1、BRITISH STANDARD BS 2832:1957 Incorporating Amendment No. 1 Hot applied damp resisting coatings for solumsBS2832:1957 This British Standard, having been approved by the BituminousProducts Industry Standards Committee and endorsed by the Chairman of theBuilding Divisional Council, was published under
2、 the authorityof the General Councilon 18 February 1957 BSI 12-1999 The following BSI references relate to the work on this standard: Committee references BMB/2 BMB/2/2/1 Draft for comment CW(BMB)5344 ISBN 0 580 34076 7 Co-operating organizations The Bituminous Products Industry Standards Committee,
3、 under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of British Roofing Felt Manufacturers Association of Tar Distillers* D.S.I.R. Building Research Station* Federat
4、ion of Civil Engineering Contractors* Institute of Petroleum* Institution of Civil Engineers* Institution of Structural Engineers Ministry of Housing and Local Government* Ministry of Works* National Association of Master Asphalters* National Employers Federation of the Mastic Asphalt Industry* Nati
5、onal Federation of Building Trades Employers* Natural Asphalte Mine-Owners and Manufacturers Council* Royal Institute of British Architects* Royal Institution of Chartered Surveyors* Society of Chemical Industry The Government departments and scientific and industrial organizations marked with an as
6、terisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of County Councils in Scotland Department of Agriculture for Scotland Department of Health for Scotland Federation of Civil Engineeri
7、ng Contractors (Scottish Branch) Institution of Municipal Engineers (Scottish Branch) Limestone Federation Royal Institution of Chartered Surveyors (Scottish Branch) Scottish National Building Trades Federation (Employers) Amendments issued since publication Amd. No. Date of issue Comments 5956 July
8、 1989 Indicated by a sideline in the marginBS2832:1957 BSI 12-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Definition 1 Part 1: Coal tar pitch 2 Scope 1 3 Origin and preparation 1 4 Characteristics 1 5 Application 2 6 Tests 2 7 Certificate and marking 2 Part 2: Pi
9、tch-sand mixture 8 Scope 2 9 Preparation 2 10 Characteristics 3 11 Certificate of marking 3 Part 3: Asphaltic bitumen 12 Scope 3 13 Material 3 14 Characteristics 3 15 Application 3 16 Tests 4 17 Certificate and marking 4 Appendix A Softening point of the pitch and filler 5 Appendix B Notes on the us
10、e of pitch coatings 5BS2832:1957 ii BSI 12-1999 Foreword This standard makes reference to the following British Standards: BS 76, Tars for road purposes. BS 144, Coal tar creosote for the preservation of timber. BS 410, Test sieves. BS 1310, Coal tar pitches for building purposes. BS 2000, Methods o
11、f test for petroleum and its products Part 34: Flash point by Pensky-Martens closed tester. This British Standard has been issued under the Authority of the Bituminous Products Industry Standards Committee at the request of the BSI Building and Engineering Services Committee in Scotland in order to
12、provide quality requirements for the pitch or bitumen used in Scotland as an oversite coating under floors. Three types of coating are given in the standard, two applied in liquid form, and one containing a sandfiller, which is often referred to commercially as “unfinished asphalt” or “unfinished Br
13、itish asphalt”. It has been found, however, that this term is frequently used to refer to coatings not containing sand and sometimes it is indiscriminately used to refer to all three types of coating. For this reason the term has not been used in this British Standard and it is hoped and strongly re
14、commended that the description “BS 2832, Part 1”, “Part 2”, or “Part 3” is used to indicate the mixture required, even when it is also referred to by the commercial name mentioned above. Misunderstandings in regard to the type being specified will thus be avoided by both purchaser and supplier. Pend
15、ing the issue of a Code of Practice dealing with the use of these coatings some guidance is given in an appendix to this standard. Since the publication of this standard, there have been considerable changes in the availability of coal-tar derived feed stocks. Tar from gas works has disappeared, whe
16、reas tar from smokeless fuel production has increased. A satisfactory hot-applied damp resistant coating for solums can be produced from tars derived from some of these low temperature carbonization processes. A British Standard does not purport to include all the necessary provisions of a contract.
