shall be clearly marked before usewith a reference code to enable each mould to be correctlyassembled and, where appropriate, the cube to be markedfor identification.3.1.2 Toleranceson dimensional deviations of new orrefurbished moulds. A new or refurbished mould shall beaccurate within the following l imits.

    (a) Dimensions. The internal depth of the mould whenassembled and the distance between the two pairs ofopposite internal side faces, each based on the mean oftour symmetrically arranged measurements, shall beeither 100 = 0.15 mm or 150: 0.15 mm.(b) Flatness. Excluding any indentations resulting from thehardness test, the flatness tolerance (see BS 308 : Part 3)for each internal side face when assembled shall be0.03 mm wide for 100 mm moulds and 0.045 mm for150 ~nim()ulds~Theflatness tolerance for the joint faces,for the top and bottom surfaces of the assembled mouldsides and the top surface of the base plate shall be0.06 mm wide.NOTE 1.As a guide to manufacturers, the tolerance aftermanufacture should be 0.03 mmwide for each internal side facewhen assembled. Achieving this tolerance will allow for anymovement of the cast iron after machining.NOTE 2. The flatness tolerances cha be checked using a straight-edge complying with grade A of BS 5204 : Part 2 and feelergauges complying with BS 957.

    The purchaser should note the need to &CC1!pt the indentations On the face, 01 new mould, re sut unq from tile hardness test.1 The base plate of a 150 mm mould should preferably have a thickness of at least 15 mm.~ This tolerance should be considered in conjunction with tnose for flatness. soo ar e ne s s and parallel,sm.

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    BS 1881 Part 108 1983Issue 2, May 1996

    (c) Soo areness. When assembled. the squarenesstoter ances (squar ene ss 4 of BS 308 : Part 3) for eachinternal side face Nith respect to the adjacent internalside fa ce s and tor of the base plate as datum facesshall be 0.5 mm wide.(d) Parallelism. When assembled, the parallelismtolerance (parallelism 4 of BS 308: Part 3) for thetop surface of the mould with respect to the topsurf ace of the base plate as datum face shall be1.00 mm wide.

    3.1.3 Tolerances on dimensions and flatness cf moulds inuse. Excluding flatness a mould shall be refurbished ordiscarded when any dimensional deviation given in 3.1.2exceeds twice the tolerance specified for a new mould.A mould shall be refurbished or discarded when theflatness tolerance exceeds 0.06 mm wide or when theflatness tolerance for the joint faces, the top and bottomfaces of the assembled sides or the top surface of the baseplate exceeds 0.12 mm wide.NOTE. Cornotiance with the tolerances on dimensions and flatnessC'llicable to moulds in use should be checked lit least once a year' > . b wh~n there is any cause to suspect that the dimensions of themould may not be within the specified limiu.The flatness of the side faces and the top surface of the base platecan be checked by using either:

    (al a straightedge complying with as 5204 : Part 2. grade Aand teeter gauges complying with as 957; Of"(bl an assembly comprising two fixed reference points and acentral movable reference point, atl three of which can beplaced in contact with the surface. The central referencepoint should be linked to a calibrated dial gauge, complyingwith as 907. which indicates the distance of the third pointfrom the line joining the two fixed reference po inn.Checks should be made on the joint faces of individual partsand in several directions on the sides of assembled moulds and on the base plate to ensure that the flatness iswithin therequired tolerance in any direction,If the dial gauge assembly is used, suitable spacings betweenthe fixed reference poinu are 80 mm and 120 mm for 100 mmand 150mm moulds respectivel,(:ln such cases, the flatnessrequirements of 0.06 mm for the internal side faces of mouldsin use is equivalent to a deviation of the movable referencepoint from the straight line jOining the two fixed reference

    C'''?OinU of 0.04 rnrn,,.. The corresponding value when checking the flatness of thejoint fac~s or of the top surface of the base plate with a dialgauge assembly is 0.08 mm.

