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1、BRITISH STANDARD BS 5838-2: 1980 Specification for Dry packaged cementitious mixes Part 2: Prepacked mortar mixes UDC 691.54:621.798:691.53 Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 This British Standard, having been pre
2、pared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee, was published under the authority of the Executive Board and comes into effect on 29 February 1980 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference CA
3、B/6 Draft for comment 78/10939 DC ISBN 0 580 11148 2 Cooperating organizations The Cement, Gypsum, Aggregates and Quarry Products Standards Committee, under whose direction this British Standard was prepared, consists of representatives from the following Government departments and scientific and in
4、dustrial organizations: Association of Consulting EngineersDepartment of Transport Association of County CouncilsFederation of Civil Engineering Contractors Association of Metropolitan AuthoritiesFederation of Stone Industries* Autoclaved Aerated Concrete Federation Ltd.Gypsum Products Development A
5、ssociation British Precast Concrete Federation Ltd.*Institute of Quarrying British Quarrying and Slag Federation*Institution of Civil Engineers British Railways BoardInstitution of Highway Engineers British Ready Mixed Concrete AssociationInstitution of Municipal Engineers British Steel IndustryInst
6、itution of Public Health Engineers Cement Admixtures Association*Institution of Structural Engineers* Cement and Concrete AssociationInstitution of Water Engineers and Scientists Cement Makers Federation*National Federation of Building Trades Chemical Industries AssociationEmployers* Concrete Societ
7、y LimitedNatural Environment Research Council Department of the Environment (Building(Institute of Geological Science) Research Establishment)Royal Institute of British Architects* Department of the Environment (Housing andRoyal Institution of Chartered Surveyors Construction)Sand and Ballast Haulie
8、rs and Allied Department of the Environment (PSA)*Trades Alliance Department of the Environment (TransportSand and Gravel Association Limited* and Road Research Laboratory)Society of Chemical Industry* The organizations marked with an asterisk in the above list, together with the following, were dir
9、ectly represented on the committee entrusted with the preparation of this British Standard: Brick Development AssociationCounty Surveyors Society British Ceramic Research AssociationElectricity Supply Industry in England and British Civil Engineering Test EquipmentWales Manufacturers AssociationMort
10、ar Producers Association Ltd. Calcium Silicate Brick Association LimitedNational Federation of Plastering Contractors Cementitious Packaged Products AssociationPlasterers Craft Guild Concrete Block AssociationCo-opted member Amendments issued since publication Amd. No.Date of issueComments Licensed
11、Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 BSI 10-1999i Contents Page Cooperating organizationsInside front cover Forewordii 1Scope1 2References1 3Definitions1 4Constituent materials1 5Preparation of aggregates1 6Types and propert
12、ies of mortar mixes1 7Packaging1 8Sampling1 9Testing2 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 ii BSI 10-1999 Foreword This British Standard has been produced under the directio
13、n of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee. It covers factory produced dry mixes of cement, aggregates and, when used, admixtures which are supplied in packages for the do-it-yourself and retail trades. It is intended that the contents of these packages should be mix
14、ed on site with the only addition being water. Part 1 of the standard covers prepacked concrete mixes of two grades; coarse concrete mixes containing aggregate of a nominal maximum size of 20 mm, and fine concrete mixes containing aggregate of a nominal maximum size of 10 mm. Part 2 of the standard
15、covers prepacked cement : lime : sand mortar mixes and cement : sand mortar mixes for bricklaying, screeding and other building purposes. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct applicatio
16、n. Compliance with a British Standard does not of itself confer immunity from 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) an
17、d may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 BSI 10-19991 1 Scope This Part of BS 5838 specifies, for the do-i
18、t-yourself and retail trades, the materials to be used, the methods of describing the grades of mortar, the physical requirements of packaging materials, identification of contents and sampling and testing to determine compliance with this standard. 2 References The titles of the publications referr
19、ed to in this Part of this standard are listed on the inside back cover. 3 Definitions For the purposes of this Part of BS 5838 the following definitions apply. prepacked mortar mixes a prepacked mixture consisting substantially of cement and fine aggregate or cement, lime and fine aggregate requiri
20、ng only mixing with water before use volume yield the volume of a wet mix of workable consistence obtained from a unit mass of dry material 4 Constituent materials 4.1 Cement. The cement shall be ordinary or rapid-hardening Portland cement complying with the requirements of BS 12, Portland blastfurn
21、ace cement complying with the requirements of BS 146, or masonry cement complying with the requirements of BS 5224. 4.2 Lime. Lime shall comply with the requirements of BS 890. 4.3 Aggregates. Aggregates shall comply with the requirements of BS 882, BS 1201, BS 1198, BS 1199 and BS 1200 or BS 3797,