17、 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 cover, an inside front cover, pages i and ii, pages1 to 6, an inside back cover an
18、d 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.BS2832:1957 BSI 12-1999 1 1 Definition For the purpose of this British Standard the term “solum” means the area of gro
19、und within the perimeter walls of a building. Part 1: Coal tar pitch 2 Scope Part 1 of this British Standard specifies the quality requirements for pitch of a type suitable for spreading over the solum in order to provide adequate damp proofing and prevent the evaporation of moisture. 3 Origin and p
20、reparation The pitch shall be prepared either: a) directly by the distillation of crude coal tar produced as a by-product of the carbonization of coal, or, b) by fluxing with a refined coal tar, or coal-tar oil, a harder pitch obtained directly by the distillation process. 4 Characteristics The pitc
21、h shall be a uniform material complying with grade C54 of BS76, “Tars for road purposes”, of with the following requirements: The latter material may be prepared by cutting back harder pitch with refined tar conforming to grade C30 of BS76, “Tars for road purposes”, or with heavy tar oils conforming
22、 with the following requirements: The methods of test shall be those specified in BS144, “Coal tar creosote for the preservation of timber”. The harder pitch shall conform to the following specification: Softening point (R. & B.) C 40 3 Specific gravity at 15.5/15.5 C 1.13 to 1.29 Matter insoluble i
23、n pure toluole 25 max. per cent Ash 0.6 max. per cent Water content 0.5 max. per cent Distillation: Below 270 C 5 max. per cent Below 300 C 10 max. per cent Specific gravity 15.5/15.5 C not less than 1.01 Water not exceeding 1.0 per cent by weight Distillation: Below 235 C not more than 5 per cent b
24、y weight Below 270 C not more than 20 per cent by weight Fluidity the oil shall be completely fluid at the prevailing atmospheric temperature at the time of mixing. Flash point not lower than82 C (180 F) when determined by the method described in BS2000 “Methods of test for petroleum and its product
25、s” Part 34 “Flash point by Pensky-Martens closed tester”. Softening point (R. & B.) C 70 to 80 Specific gravity at 15.5/15.5 C 1.15 to 1.33 Matter insoluble in pure toluole 30 max. per cent Ash 0.8 max. per cent Water content 0.5 max. per centBS2832:1957 2 BSI 12-1999 The quantity of refined tar or
26、tar oil required to give the standard oversite coating pitch shall be stated by the supplier of these materials or, alternatively, the requisite quantities shall be determined by preparation of a trial batch and testing. 5 Application There are two methods: 1) Pitch delivered cold to the site. This
27、shall be heated slowly to a temperature not exceeding120 C (248 F) to give a smooth homogeneous liquid. This temperature shall at no time be exceeded during the process of melting. 2) The delivery of tested hot material in bulk, in lagged road tank wagons. This is the desirable method and the materi
28、al shall be delivered at site at a temperature agreed between contractor and supplier within the range of 132100 C (270212 F). Whichever method is used, prolonged heating, once the pitch has melted, is likely to impair its characteristics and shall be avoided at every stage of the process. 6 Tests T
29、he tests for the characteristics of the pitch shall be carried out in accordance with Appendices C, E, F and H of BS1310, “Coal-tar pitches for building purposes”, on samples which are taken in accordance with AppendixD of that standard. 7 Certificate and marking The supplier shall state on his quot
30、ation or invoice that the oversite pitch-coating material used complies with the requirements of this British Standard. Any labels used on containers shall carry the name or identification mark of the supplier and the number of this British Standard,i.e.BS2832. In the absence of these sources of inf
31、ormation the purchaser may ask for a certificate of compliance, which shall be given by the supplier. Part 2: Pitch-sand mixture 8 Scope Part 2 of this British Standard specifies the composition and quality requirements for a soft pitch-sand mixture suitable for spreading over the solum in order to
32、provide adequate damp proofing and prevent the evaporation of moisture. 9 Preparation The proportions of the materials to be taken for the mixture shall be as follows: The pitch shall be heated slowly until completely fluid and until the temperature is within the range100120 C (212248 F). The pitch
33、shall be continuously agitated whilst first the tar oil and then the dry sand are added. The mixture shall then be agitated until a uniformly smooth consistency is obtained. Pitch hardness grade LT71 grade HT78 lb lb Coal tar pitch (to BS 1310 of the grade indicated) 985 935 Heavy tar oil (as define