    3.1.4 Surface texture of internal side faces. The surfacetexture of each internal side face shall not exceed 3.2 prnR. when determined in accordance with BS 1134.NOTE. The internal faces of moulds usually become smo orher withuse but the surfaces should be checked annually and at any timethat the internal surfaces appear to have been rouqbened ordamaged. (Accurate examples of different surface texturescomplying with as 2634 : Part 1permit tactile estimationof the surface texture.'3:2 Scoop, approximately 100 rnrn wide.3.3 Compacting bar or vibrator. Compacting bar made,from iron or steel weighing 1.8 : : ! : 0.1 kg. at least 380 rnrnlong and havinq a ramming face 25.0 0.5 mm square,or a vibrating hammer or table suitable for compactingthe concrete in accordance with 6.2 or 6.3.3.4 Plssterer's steel tloet.3.5 Sampling trey , minimum dimensions 900 mrn x900 mm x 50 mm deep of rigid construction and madefrom a nori absorbent material not re adiIv attacl

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    subjected to less than 35 strokes per layer for 150 mmcubes or 25 strokes per layer for 100 mm cubes, except inthe case of very high workability concrete. Record thenumber of strokes.6.3 Compacting with vibrator. When compacting eachlayer by means of the hammer or vibrating table use appliedvibration of the minimum duration necessary to achievefull compaction of the concrete. Over-vibration may causeexcessive segregation and laitance or loss of entrained air,if present. The required duration of vibration will dependupon the workability of the concrete and the effectivenessof the vibrator and vibration shall cease as soon as thesurface of the concrete becomes relatively smooth and hasa glazed appearance. Record the duration of vibration.7. Report7.1 General. The report shall affirm that the cubes weremade in accordance with this Part of this British Standard.The report shall state whether or not a certificate ofsampling is available. If available, a copy of the certificateshall be provided.7.2 Information to be included in the test report7.2.1 Mandatory information. The following informationshall be included in the test report:

    (a) date, time and place of sampling and sampleidentity number;

    (b) time and place of making cubes;(e) number and nominal size of cubes;(d) method of compaction (hand or vibration) includingtype of equipment used and the number of strokes ofthe compacting bar or duration of the vibration;[e] identification nurrber or codes of cubes;(f) name of person making cubes;(g) certificate that the cubes were made in accordancewith this Part of this standard.

    7.2.2 Optional information. If requested the followinginformation shall be included in the test report:

    (a) name of project and place where concrete used;(b) name of supplier and source of concrete;(c) date and time of production of concrete or deliveryto site;(d) specification of concrete mix (e.g. strength grade);(e) workability of concrete;(f) air content of concrete (if air-entrained);(g) age(s} at which cubes are to be tested.

    Publications referred toEngineering drawing practicePart 3 Geometrical tolerancingMethods for hardness test (Rockwell method) and for vertification of hardness testingmachines (Rockwell method)Specification for dial gauges for linear measurementSpecification for feeler gaugesMethod for the assessment of surface textureTesting concretePart 101 Method of sampling fresh concrete on sitePart 109' Method for making test beams from fresh concretePart 110' Method for making test cylinders form fresh concretePart 111 Method of normal curing of test specimens (20 C method)Part 112' Methods of accelerated curing of test cubesPart 113' Method for making and curing no-fines test cubesPart 125 Methods for mixing and sampling fresh concrete in the laboratorySpecification for roughness comparison specimensPart 1 Specification for turned. ground. bored. milled. shaped and planed specimens

    as 3388 Forks, shovels and spadesas 5204 Specification for straightedges

    Part 2 Steel or granite staightedges of rectangular sectionas 5328 Methods for specifying concrete. including ready-mixed concreteISO 1920" Concrete tests - Dimensions. tolerance and applicabilitY of test specimens

    BS 3088S 891BS 907BS 957BS '134BS 1881

    BS 2634

    Referred to in the foreword only.

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    BS 1881 Part 108: 1983Issue 2, May 1996Th" Bflt'Sh Srao oa-o hav,ng been prep~red under the direction ofIhe Cerne o t , Gypsum. Agg'e