SANS 10120-2 MG-1996 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 2 Project specification Section MG Bit.pdf

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3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. SABS 0120-2 Section MG:l996 Bituminous surface treatment First revision Part 2 : Project specification, Portion 2 Section MG Contents 1 Essentiai project

4、 specification clauses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . l 2 Essentialdata 1 3 Additionalclauses . l 3.1 General . 1 3.2 Normalprojects . 1 3.2.1 Sandsal 2 3.2.2 Final rolling of aggregate (double surface

5、 treatment) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 3.2.3 Mass batching of slurry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . 2 3.2.4 Initialtes

6、ting 2 3.3 Prestigeprojects . 2 3.4 Subeconomic projects . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , . . . 2 3.5 Labour-basedproj . 3 First Revision 24 June 1996. This section of the code supersedes SABS 0120

7、2 : Section MG:1981 Approved by the PRESIDENT OF THE SOUTH AFRICAN BUREAU OF STANDARDS CODE OF PRACTICE SABS 0120-2 : Section MG:1996 SABS 1200 MG : Bituminous surface treatment NOTES 1 Number the PSMG clauses in portion 2 of the project specification in the sequence in which the clauses to which t

8、hey relate appear in SABS 1200 MG. 2 The clause number(s) given in brackets at the beginning or after the heading of a clause istare, unless otherwise stated, the number(s) of the relevant clause(s) of SABS 1200 MG. 1 Essential project specification clauses Set out suitable clauses in portion 2 of t

9、he project specification to provide essential information as follows: a) (5.5.1) Specify whether one or two coats of bituminous binder are required. b) (5.5.1) Specify whether one or two coats of slurry seal are required. 2 Essential data The availability of certain essential data could affect the p

10、rices tendered. Except where such data have been given in the schedule or on the tender drawings, set out suitable clauses covering items such as the following in portion 2 of the project specification: a) (Clause 1) State the surface treatment required. b) (3.1) When relevant, state which prime is

11、to be used. c) (3.3 and 3.5) State which types and grades of bituminous binders are to be used. d) (3.6) State whether grade 1, grade 2 or grade 3 aggregate is required. e) (3.7) State the grade or type (or both) of slurry required. f) (3.9) When relevant, state which filler is to be used. g) (5.2)

12、State whether a prime coat is required and, if so, the type and, when relevant, the grade and over which parts of the works it is required. h) (5.4.1) When relevant, state the nominal sizes of aggregate to be used for double surface treatment. i) (5.4.6) State whether a fog spray is required. If so,

13、 provide a schedule item. j) (5.4.7) When relevant, state whether pre-coating of the second application of aggregate is required for double surface treatment. If so, provide schedule items and, where necessary, amend the pre-coating application rate. k) (5.5.1) When relevant, state the nominal size

14、of aggregate and the number of applications of bituminous binder and of slurry seal required. 1) (5.6.1) When relevant, state the nominal size of aggregate to be used for single surface treatment. m) Unless details have been set out in the drawings, provide a list of street names or road sections to

15、 be surfaced and, in respect of each street or road section, state the type of base, whether a prime is required, the type of surface treatment (including the aggregate sizes) and in the case of double surface treatment, whether pre-coating of the second application of stone chips is required and wh

16、ether a fog spray is required. 3 Additional clauses 3.1 General Where it is necessary to amplify or otherwise to vary the terms of SABS 1200 MG to render them suitable for use in projects to be carried out in particular locations or under particular circumstances, include suitable PSMG clauses in po

17、rtion 2 of the project specification to deal with matters in addition to those covered by clauses 1 and 2 above. 3.2 Normal projects NOTE - To meet requirements imposed by various norms of economic development, projects are classified as normal, prestige, subeconomic and labour-based projects (see c

18、lause 4 of the Introduction to SABS 0120-3). SABS 0120-2 Section MG:1 W6 Bituminous surface treatment First revision 3.2.1 Sand seal 3.2.1 .l Bitumlnaus binder (3.5) Note that RTW 15/20 road tar, which is low in volatiles, is available and recommended by Iscor, but is not covered by SABS 748) (see t

19、he preface to SABS 748). 3.2.2 Final rolling of aggregate (double surface treatment) Subclauses 4.4.2 ancl 4.4.3 of SABS 1200 MG make provision for both pneumatic-tyred rollers and flat steel-tyred rollers but provision is, made in 5.4.5 of SABS 1200 MG for rolling of the final coat of aggregate wit

20、h pneumatic-tyred rollers only. In generai, unless otherwise specified in the project specification, steel-tyred rollers, if sed, should be used only on the first coat of the double seal. Where the engineer does require final rolling with a steel-tyred roller, insert a clause such as the following:

21、PSMG 2.1 Fhal rolling (4.42, 4.4.3 and 5.4.5) a) Final rolling shall be done with a flat steel-tyred roller of the type specified in 4.4.3 of 8ABS 1200 MG, working parallel to the centre-line from the shoulders towards the crown of the road until, subject to the provisions of (b) below, every portio

22、n of the area concerned has been covered by at least 2 passes of the roller, or a limited amount of crushing of the aggregate has taken place. b) If, in the opinion of the Engineer, excessive general crushing occurs under the roller, such rolling shall be stopped, regardless of the number of passes

23、completed by the roller. 3.2.3Mass batchling of slurry (5.5.7) Where mass batching of slurry seal is required, a suitable project specification clause should be included, the nominal mix proportions and rate of application of the slurry ordered being specified as in the following example: Nominal co

24、mpo!iition of slurry Slurry seal aggregate 100 parts by mass Stable-mix type emulsion 20 parts by mass Filler 1 part by mass Water as directed Nominal rate of application Nominal size of aggregate Nominal rate of application 19,O mm 10 kg/m2 (total) 13,2 mm 7 kg/m2 3.2.4 initial testing (7.1) Should

25、 the period of 3 weeks specified in 7.1 of SABS 1200 MG be considered inadequate for the testing of samples and the determination of rates of application, extend the period in a suitable project specification clause. 3.3 Prestige proje!cts Include in the project specification, clauses dealing with t

26、hose portions of the works that reqrire special workmanship, tolerances, testing or other action. 3.4 Subeconomic projects 3.4.1 Until a suitable standardized specification has been published, prepare a suitable particular specification. 3.4.2 Consider including PS clauses as indicated for labour-ba

27、sed projects in 3.5. 3.4.3 Consider specifying and scheduling a single surface treatment in terms of 5.6 of SABS l200 MG. - -.p 1) Road tar binders prepared from coke oven crudes. SABS 0120-2 Section MG:1996 Bituminous surface treatment First revision 3.5 Labour-based projects Consider an appropriat

28、e design combined with neutral documentation and neutral specifications. (See “Neutral Specifications“ by A S obinson).) Take the appropriate action set out in 3.4 above and, where a bituminous surface is required, include PS clauses to modify the requirements for plant given in SABS 1200 MG as foll

29、ows: SABS 1200 MG Subclause 4.6 To permit the use of a small concrete mixer for the mixing of slurry seal; 4.7 ) to encourage hand spreading of slurry by means of squeegees; 5.5.8 ) 5.1.1 ) to permit hand brooming; 5.4.3 ) 5.4.2 to encourage the spreading of aggregate by hand, using shovels; 5.4.3 to permit the use of one type of roller only. 2) Published in Development in Southern Africa, Vol. 1, No. 1, Sandton, May 1984. ISBN 0-626-1 0636-2 3 sabs pta