1、BRITISH STANDARD CONFIRMED SEPTEMBER 1985 BS 5273: 1975 Incorporating Amendment Nos1 and2 Specification Dense tar surfacing for roads and other paved areas UDC 625.859BS5273:1975 This British Standard, having been approved by the Road Engineering Industry StandardsCommittee, was published under the
2、authority ofthe Executive Board on 28 November1975 BSI 03-1999 The following BSI references relate to the work on this standard: Committee reference RDE/12 Draft for comment 74/42831DC ISBN: 0 580 08957 6 Co-operating organizations The Road Engineering Industry Standards Committee, under whose super
3、vision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Asphalt and Coated Macadam Association* Association of Consulting Engineers British Quarrying and Slag Federation* British Tar Industry Associ
4、ation* Cement and Concrete Association Concrete Society Contractors Plant Association County Surveyors Society* Department of the Environment* Department of the Environment (Transport and Road Research Laboratory)* Federation of Civil Engineering Contractors Federation of Manufacturers of Constructi
5、on Equipment and Cranes Greater London Council* Institute of Petroleum* Institute of Quarrying Institution of Civil Engineers* Institution of Highway Engineers* Institution of Municipal Engineers* Institution of Structural Engineers Ministry of Defence Refined Bitumen Association Road Emulsion Assoc
6、iation Road Surface Dressing Association Sand and Gravel Association Limited* Society of Chemical Industry* Individual experts The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on t
7、he committee entrusted with the preparation of this British Standard: Standardization of Tar Products Test Committee Individual expert Amendments issued since publication Amd. No. Date of issue Comments 4664 February 1985 7295 August 1992 Indicated by a sideline in the marginBS5273:1975 BSI 03-1999
8、i Contents Page Co-operating organizations Inside front cover Foreword ii Section 1. General requirements 1 Scope 1 2 References 1 3 Sampling and testing 1 4 Constituent materials 1 5 Composition of mixtures 2 6 Manufacture 2 7 Transport 3 Section 2. Specific requirements 8 DTS wearing course (crush
9、ed rock or slag fine aggregate) 3 9 DTS wearing course (sand fine aggregate) 5 Appendix A Notes on the use of DTS 6 Appendix B Recommendations for the laying of DTS 6 Appendix C Recommendations for the measurement of the temperature of DTS 8 Table 1 Properties of binders for coated chippings 3 Table
10、 2 Aggregate grading 3 Table 3 Binder content 4 Table 4 Mixing temperatures 4 Table 5 Aggregate grading 4 Table 6 Binder content 5 Table 7 Mixing temperatures 5 Table 8 Recommended average course thicknesses 6 Table 9 Temperature of laying and rolling 7 Publications referred to Inside back coverBS52
11、73:1975 ii BSI 03-1999 Foreword The British Road Tar Association 1)publication “Dense Tar Surfacing”, originally published in1954, was last fully revised in1966; it was reprinted in1968 with minor amendments, and an amendment sheet was issued in1972 in which there were alterations to the fine aggreg
12、ate grading in Table 2 for DTS wearing course (crushed rock or slag fine aggregate). This British Standard, prepared under the authority of the Road Engineering Industry Standards Committee, is a fully metricated version of the BRTA specification published in1966, including the subsequent amendments
13、 and with certain deletions. The specification for fine-textured wearing-course material is now included in BS4987 “Coated macadam for roads and other paved areas” and is called“6mm nominal size fine-textured tarmacadam”. BS4987 also includes40mm,28mm and20mm nominal size dense tarmacadam basecourse
14、 materials. Reference should be made to that British Standard for those materials. NOTEThis standard has been prepared using metric units as part of the national policy to change to the metric system. As a consequence there will be a transitional period during which material will still be supplied t
15、hat has been produced using equipment based on imperial sizes, and the original BRTA specification with1972 amendments will also continue to apply during this period. It is important, therefore, that the supplier should state, on his advice note to the purchaser, the specification to which he has su
16、pplied the material. Although the specification requires that the mixed material shall, on analysis, comply with the requirements of the respective tables, it should be realized that when any sampling procedure is used complete compliance with specification may not always be achieved with every samp
17、le tested, even when the material is satisfactory. This should be borne in mind when deciding whether or not the material is acceptable. It has not been found possible at this stage to introduce into the standard a system of compliance based on statistical methods. The term “mass” has been used in p
