SANS 10120-2 ME-1981 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 2 Project specification Section ME Sub.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 : Part 2 Sect ion ME-1981 Subbase PART 2 : PROJECT SPECIPlCATlON . PORTlON 2 CONTENTS Clause 1 . 2 . 3 . 3.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5

4、3.2.6 3.2.7 3.3 3.4 3.5 Page Number ESSENTIAL PROJECC SPECiFlCATION CLAUSES . 1 RSSENTlAL DATA 1 ADDITIONAL CLAUSES 1 . General 1 . Normal ProjecLs 1 Material suitable for subbase course. gravel shoulder. and gravel wearing . course 1 . Selection of material 1 Processing of material Erom commercial

5、sources 1 Minimum relaLive density 2 . Stabilization 2 Subbase not included in design 2 Testing . 3 Prestige Projects 3 Subeconomic Projects . 3 Labour-Based ProjecLs 3 SARS 0120 : Part 2 Sect ion ME-1981 Subbasc? NOTE a) Number the PSME clauses in Portlon 2 of the project specification in the seque

6、nce in which the clauses to which they relate appear in SAUS 1200 ME. h) The clause numher(s) given at the beginning or after tlw heading of a clause isfare, unless ot11t.r- wise statal, the nuraher(s) of the relevaut clause(s) of SAM 1200 HE. ESSENTIAL PKOJECT SPECIFICATION CLAUSES Set out suitable

7、 clauses in Portion 2 of the project spectfication to provide essential information. as follows: a) (NOTE to Subclause 3.2.l(d) State the regional factor applicable to the area of the works. b) (Subclause 5.3) If the source and type of material are known, state the type of processing required. C) (S

8、UCIISCS 5.4.1 and h. 1.4) State the thicknpss of the layer where suhbase or gravel weartrg course material is to be used for roals, shoulders, footways, and paved areas. ESSENTIAL DATA The availability of certain essential data may affect the prices tendered. Except where such data have been given i

9、n the scltedule or in the tender drawings. set out suitable clauses clwering items such as the following in Portion 2 of the project specif icatinn: a) (Subclause 3.3.1) If applicable and where known, state the stalilizing agent required. h) (Subclause 5.4.1) State the tlrlckness and the width of th

10、e layer. C) (Suhclase 5. S. 1) If a borrow pit is des lgnattd or a cornrnt.rcin1 source is known. state the application rate of the stabilizing agctrt required for the parLLcular material. d) (Subclausc 5.5.3) Specify tlre areas in which hand spreading or the stabil iztng agent is nut acceptable. e)

11、 (Suhclause 8.l(d) When relevant, specify whether additional payment will be made for the class of excnvat ton, the method of processing, and overhaul. ADDITIONAL CLAUSES GENERAL. Where it is necessary to ampllfy or otherwise to vary the terns of SAUS 1200 ME to render them suitable for use Ln proje

12、cts to he carried out in particnlar locations or under particular circmstances, include in Portlon 2 of the project specification clauses dealing with matters other than those covered by Clauses 1 and 2. NOTE: To mer: t requirements imposed by various norms of economic development. projects are clas

13、sified as normal, prestige. subeconomic, and labour-based prnjects (see Section 0 of Part 3 of the code). Material Suitable for Subbase Course. Gravel Shnulder. and GryeWearing CI (Subclauses 3.2.1 and 3.2.2). State the required propertles where they differ from those specified. Selection o_T Materi

14、al (Subclause 3.5.1). Where the engineer so requires he may designate sources of borrow material. Processing of Material from Commercial Sources (Subclause 5.3) Heavy grid rolling- It is a moot point whether tlre material should he windrowed to the side aFter the second series of grid roller passes.

