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1、BRITISH STANDARD BS 598-107: 1990 Incorporating Amendments Nos. 1, 2 and 3 Sampling and examination of bituminous mixtures for roads and other paved areas Part 107: Method of test for the determination of the composition of design wearing course rolled asphalt ICS: 93.080.20 Licensed Copy: sheffield
2、un sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 This British Standard, having been prepared under the direction of the Road Engineering Standards Policy Committee, was published under the authority of the Boards of BSI and comes into effect on 28 Se
3、ptember 1990 BSI 11-1999 The following BSI references relate to the work on this standard: Committee reference RDB/36 Draft announced in BSI News, April 1990 ISBN 0 580 18693 8 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Road Enginee
4、ring Standards Policy Committee (RDB/-) to Technical Committee RDB/36 upon which the following bodies were represented: British Aggregate Construction Materials Industries British Civil Engineering Test Equipment Manufacturers Association British Tar Industry Association County Surveyor s Society De
5、partment of the Environment (Property Services Agency) Department of Transport (Highways) Department of Transport (Transport and Road Research Laboratory) Institute of Asphalt Technology Institute of Petroleum Institution of Civil Engineers Institution of Highways and Transportation Mastic Asphalt C
6、ouncil and Employers Federation Mastic Asphalt Producers Association Refined Bitumen Association Ltd. Sand and Gravel Association Ltd. Society of Chemical Industry Coopted members Amendments issued since publication Amd. No.Date of issueComments 8399January 1995 9032May 1996 10673November 1999 Indic
7、ated by a sideline Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 BSI 11-1999i Contents Page Committees responsibleInside front cover Forewordii 1Scope1 2Definitions1 3General1 4Apparatus1 5Preliminary test procedures on con
8、stituent materials9 6Preparation of constituent materials9 7Mixing and compaction11 8Procedure for measuring relative density and for calculating compacted aggregate density13 9Procedure for the measurement of stability and flow values13 10Evaluation of design binder content14 11Reporting15 Appendix
9、 A Calibration and checking of oven17 Figure 1 Suitable design of whisk for a planetary mixing unit4 Figure 2 Suitable design of compaction equipment5 Figure 3 Hand compaction hammer6 Figure 4 Compaction pedestal7 Figure 5 Testing head8 Figure 6 Example of determination of stability and flow value u
10、sing a chart recorder and load cell15 Figure 7 Example of mixture design16 Table 1 Aggregate proportions for mix-design procedure10 Table 2 Mass of aggregate for trial mixes11 Table 3 Binder proportions required for mix-design procedure11 Table 4 Middle of the range binder contents12 Table 5 Correct
11、ion factors for stability values with variation in height or volume14 Table 6 Factors for the calculation of design binder content14 Publications referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 ii
12、 BSI 11-1999 Foreword This part of BS 598 has been prepared under the direction of Technical Committee B/510. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted to appropriate qualified and experienced people. A British Standard does not pu
13、rport 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 cover, an inside front
14、 cover, pages i and ii, pages 1 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Licensed Copy: sheffieldun sheffieldun, na, Mon D
15、ec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 BSI 11-19991 1 Scope This part of BS 598 describes a method for the determination of the composition of design wearing course rolled asphalt. NOTEThe titles of the publications referred to in this standard are listed on the in
16、side back cover. 2 Definitions For the purposes of this part of BS 598 the definitions given in BS 6100 apply together with the following. NOTEThese definitions apply specifically to the design method. 2.1 stability the maximum resistance to deformation in newtons of a moulded asphalt specimen 2.2 f
17、low the deformation of the moulded specimen in millimetres at the point of maximum resistance 2.3 mix density the mass of asphalt mixture per unit volume of the compacted specimen 2.4 design binder content the binder content of an asphalt mixture 3 General Aggregate compositions suitable for wearing
18、 course rolled asphalt that is to be specified by the design method are given in Table 3 and Table 4 of BS 594-1:1985. This part of BS 598 describes the procedure to be followed when deciding a suitable binder content for a chosen aggregate composition. The appropriate binder content will differ, fo
