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1、BRITISH STANDARD BS 1881-110: 1983 Reprinted, incorporating Amendment No. 1 Testing concrete Part 110: Method for making test cylinders from fresh concrete UDC 666.972.017:691.32:620.1 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1881-
2、110:1983 This British Standard, having been prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee, was published under the authority of the Board of BSI and comes into effect on 29 July 1983 BSI 12-1998 The following BSI references relate to the work
3、on this standard: Committee reference CAB/4 Draft for comment 81/12319 DC ISBN 0 580 13331 1 Committees responsible for this British Standard This British Standard was published under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee CAB/-. Its preparation was e
4、ntrusted to Technical Committee CAB/4 upon which the following bodies were represented: British Aggregate Construction Materials Industries British Precast Concrete Federation Ltd. British Ready Mixed Concrete Association Cement Admixtures Association Cement and Concrete Association Cement Makers Fe
5、deration Concrete 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 Electricity Supply Industry in England and Wal
6、es Federation of Civil Engineering Contractors Greater London Council Institute of Concrete Technology Institution of Civil Engineers Institution of Highway Engineers Institution of Municipal Engineers Institution of Structural Engineers Institution of Water Engineers and Scientists National Federat
7、ion of Building Trades Employers Royal Institute of British Architects Royal Institution of Chartered Surveyors Sand and Gravel Association Limited Society of Chemical Industry The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Civil
8、 Engineering Test Equipment Manufacturers Association Coopted members Amendments issued since publication Amd. No.Date of issueComments 6103July 1989Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 188
9、1-110:1983 BSI 12-1998i Contents Page Committees responsible Inside front cover Foreword ii 1Scope 1 2 Definitions 1 3 Apparatus 1 4 Sampling 2 5 Preparing the sample 2 6 Procedure 3 7 Preparation of upper surface of cylinder 3 8 Conditioning of prepared cylinder 4 9 Report 4 Publications referred t
10、oInside back cover Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1881-110:1983 ii BSI 12-1998 Foreword This Part of this British Standard, prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Comm
11、ittee, is a revision of 5.1, 5.2, 5.3, 5.4, 5.5, 5.7, 5.8 and 5.9 of BS 1881-3:1970. Together with Parts 108, 109, 111, 112 and 113, this Part of BS 1881 supersedes BS 1881-3:1970, which is withdrawn. The dimensions and tolerances specified in this Part of this standard comply with ISO 1920. A Briti
12、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
13、 cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffi
14、eldun, na, Fri Nov 24 08:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1881-110:1983 BSI 12-19981 1 Scope This Part of this British Standard describes a method for making test cylinders of nominal diameter 100 mm and 150 mm out of fresh concrete. The method applies to plain and air-entrained c
15、oncrete made with lightweight, normal weight and heavy aggregates having a nominal maximum size not exceeding 20 mm for 100 mm cylinders and 40 mm for 150 mm cylinders. NOTE 1A cylinder produced for determining tensile splitting strength should preferably be of 150 mm diameter with a length of 150 m
16、m. A cylinder produced for determining the static modulus of elasticity should preferably be of 150 mm diameter with a length of 300 mm. See BS 1881-117 and BS 1881-121. This method does not apply to aerated concrete, very stiff concrete, which cannot be compacted by vibration alone, and no-fines co
17、ncrete. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this Part of this British Standard the definitions given in BS 5328 and BS 1881-101 apply. 3 Apparatus 3.1 Mould 3.1.1 Construction and assembly. The mould
18、 shall comprise a cylindrical former and a base plate both of ferrous metal having a hardness value of at least 90 Rockwell (scale B) when determined in accordance with BS 891. The cylindrical former shall be capable of being split longitudinally to facilitate removal of the concrete cylinder. All p
19、arts of the mould shall be robust enough to prevent distortion. Before assembly for use, the joints between the two sections of the cylindrical former and between them and the base plate shall be thinly coated with oil or grease to prevent loss of water. When the mould is assembled, the sections of