18、lace of the term “weight” in this standard. There is no explicit SI unit of weight, and when “weight” is used in the sense of “mass” the unit is the kilogram. The metric tonne(1000kg) is also used. A British Standard does not purport to include all the necessary provisions of a contract. Users of Br
19、itish Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity for illegal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, pages1 to10, an inside back cover and a back cove
20、r. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover. 1) Now the British Tar Industry AssociationBS5273:1975 BSI 03-1999 1 Section 1. General requirements 1 Scope This British Standard
21、specifies the composition, manufacture, testing and transport of dense tar surfacing (DTS), defined in BS892 as a hot process wearing course material consisting of aggregate, filler and road tar, in such gradings and proportions that when spread and compacted it provides a close textured impervious
22、mixture. Notes on the use of DTS are given in Appendix A. Recommendations for laying the materials and for measuring their temperatures are included in Appendix B and Appendix C. The mixtures specified are as follows: DTS (crushed rock or slag fine aggregate) 35% coarse aggregate content14mm and10mm
23、 nominal size 50% coarse aggregate content14mm and10mm nominal size DTS (sand fine aggregate) 35% coarse aggregate content14mm and10mm nominal size 50% coarse aggregate content14mm and10mm nominal size 2 References The titles of the British Standards referred to in this standard are listed on the in
24、side back cover. 3 Sampling and testing The importance of obtaining representative samples cannot be over emphasized. Sampling and testing shall be carried out in accordance with the appropriate clauses of the following British Standards: Binders:BS76 and BS3690-1 and BS3690-3 Aggregates:BS812 and B
25、S1047 Dense tar surfacing:BS598 The analysis methods given in BS598 are based on wet sieving. The passing754m values specified in Table 2 and Table 5 of this standard have been adjusted to allow for this and therefore no wet/dry sieving correction shall be employed. 4 Constituent materials 4.1 Binde
26、r. The tar shall conform to the requirements of BS76. The viscosity of the tar shall be selected according to the traffic volume and the climatic conditions. The following figures are given as a guide: NOTETraffic volume in commercial vehicles per day (c.v.d.) is the number of such vehicles, being d
27、efined as goods or public service vehicles of unladen mass exceeding1500kg, counted normally in one direction over16h. The levels given above refer to the existing traffic levels, not the projected levels. The supplier shall state the proportion of tar which is insoluble in the toluene or other solv
28、ent used for the determination of binder content together with the density of the tar at20C. 4.2 Aggregate 4.2.1 Coarse aggregate. The coarse aggregate shall be crushed rock, slag or gravel as approved by the purchaser and shall be substantially free from material passing a3.35mm BS sieve 2) . When
29、gravel is used the clay and silt content shall not exceed1% by mass of the coarse aggregate when determined in accordance with the sedimentation or decantation methods given in BS812-1. In the event of a dispute the sedimentation method shall be used. 4.2.2 Fine aggregate. For the purposes of this s
30、tandard, fine aggregate is material substantially passing a3.35mm BS test sieve. The fine aggregate shall consist of crushed rock, slag or sand or mixtures thereof and the type shall be subject to approval by the purchaser. When sand is used the clay and silt content shall not exceed3% by mass of th
31、e fine aggregate when determined in accordance with the sedimentation or decantation methods given in BS812-1. In the event of a dispute the sedimentation method shall be used. 4.2.3 Crushed rock. Crushed rock shall be hard, clean, durable material of one or more of the types listed below. The suppl
32、ier shall, if required by the purchaser, inform him of the group, or groups, to which the aggregate belongs. a) Granite group b) Basalt group c) Gabbro group d) Porphyry group e) Quartzite group Category Grade A 300c.v.d. or more C54 B 50c.v.d. to300c.v.d. C50 or C54 C less than50c.v.d. C46 or C50 2
33、) BS410.BS5273:1975 2 BSI 03-1999 f) Hornfels group g) Gritstone group h) Limestone group It is recognized that certain aggregates may not belong to any of the groups given above. If it is proposed to use an aggregate of another type, the attention of the purchaser shall be called to the fact and hi
34、s approval of the proposed composition obtained. 4.2.4 Slag. Blast-furnace slag shall comply with the following requirements: a) Stability. The slag shall comply with the stability requirements of Appendix A of BS1047:1983. slag shall not exceed2.75%, determined in accordance with the method given i