19、r any particular grading of aggregate, according to the nature and source of the aggregate, hence the need for a design procedure, particularly if an unfamiliar aggregate source is to be used. It has to be emphasized that the design procedure is not simple and takes time. At least three consecutive
20、working days are needed to carry out the procedure properly, and great care and attention to detail are essential if a reliable result is to be obtained. Precise conformity to all the requirements for apparatus and procedure will give a binder content that can be used with confidence in specificatio
21、n; other equipment and the use of short cuts and variation in procedure will almost certainly give misleading results. The procedure gives a binder content, called the design binder content, which is a compromise between the conflicting needs of stability, durability and workability. The method invo
22、lves the determination of a binder content of the complete mix using Marshall test equipment. Specimens for test are made with the aggregate required for use in the plant mix and with a range of binder contents using the grade of binder proposed for the actual job. Marshall stability, flow and densi
23、ties are determined by defined procedures which also permit the calculation of other properties. Appendix B of BS 594-1:1985 gives advice on the application of test data obtained from the design procedure for deciding the best composition of wearing course asphalt for a given site. Suggestions are a
24、lso given in the same appendix on the verification procedure to be adopted. 4 Apparatus NOTEAll dimensions are nominal unless tolerances are given. 4.1 Balance, of not less than 2 kg capacity, accurate to 0.1 g. NOTEA second balance, accurate to 0.5 g, is convenient for proportioning aggregates, fil
25、ler and binder. 4.2 Oven, complying with appendix A with fan assisted air circulation, fitted with thermostatic control to maintain temperature in the range 80 C to 200 C. NOTETwo ovens may be found to be convenient. Aggregates, moulds and steel blocks may be heated in one oven and binder in a small
26、er oven with a time switch controller. 4.3 Mechanical mixing unit, of not more than 8 L capacity, capable of combining 1 500 g of aggregate, filler and binder speedily and thoroughly without loss. NOTEA mechanical mixer with detachable mixing bowl and accurately controlled heating element capable of
27、 maintaining the bowl at the required temperature is suitable. A wire whisk of adequate strength is normally found most suitable and the design illustrated has been found to be satisfactory for planetary mixers. 4.4 Whisk, of a suitable design such as that shown in Figure 1. NOTE 1Alternative design
28、s of the whisk head to that shown in Figure 1 are suitable providing the wire scrapes the bowl sides. NOTE 2Since the wire blades wear out quickly, an economical method of obtaining a whisk is to purchase a boss and bayonet fitting as shown and to produce and fit the wires separately. 4.5 Steel moul
29、d cylinders, with a 101.6 0.1 mm internal diameter, complete with mould bases and extension collars as shown in Figure 2, sufficient in number to enable the work to continue as required. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598
30、-107:1990 2 BSI 11-1999 4.6 Steel compaction hammer, of total mass 7 850 50 g including a sliding weight of 4 535 25 g with a free fall of 457 5 mm that acts upon the foot assembly as shown in Figure 3. The apparatus shown in Figure 2 is suitable for hand compaction. The foot assembly shall comprise
31、 a spring housing and a helical compression spring of hardened and tempered steel with a load rate of 10 N/mm to 18 N/mm and designed to exert a preload of 80 N to 150 N when confined within the foot assembly leaving a minimum movement of 20 mm. The foot of the hammer shall be machined flat and smoo
32、th and be securely fixed to the foot assembly. 4.7 Automatic compactor, the mass, free fall and design of the complete hammer foot assembly being as specified in 4.6. The operating mechanism shall not be supported by the laminated hardwood block of the compaction pedestal. The free fall height shall
33、 be measured when the machine is in operation and be capable of being maintained within the specified tolerances throughout the compaction procedure. The automatic mechanism shall be capable of applying 50 blows at the rate of 60 5 blows per minute. NOTEThe use of an automatic compactor is recommend
34、ed particularly in cases of dispute. 4.8 Steel block, of 100 mm diameter by not less than 50 mm high. This is used for the initial heating of the compaction hammer. NOTEThe use of more than one block may be advantageous. 4.9 Compaction pedestal, as shown in Figure 4 and consisting of the following.