34、d in Part 1) 225 275 Clean, dry, fine sand a 2,240 2,240 a Sea sand, if used, shall have been thoroughly washed.BS2832:1957 BSI 12-1999 3 10 Characteristics The ash content of the mixture shall not exceed65.0per cent by weight. The softening point (R. and B.) of the pitch and filler content, when ex
35、tracted and tested by the method given inAppendix A, shall be: 40 4 C (104 7 F) 11 Certificate of marking The contractor shall state on his quotation or invoice that the mixture supplied complies with the requirements of this British Standard. In the absence of these sources of information the purch
36、aser may ask for a certificate of compliance, which shall be given by the contractor. Part 3: Asphaltic bitumen 12 Scope Part 3 of this British Standard specifies the quality requirements for bitumen of a type suitable for spreading over the solum in order to provide adequate damp proofing and preve
37、nt the evaporation of moisture. 13 Material For the purposes of this specification the type of bitumen is the semi-solid product obtained from the distillation of asphaltic-base petroleum, consisting essentially of hydrocarbons and substantially soluble in carbon disulphide. 14 Characteristics The b
38、itumen shall be a uniform material and, when tested by the methods specified in Clause5, shall conform to the following requirements: 15 Application There are two methods: 1) Asphaltic bitumen delivered cold to the site. This shall be slowly heated to a temperature of not less than132 C (270 F) and
39、not greater than 176 C (350 F) to give a smooth homogeneous liquid. The higher temperature shall at no time be exceeded during the process of melting. 2) The delivery of tested material in bulk, in lagged road tank wagons. This is the desirable method and the material shall be delivered at site at a
40、 temperature agreed between contractor and supplier within the range of132100 C (273212 F). Whichever method is used, prolonged heating, once the bitumen has melted, is likely to impair its characteristics and shall be avoided at every stage of the process. Summer Grade Winter Grade Penetration at 2
41、5 C 80 to 100 mm/10 120 to 140 mm/10 Softening point (R. and B.) 44 to 48 C 40 to 44 C Ductility at 25 C 100 cm min. 100 cm min. Loss on heating (per cent by weight) after 5 hours at 163 C 1 per cent max. 1 per cent max. Drop in penetration after heating 20 per cent max. 20 per cent max. Bitumen con
42、tent (solubility in trichloroethylene) 99 per cent min. 99 per cent min. Specific gravity at 25 C 1.00 to 1.04 1.00 to 1.04BS2832:1957 4 BSI 12-1999 16 Tests Pending the preparation of British Standard methods of test the tests for the characteristics of the bitumen shall be carried out in accordanc
43、e with the methods specified by the Institute of Petroleum and given in the current edition of “Standard Methods of Testing Petroleum and its Products”, published by the Institute of Petroleum. These are as follows: 17 Certificate and marking The supplier shall state on his quotation or invoice that
44、 the bitumen complies with this British Standard. Any labels used on containers shall carry the name or identification mark of the supplier and the number of this British Standard,i.e.BS2832. In the absence of these sources of information the purchaser may ask for a certificate of compliance, which
45、shall be given by the supplier. Penetration at 25 C IP 49/56 Softening point (ring and ball) IP 58/56 Ductility at 25 C IP 32/55 Loss on heating IP 45/55 Bitumen content IP 47/55 Specific gravity IP 59/55BS2832:1957 BSI 12-1999 5 Appendix A Softening point of the pitch and filler Since it is difficu
46、lt to ascertain the softening point of the mixture due to the presence of the sand, particles larger than200mesh are removed and the required softening point has been fixed accordingly, after taking account of the effects of this procedure. A representative sample of about200g of the pitch-sand mixt
47、ure shall be placed in a vessel of approximate dimensions 2 1 / 2in. 2 1 / 2in., covered with a lid and placed in an oven maintained at a temperature of90100 C (194212 F) for3hours. The top layer shall then be poured off on to a 200-mesh BS sieve 1)resting on a suitable container, both having been p
48、reviously heated in the same oven to90100 C. A lid is then placed on the sieve and filtration allowed to proceed in the oven. When a sufficient quantity of filtrate, consisting of pitch and filler, has accumulated it shall be mixed and the softening point determined by the ring and ball method. (App
49、endix B, BS1310.) Appendix B Notes on the use of pitch coatings Beneath the suspended ground floors of structures, and particularly beneath timber floors, it is necessary to restrict the evaporation of ground dampness and deter the growth of vegetation over the solum,i.e.the area of ground within the perimeter walls of a building. The treatment commonly adopted, after clearing the solum of top soil and vegetation, is to lay hardcore or bottoming4to6in. thick and to blind this with fine dry ashes up to a thic
