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1、BRITISH STANDARD BS 4887-1: 1986 Mortar admixtures Part 1: Specification for air-entraining (plasticizing) admixtures UDC 666.971.16 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 This British Standard, having been prepared u
2、nder 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 28 February 1986 BSI 03-1999 First published, as BS 4887, May 1973 First revision, as BS 4887-1, February 1986 The following BS
3、I references relate to the work on this standard: Committee reference CAB/3 Draft for comment 85/10195 DC ISBN 0 580 14943 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Cement, Gypsum, Aggregates and Quarry Products Standards Committ
4、ee (CAB/-) to Technical Committee CAB/3 upon which the following bodies were represented: Brick Development Association British Aggregate Construction Materials Industries British Ceramic Research Association British Precast Concrete Federation British Ready Mixed Concrete Association Building Emplo
5、yers Confederation Cement Admixtures Association Cement and Concrete Association Cement Makers Federation Concrete Society County Surveyors Society Department of the Environment (Building Research Establishment) Department of Transport (Highways) Electricity Supply Industry in England and Wales Fede
6、ration of Civil Engineering Contractors Institution of Civil Engineers Institution of Structural Engineers Mortar Producers Association Plasterers Craft Guild Society of Chemical Industry Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fr
7、i Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 BSI 03-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3Performance requirements1 4Uniformity requirements1 5Information to be provided1 6Marking3 Appendix A Methods of sampling
8、admixtures4 Appendix B Preparation of mortars for acceptance tests4 Appendix C Acceptance tests on control mix and test mix mortars5 Table 1 Performance requirements and acceptance tests2 Table 2 Uniformity requirements and tests2 Table 3 Grading of sand5 Publications referred toInside back cover Li
9、censed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 ii BSI 03-1999 Foreword This Part of BS 4887 has been prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Committee and supersedes BS 4887:
10、1973 “Mortar plasticizers” which is withdrawn. It is intended to prepare, under the general title “Mortar admixtures”, further Parts to cover other admixtures now in use in building mortars. The admixtures specified in the 1973 edition of this standard were then called “mortar plasticizers” to indic
11、ate the main purpose for their use. A plasticizer of the type specified acts to improve workability by entraining air as small bubbles during mixing and so its name has been changed to “air-entraining (plasticizing) mortar admixture” to indicate how the admixture operates. Air-entrainment can confer
12、 other beneficial properties, such as improved frost resistance. Mortar admixtures are used in building mortars in small quantities to improve specific properties of the mortar. They may also affect other properties so it is necessary to demonstrate that these effects are not adverse. The test metho
13、ds included cover those properties of mortars likely to be important when they are used in bedding masonry units, plastering and rendering. All test methods have been taken from BS 4551; details of procedure are given in Appendix B and Appendix C. To reduce the effects of different raw materials on
14、test results, most test methods use a control mix and a mix containing the admixture. In this Part of BS 4887, only one mortar type and designation has been included to keep the amount of testing to a minimum. Evidence available to the committee indicates that there is no significant difference in t
15、he performance of those admixtures covered by this Part when the mortar includes lime. It is known that the properties of different raw materials as well as the use of different mixes can change the required dosage of an admixture. It is important that the user checks the properties of the mixes to
16、be used on site. A British 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 do
17、cument comprises a front 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
18、Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 BSI 03-19991 1 Scope This Part of BS 4887 specifies the requirements for performance and uniformity and methods of test for air-entraining (plasticizing) mortar admixtures used to modify
19、one or more of the properties of building mortars for use in bedding masonry units, plastering and rendering but not normally for use in screeding. NOTEThe titles of the publications referred to in this Part of BS 4887 are listed on the inside back cover. 2 Definitions For the purposes of this Part
20、of BS 4887 the definitions given in BS 2787 and BS 4049 apply together with the following. air-entraining (plasticizing) mortar admixture admixture that causes a controlled and stable quantity of air in the form of small bubbles to be incorporated during the mixing of mortar to improve its plasticit
21、y 3 Performance requirements The admixture shall enable a test mortar to comply with the performance requirements given in Table 1 when test mixes of the mortar, containing representative samples of the admixture taken as described in Appendix A, are prepared as described in Appendix B and subjected
22、 to the acceptance tests described in Appendix C. The test mix mortar containing the admixture shall be compared with a control mix mortar made on the same day under the same conditions and the mean results obtained from two comparisons shall be used to assess compliance with the performance require
23、ments. One batch of the test mix mortar on which to determine the air content after extra mixing and a second batch of the test mix mortar on which to determine the other properties required shall be compared on the same day with one batch of the control mix mortar. Consequently, a total of six mort
24、ar batches shall be prepared to make two comparisons and calculate the mean values. Batches of the admixture which have the same formulation, as described in 5.1c) and k) need not be tested individually for acceptance if they have been shown by the uniformity tests in clause 4 to have the same compo
25、sition as that of the admixture tested for acceptance and complying with the performance requirements. 4 Uniformity requirements Any batch of admixture shall have the same composition, as given in 5.1k), as that of the admixture tested for acceptance. To check this uniformity of composition, a sampl
26、e of the batch, taken as described in Appendix A, shall be tested in accordance with Appendices D and E of BS 5075-1:1982 and shall comply with the requirements given in Table 2. 5 Information to be provided 5.1 Test information The following test information shall be available in a certificate1). a