22、as appropriate. 4.4 Admixtures. When admixtures are used they shall comply with the requirements of BS 4887. 4.5 Chloride. The chloride ion content of the constituents shall be not greater than 0.05 % of the mass of the contents of the package. 5 Preparation of aggregates All aggregates, before mixi
23、ng with the other constituents, shall have a moisture content of less than 0.5 % by mass when tested in accordance with the requirements of 7.3 of BS 812-2:1975. 6 Types and properties of mortar mixes 6.1 Aggregate sizes. The mortar shall contain aggregates as described in 4.3 with a maximum size of
24、 5 mm and shall be described as “bricklaying and masonry mortar” or “sand and cement mortar”. 6.2 Compressive strength. The compressive strength at 28 days shall be determined as detailed in clause 9 and shall be not less than 3 N/mm2 for bricklaying and masonry mortar and not less than 6 N/mm2 for
25、sand and cement mortar. 6.3 Volume yield. The volume yield shall be determined as detailed in clause 9 and reported as the volume of mortar in m3 per unit package. 7 Packaging 7.1 Identification and marking. Identification and marking of packages shall include the following particulars. a) The numbe
26、r of this British Standard, i.e. 5838-2. b) Product description. c) Mass and nominal volume yield. d) Description of any admixture. e) Indication of health and safety requirements. f) Advice on storage. g) The name, trade mark or other means of identification of the manufacturer or vendor. h) Advice
27、 on use and mixing. 7.2 Package construction. The strength of the package shall be adequate to contain the mass of dry mortar mix for which it is intended. The material from which the packages are made shall have water vapour transmission not greater than 20 g/m2 in 24 h as determined in accordance
28、with the requirements of BS 3177. This requirement shall not apply to packages of less than 5 kg. 8 Sampling When testing is called for, a combination of whole packages, having a total mass of not less than 50 kg for every 10 tonne of package supplied, shall be submitted for testing in accordance wi
29、th the requirements of clause 9. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 2 BSI 10-1999 9 Testing 9.1 General. All sampling, curing and testing of the fresh or hardened mortar shall be carried out in accordance with the
30、 requirements of BS 4551. 9.2 Preparation of sample. The sample, when received in the laboratory, shall be rendered homogeneous and reduced in size by coning and quartering, or by any other suitable sampling means, to 5 kg to 10 kg. 9.3 Mixing of mortar. The weighed, prepared sample (9.2) shall be m
31、achine mixed using the procedure described in BS 4551 with the amount of water required to give the consistence specified in 9.4. 9.4 Consistence and water requirement. The consistence of the mortar shall be measured by the dropping ball test in accordance with the requirements of BS 4551 and shall
32、be between 9.5 mm and 10.5 mm. If the consistence is less than 9.5 mm then further water may be added and mixed in to reach the required consistence. If the consistence is more than 10.5 mm the test shall be repeated with a new prepared sample as specified in 9.2, using less water. The amount of wat
33、er to achieve the required consistence shall be recorded as the water requirement and expressed as a percentage by mass of solid ingredients to the nearest 0.1 %. 9.5 Volume yield. Immediately after completion of the dropping ball test, the wet bulk density of the fresh mortar shall be determined to
34、 the nearest 1 kg/m3 as specified for “air content of freshly-mixed mortars” in BS 4551. The volume yield per unit package shall then be calculated to the nearest 0.0001 m3 from the formula: 9.6 Making and curing of cubes. The same mortar shall be used as specified in 9.4. The size of test cubes sha
35、ll be 100 mm and they shall be made and cured under limewater in accordance with BS 4551. Three cubes shall be retained from each batch for test at 28 days age. 9.7 Testing of cubes. The cubes shall be tested for compressive strength in accordance with the requirements of BS 4551 and the average of
36、the three cubes taken from the same batch and reported to the nearest 0.1 N/mm2 shall be the test result. where V is the volume yield per unit package (m3). W is the mass of unit package (kg) R is the water requirement as determined in 9.4 (%) D is the wet bulk density (kg/m3) V R0.01W()W+ D - -= Li
37、censed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2:1980 BSI 10-1999 Publications referred to BS 12, Specification for ordinary and rapid-hardening Portland cement. BS 146, Portland blastfurnace cement. BS 812, Methods for sampling and t
38、esting of mineral aggregates, sands and fillers. BS 812-2, Physical properties. BS 882, BS 1201, Aggregates from natural sources for concrete (including granolithic). BS 890, Building limes. BS 1198, BS 1199 and BS 1200, Building sands from natural sources. BS 3177, Method for determining the permea
39、bility to water vapour of flexible sheet materials used for packaging. BS 3797, Specification for lightweight aggregates for concrete. BS 4551, Methods for testing mortars and specification for mortar testing sand. BS 4887, Mortar plasticizers. BS 5224, Specification for masonry cement. Licensed Cop
40、y: sheffieldun sheffieldun, na, Mon Dec 04 16:17:49 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 5838-2: 1980 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on stand
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