35、a) Vibrated concrete base, of minimum density 2 200 kg/m3 and minimum dimensions 450 mm 450 mm 200 mm with a shoulder to receive a laminated hardwood block. b) Laminated hardwood block, 200 4 mm 200 4 mm in cross-section and 450 4 mm in height, made from straight-grained, seasoned timber (such as sa
36、pele) free from shakes, splits and knots with a density of 560 kg/m3 to 720 kg/m3 at a moisture content of 8 % to 10 %. The block shall be built up of between six and ten approximately equal laminations of quarter sawn board bonded with waterproof resin glue. The ends shall be smooth and normal to t
37、he vertical axis and the block shall be treated with a water-resistant impregnant and varnished to minimize changes of moisture content. c) Mild steel plate, 300 5 mm 300 5 mm 25 1 mm fitted with a positive location to receive the hardwood block and with a mould assembly holder to secure the mould a
38、ssembly centrally on the pedestal during compaction and a guide to ensure that the hammer is maintained in a truly vertical position throughout compaction. The mild steel plate with assembly holder and guide shall be secured to the base with four tie rods each tensioned to the equivalent of a torque
39、 of 10 1 N m on an M10 thread. NOTEThe compaction pedestal plays an important part in the compaction of specimens and it is essential that it conforms with the detailed description. 4.10 Extractor, of suitable design to eject the specimens from the moulds without distortion or shock to the specimens
40、. 4.11 Water bath, fitted with thermostatic control to maintain the temperature at 60 0.5 C, with a tray or trays and deep enough to allow at least 25 mm depth of water above and below the specimens. It shall be made so that the specimens can be placed flat face down and not in contact with one anot
41、her. The bath shall be fitted with one or more pumps, impellers or stirring devices to ensure a continuous circulation of water around the specimens. NOTEIt is recommended that the water bath be large enough to hold a minimum of 15 specimens. 4.12 Steel or cast iron testing head, as shown in Figure
42、5, having segments machined to an inner radius of 50.8 0.05 mm. 4.13 Compression testing machine, having a minimum capacity of 22 kN and capable of applying a constant rate of strain to the specimens of 50 3 mm/min under all loading conditions. The load measurement device shall be calibrated in acco
43、rdance with BS 1377-1 or BS 1610-1. Means of measuring flows of up to 10 mm with an accuracy of 0.1 mm and of indicating the maximum load and flow achieved during the test shall be provided. NOTEMethods by which the test data can be retained as a printed or graphical display are preferred. Any such
44、device should be capable of recording load to an accuracy of grade B of BS 1610 and flow to an accuracy of 0.1 mm. 4.14 Riffle box, of sufficient size to blend samples of aggregates prior to weighing out to ensure representative sampling (see clause 6). Licensed Copy: sheffieldun sheffieldun, na, Mo
45、n Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 BSI 11-19993 4.15 Cans, containers and trays, comprising binder cans fitted with lids, aggregate containers and trays of adequate capacity. 4.16 Silicone grease. A grease to Ministry of Defence Standard 50-101) is suitable.
46、 4.17 Spatulas, as follow: size 1: with blade approximately 150 mm long 25 mm wide size 2: with blade approximately 200 mm long 32 mm wide. 4.18 Sieves, having apertures of 2.36 mm and 75 m and complying with BS 410. 4.19 Heat-resistant gloves. 1) MOD standard 59-10 “ Insulating and filling compound
47、s (insulating compound, electric/silicon grease type)” published by Directorate of Standardization, Ministry of Defence, London. Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 4 BSI 11-1999 Figure 1 Suitable design of whisk
48、for a planetary mixing unit Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 BSI 11-19995 Figure 2 Suitable design of compaction equipment Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontr
49、olled Copy, (c) BSI BS 598-107:1990 6 BSI 11-1999 Figure 3 Hand compaction hammer Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 BSI 11-19997 Figure 4 Compaction pedestal Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 598-107:1990 8 BSI 11-1999 Figure 5 Testing head Licensed Copy: sheffieldun sheffieldun, na, Mon Dec 04 16:35:20 GMT+00:00 200
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