27、) The name, trade mark or other means of identification of the manufacturer. b) The trade designation of the product, i.e. brand name, reference number and/or letter. c) The description of the material, i.e. air-entraining (plasticizing) mortar admixture, its physical state (liquid or solid), its co
28、lour and the generic type of its main active constituent(s), e.g. alkali salt of wood resin, sulphated or sulphonated hydrocarbon. d) The name and location of the test laboratory where acceptance and uniformity tests were made and the date of testing. e) The sources of the cement and sand used in th
29、e tests. f) The quantity of admixture, calculated on the total dry mass of mortar, used in the test mix mortar. g) The water required to produce a mortar of standard consistence for each control and test mix mortar and the percentage water reduction for the test mix mortars. h) The stiffening times
30、for the control and test mix mortars. i) The air contents of the control mix mortar after standard mixing and of the test mix mortars at each of the three test conditions. j) The compressive strengths of the individual mortar cubes for the control and test mix mortars and the ratio of the mean compr
31、essive strength of the test mix mortar to that of the control mix mortar, expressed as a percentage, at age 7 days. k) The composition, as follows: 1) the dry material content; 2) the ash content; 3) the relative density of liquid admixture; 1) Information is normally provided by the manufacturer bu
32、t may be made available by a supplier after repackaging bulk material. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 2 BSI 03-1999 4) the chloride ion content, expressed as a percentage by mass of total admixture. Table 1 Pe
33、rformance requirements and acceptance tests Table 2 Uniformity requirements and tests Characteristic Reference Requirement (mean of two mixes) TestMix Reduction in water requirement for standard consistence C.2ANot less than 8 % Stiffening timeC.3ATime from completion of mixing to reach resistance t
34、o penetration of 1.0 N/mm2 for the test mix mortar to be within 1 h of the time for the control mix mortar Air content of test mix mortar after: a) standard mixingC.4.1A14 % to 20 % b) 1 h standingC.4.2ANot reduced by a figure of more than 3 % from the air content after standard mixing c) extra 15 m
35、in mixingC.4.3BNot changed by a figure of more than 5 % from the air content after standard mixing Compressive strength at 7 daysC.5ACompressive strength of the test mix mortar to be at least 70 % relative to that of the control mix mortar CharacteristicTest referenceRequirement Dry material content
36、D.1 of BS 5075-1:1982a) For liquid admixtures: to be within 3 % (m/m) of the value stated by the manufacturera b) For solid admixtures: to be within 5 % (m/m) of the value stated by the manufacturer Ash contentbD.2 of BS 5075-1:1982To be within 1.0 % (m/m) of the value stated by the manufacturer Rel
37、ative densityD.3 of BS 5075-1:1982For liquid admixtures: to be within 0.02 of the value stated by the manufacturer Chloride ion contentAppendix E of BS 5075-1:1982To be within 5 % of the value stated by the manufacturer or within 0.2 % (m/m), whichever is the greater a The term manufacturer througho
38、ut this standard includes the supplier where appropriate. b Not applicable to admixtures containing more than 1 % (m/m) of chloride ion. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 BSI 03-19993 5.2 General information The
39、following general information shall be available in writing2). a) The name, trade mark or other means of identification of the manufacturer. b) The trade designation of the product, i.e. brand name, reference number and/or letter. c) The description of the material, i.e. air-entraining (plasticizing
40、) mortar admixture, its physical state (liquid or solid), its colour and the generic type of its main active constituent(s), e.g. alkali salt of wood resin, sulphated or sulphonated hydrocarbon. d) Packaging, recommended storage conditions, maximum storage time before use and special precautions at
41、extremes of temperature, including instructions regarding liquids which have become frozen. Where any special requirements on storage life apply, they shall be stated. NOTEA certificate confirming that the storage recommendations have been followed should be provided by the manufacturer. e) Instruct
42、ions for use and any necessary safety precautions, e.g. if caustic, toxic or corrosive. f) Any known incompatibility with other admixtures or with certain types of cements, etc. g) The manufacturers recommended dosage or dosages. h) Effects of underdosage and overdosage. 6 Marking When admixtures ar
43、e supplied in containers they shall be clearly marked for the purposes of identification and indication of compliance with the following information. When the material is supplied in bulk at the point of delivery, the same information shall be provided in writing at the time of delivery. a) The name
44、, trade mark or other means of identification of the manufacturer. b) The trade designation of the product, i.e. brand name, reference number and/or letter. c) The description of the material, i.e. air-entraining (plasticizing) mortar admixture. d) The chloride ion content, expressed as a percentage
45、 by mass of total admixture. e) A summary of storage requirements including any special requirement on storage life, as indicated in 5.2d), which shall be clearly marked, e.g.: “This admixture shall not be taken to comply with the requirements of BS 4887-1:1986 after (date).” f) Instructions for use
46、 and any necessary safety precautions, e.g. if caustic, toxic or corrosive. g) The manufacturers recommended dosage or dosages. h) The number and date of this Part of this British Standard, i.e. BS 4887-1:19863). 2) Information is normally provided by the manufacturer but may be made available by a
47、supplier after repackaging bulk material. 3) Marking BS 4887-1:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries a
48、s to the availability of third party certification should be addressed to the appropriate certification body. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 09:10:30 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4887-1:1986 4 BSI 03-1999 Appendix A Methods of sampling admixtures A.1 General
49、Take samples of admixtures in accordance with the appropriate method given in A.2 to A.5. In all steps of the sampling procedure, minimize the exposure of the material to the atmosphere to avoid appreciable absorption of moisture or carbon dioxide, or the evaporation of moisture. A.2 Sampling of powdered materials from packages Each sample shall represent not more than 1 t of solid admixture. Sample six packages or 1 % of the number of packages, whichever is the greater, or, where the total number of packages does not exceed six, all the packages. Ensure that th