35、n AppendixB.2 of BS1047:1983. c)Bulk density or unit mass. The bulk density or unit mass shall be the “rodded” or compacted mass determined in accordance with the method described in BS812, and shall be no lower than1100kg/m 3 . The samples of slag to be used in this test shall all pass the14mm BS t
36、est sieve and be retained on the10mm BS test sieve, and shall be tested in the oven-dried condition. The supplier shall state the bulk density of the slag used if required by the purchaser. Steel slag, whether electric-arc furnace or basic oxygen slag, shall be weathered until it is no longer suscep
37、tible to falling. The compacted density (seec) above) shall be between1700kg/m 3 and1900kg/m 3 . NOTEOther slags may be suitable aggregates for dense tar surfacing but are outside the scope of this standard. 4.2.5 Gravel. The gravel shall be from one or more of the groups given in4.2.3 or shall be f
38、lint. It may be crushed or uncrushed, or a mixture of both. 4.3 Filler. The added filler shall consist of fine mineral dust prepared from limestone, other crushed rock or slag. The approval of the purchaser shall be obtained if it is the intention to use any other material. The added filler shall ha
39、ve the following properties: Bulk density within the range0.5g/ml to0.8g/ml when tested in accordance with the method given in BS812-2. Void content of the dry compacted materials within the range0.3 to0.4 when tested in accordance with the method given in BS812-2. 4.4 Chippings for application to s
40、urface of wearing course 4.4.1 General. The chippings to be rolled into the surface of DTS wearing courses and their manner of coating shall comply with the requirements given below. (For the application of the chippings see B.7.) 4.4.2 Chippings. The chippings shall comply with the requirements of
41、BS63, shall be of either20mm or14mm nominal size and shall have a size and shape index of60 or less. NOTESize and shape index=Percentage of undersize 3) +Flakiness index 4) . 4.4.3 Coating. The binder used for coating the chippings prior to application shall conform to the requirements of Table 1. T
42、he chippings shall be completely coated with the specified binder at a rate, found on analysis, of1.5 0.3% by mass. The analysis shall be carried out on chippings taken from the stockpile when their temperature is below130C. The chippings shall be dried and fed into the mixer at a temperature of130C
43、 to185C. The binder shall be added at a temperature not exceeding175C and the coated chippings on discharge from the mixer shall be in the range130C to185C. In order to minimize the formation of insoluble material in the binder the coated chippings shall, on discharge from the mixer, be cooled quick
44、ly to ambient temperature by the application of clean water or by spreading out in a layer not exceeding1.0m in thickness. Chippings shall be cooled to and maintained below160C. 5 Composition of mixtures The composition of freshly mixed DTS shall comply on analysis with the appropriate requirements
45、in section 2. Where the characteristics of the aggregate are such that it requires, a binder content other than that given in section 2, a new target binder content shall be agreed between the manufacturer and the purchaser, and the same tolerances shall be applied. In the case of blast-furnace slag
46、 aggregate the supplier shall declare its bulk density. 6 Manufacture The aggregate and the binder shall not be heated above the appropriate maximum temperatures specified in Table 4 and Table 7. Before coating, the aggregate shall be adequately dried. Passing3004m BS sieve 100% Passing754m BS sieve
47、 75% to100% 3) Percentage of undersize is the percentage less than the specified size as given in BS63. 4) Flakiness index as determined in accordance with BS812.BS5273:1975 BSI 03-1999 3 Table 1 Properties of binders for coated chippings Table 2 Aggregate grading The materials, including filler, sh
48、all be weighed or measured into a mechanical mixer and mixed in such a manner that the DTS on discharge from the mixer is uniform in composition and all particles of the aggregate are completely coated. NOTEAttention to temperature is essential. It is particularly important to avoid excessive heatin
49、g of the tar binder, both during storage and by excessively hot aggregate at the time of mixing, so as not to adversely affect the quality of the DTS. 7 Transport The DTS shall be transported from the manufacturing plant to the site of the work in clean vehicles and shall be properly sheeted to prevent heat loss and as a protection against adverse weather. The use of dust, coated dust, oil or water on the interior of vehicles to facilitate discharge of the DTS is permissible, but the amount shall be kept to a minimum, and any excess removed by brush