20、the cylindrical former shall be positively located and the whole assembly rigidly held together in such a manner as to prevent leakage from the mould. The internal faces of the assembled mould shall be thinly coated with release agent to prevent adhesion of the concrete. The sections of the cylindri
21、cal former shall be clearly marked before use with a reference code to enable each mould to be correctly assembled and, where appropriate, the cylinder to be marked for identification. 3.1.2 Tolerances on dimensional deviations of new or refurbished moulds. A new or refurbished mould shall be accura
22、te within the following limits. a) Dimensions. The internal diameter of the mould when assembled, based on the mean of three pairs of measurements at right angles to each other, symmetrically placed along the length of the mould, shall be 100 0.15 mm or 150 0.15 mm. The length, based on the mean of
23、four symmetrically placed measurements, shall be the nominal size 0.5 mm. b) Flatness. Excluding any indentations resulting from the hardness test, the flatness tolerance (see BS 308-3) for the top surface of the base plate shall be 0.03 mm wide. The flatness tolerance for the top and bottom surface
24、s of the cylindrical former, when assembled, shall be 0.06 mm wide and for the longitudinal joint faces shall be 0.06 mm per 150 mm length and 0.15 mm for each entire surface. NOTEThe flatness of the top surface of the base plate and of the longitudinal joint faces can be checked by using a straight
25、edge complying with grade A of BS 5204-2 and feeler gauges complying with BS 957. c) Squareness. When assembled, the squareness tolerance (squareness 3 of BS 308-3) for the axis of the mould with respect to the top surface of the base plate as datum face shall be a cylinder of diameter 1.0 mm perpen
26、dicular to the datum face. d) Parallelism. When assembled, the parallelism tolerance (parallelism 4 of BS 308-3) for the top surface of the mould with respect to the top surface of the base plate as datum face shall be 1.0 mm wide. e) Cylindricity. The cylindricity tolerance (see BS 308-3) for the i
27、nner cylindrical surface shall be 0.5 mm. 3.1.3 Tolerances on dimensions and flatness of moulds in use. A mould shall be refurbished or discarded when any dimensional deviation given in 3.1.2 exceeds twice the tolerance specified for a new mould. NOTECompliance with the tolerances for dimensions and
28、 flatness applicable to moulds in use should be checked at least once a year and when there is any cause to suspect that the dimensions of the mould may not be within the specified limits. The flatness over the top surface of the base plate can be checked using either: a) a straightedge complying wi
29、th grade A of BS 5204-2 and feeler gauges complying with BS 957, or b) an assembly comprising two fixed reference points and a central movable reference point, all three of which can be placed in contact with the surface. The central reference point should be linked to a calibrated dial gauge, compl
30、ying with BS 907, which indicates the distance of the third point from the line joining the two fixed reference points. Checks should be made in several directions to ensure that the flatness is within the required tolerance in any direction. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08
31、:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1881-110:1983 2 BSI 12-1998 If the dial gauge assembly is used, suitable spacings between the fixed reference points are 80 mm and 120 mm for 100 mm and 150 mm diameter moulds respectively. In such cases, the flatness requirement of 0.06 mm for th
32、e top surface of the base plate is equivalent to a deviation of the movable reference point from the straight line joining the two fixed reference points of 0.04 mm. The corresponding value when checking the flatness of the joint faces, or the top surface of the base plate with a dial gauge assembly
33、 is 0.08 mm. 3.1.4 Surface texture of the base plate. The surface texture of the top surface of the base plate shall not exceed 3.2 m Ra when determined in accordance with with BS 1134. NOTEThe top surface of the base plate of a mould usually becomes smoother with use but the surface should be check
34、ed annually and at any time that it appears to have been roughened or damaged. “(Accurate examples of different surface textures complying with BS 2634-1 permit tactile estimation of the surface texture.)” 3.2 Scoop, approximately 100 mm wide. 3.3 Compacting bar or vibrator. Compacting bar made from
35、 iron or steel weighing 1.8 0.1 kg, at least 380 mm long and having a ramming face 25.0 0.5 mm square, or a vibrating hammer or table suitable for compacting the concrete in accordance with 6.2 or 6.3. 3.4 Plasterers steel float. 3.5 Sampling tray, minimum dimensions 900 mm 900 mm 50 mm deep of rigi
36、d construction and made from a non-absorbent material not readily attacked by cement paste. 3.6 Square mouthed shovel, size 2 in accordance with BS 3388. 3.7 Glass capping plate (required if capping in accordance 3.8 Top plate (required if capping in accordance with 7.1.3.3), at least 8 mm thick, wh
37、ich can be clamped to one end of the mould. The surface clamped to the mould shall comply with the tolerances specified in 3.1.2 b) and f) and shall have a Rockwell (scale B) Hardness Value1) of at least 95 when tested in accordance with BS 891-1. 3.9 Grinding equipment (required if grinding in acco
38、rdance with 7.1.3.4), capable of producing a surface in accordance with the tolerance specified in 7.2. 3.10 Steel collar (required if capping in accordance with 7.1.3.5), with a machined edge suitable for use when capping in accordance with 7.1.3.5. 3.11 Steel plate (required if capping in accordan
39、ce with 7.1.3.6), with the working surface complying with the tolerances specified in 3.1.2b) and f) and with a Rockwell (scale B) Hardness Value1) of at least 95 when tested in accordance with BS 891-1. 4 Sampling Obtain the sample of fresh concrete by the procedure given in Part 101 or Part 125 of
40、 this British Standard. Commence making the cylinder as soon as possible after sampling. 5 Preparing the sample Empty the sample from the container(s) on to the sampling tray. Ensure that no more than a light covering of slurry is left adhering to the container(s). Thoroughly mix the sample by shove
41、lling it to form a cone on the sampling tray and turning this over with the shovel to form a new cone, the operation being carried out three times. When forming the cones deposit each shovelful of the material on the apex of the cone so that the portions which slide down the sides are distributed as
42、 evenly as possible and so that the centre of the cone is not displaced. Flatten the third cone by repeated vertical insertion of the shovel across the apex of the cone, lifting the shovel clear of the concrete after each insertion. NOTEThe following modifications to the mixing procedures may be nec
43、essary when preparing samples of very high workability concrete (e.g. superplasticized concrete) for test. a) Sampling tray. The vertical lips on the edges of the tray may have to be larger to contain the sample without spillage during mixing. b) Mixing the sample. The coning procedure is not suitab
44、le for very high workability concrete and the following alternative method of mixing is recommended. Having poured the concrete on to the sampling tray, use the shovel to turn the concrete from the outside toward the centre, working progressively once round all sides of the sampling tray. CAUTION. W
45、hen cement is mixed with water, alkali is released. Take precautions to avoid dry cement entering the eyes, mouth and nose when mixing concrete. Prevent skin contact with wet cement or concrete by wearing suitable protective clothing. If cement or concrete enters the eye, immediately wash it out tho
46、roughly with clean water and seek medical treatment without delay. Wash wet concrete off the skin immediately. 1) Indentations on the face resulting from the hardness test are acceptable. Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 08:24:40 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 18
47、81-110:1983 BSI 12-19983 6 Procedure 6.1 Filling the mould. Place the mould on a rigid horizontal surface or on the vibrating table and fill with concrete in such a way as to remove as much entrapped air as possible (without significantly reducing the amount of entrained air, if present) and to prod
48、uce full compaction of the concrete with neither excessive segregation nor laitance. For this purpose, by means of the scoop place the concrete in the mould in layers approximately 50 mm deep and compact each layer by using either the compacting bar or the vibrator in the manner described in 6.2 or
49、6.3. After the top layer has been compacted, smooth it level with the top of the mould, using the plasterers float, and wipe clean the outside of the mould. 6.2 Compacting with compacting bar. When compacting each layer with the compacting bar distribute the strokes of the compacting bar in a uniform manner over the cross-section of the mould, and ensure that the compacting bar does not penetrate significantly any previous layer nor forcibly strike the bottom of the mould when compacting the first layer. The number of strokes per layer required to produce full