15、 Should the contractor attempt to compact the material in position, oversize material will be hidden by the broken down surface of Lhe layer and it is to prevent this that an additional windrowing may be necessary. The contractors rate covers four passes in terms uf Subclausc 5.3(h)(2) of SABS 1200

16、ME. Where it is likely that more passes will be necessary. set out the details and schedule a suitable item. Crushing. Where necessary. specify a further method of processing (by crushing) in a clause such as the following: PSME 1. CRUSIIING (Subclause 5.3) PSME 1.1 Method. Where ordered and hefore

17、being placed on the road. the material shall be cruslred. Where the material is such that the oversize material can be screened out and is suitable for tire subbase, the oversize material shall be crushed and combined with the screened material. PSME 1.2 Measurement and payment for crusling. The ope

18、rations of crushing and screening and the provision of the necessary plant will be scheduled separately as follows: . a) Crushing Unit: m3 Measurement will conform to tlre principles given in Suhclause 8.1 of SABS 1200 HE except that. where screened-out material only is passed through the crusher, a

19、 proportion, as determined by the Engineer, will be measured under the process of screening under Subclause 8.3.5(a) of SAAS 1200 ME and the remainder under crushing above. No payment will he made under Suhclause 8.3.7(a) of SARS 1200 ME Ear the crushing of oversize material. . b) Crushing plant Uni

20、t: Sum Measurement will he made only for a crushing plant set up specifically to crush material on the order of the Engineer in terms of PSME 1. May 1981 Approved hy the COUNCIL OF THE SOUTH AFRICAN RUREAll 01; STAN1)ARI)S SARS 0120 : Part 2 Section Em-1981 Subbase 3.2.4 3.2.5 3.2.5.1 3.2.5.2 3.2.5.

21、3 3.2.6 MOTE 1) Existing crushers. crushers measured under any other portion OF the Works, commercial crushers, and crushers not removed when no longer required for the purposes set out in PSME 1.1 wlll not qualify for measurement or payment under this item. 2) The rate shall cover the cost of provi

22、ding nnd setting up a crushing plan1 on Site, of subsequenl removal when no longer required. and oT cleaning up the area occupied by such plant. Minimbm Relative Density (Subclause 5.4.4.2). State whether a mi.nimum density other than 9; X of modified AASIITO maximum density in the case of subbase,

23、or other Lhan 93 X of modified AASHTO maximum density in the case of shoulders and wearing course, is required. Slaking of lime. Where lime has to be hauled a Long distance and the use of slaked or part.ally slaked lime could prove economical, include a clause such as: PSME 2 SCABILlZATION PSME 2.1

24、Partially slaked or unslaked lime (Subclause 5.5.4) a) When partially slaked or unslaked lime is used, the Contractor shall inform the Engineer of the manufacturers recommended technique for slaking the lime. b) Unless otherwise approved (see (c) below), the Contractor shall slake the lime (after it

25、 has been spread as specified in Subclause 5.5.3 of SARS 1200 ME) hy keeping it wet until conplete hydration has taken place. (ln the case of uwlaked lime this shall be for at least 36 h.) Slaking shall be completed and the time allowed to dry out before it is mixed with the naterial to be stabilize

26、d. (The line hall not be mixed with this material while the lime is still damp.) The lime shall then be mfxed in, the moisture content adjusted to optimum moisture content, and the layers compacted as specified in Subclause 5.5.4 of SARS 1200 ME. c) As an alternabive to the procedure give in, (b) ab

27、ove. after partial hydration of the lime has taken place and the lime is dry and loose, the Engineer may allow a preliminary mixing of the material to be stabilized with the lime, with the addilion of water, so that the remainder of the slaking period is combined with a preliminary moisture curing p

28、eriod of the material to be stabilized. The layer being stabilized shall be kept mist for 2 to 3 d as required by the Engineer. At the end of this period the material shall be thoroughly mixed and the moisture content adjusted to 1-2 X wet of opLLmum (mod. AASNTO). After a Further 12 h the moisture

29、content shall be adjusted to about l Z dry of optimum (mod. AASHTO) and the layer compacted as specified in Subclause 5.5.4 of SABS 1200 ME. d) The stabilizing agent shall be applied only to an area of such size that all processing. watering, compacting, and finishing can be completed within 48 h. e

30、) The Contractor shall carry out tests to prove that the lime has been properly slaked. The slaking oE the lime shall be deemed to have been completed if in not more than one test per lot or days work carried out in acnrdancewith Suhclause 4.1 of Section ME of Part 3 of the code, a rise in temperatu

31、re of more than 1 C is recorded. Actual stabilizer content where direcL supervision not pracllce (Subclause 7.3.2). Where it may not be practicable for the engineer to control the quantity of stabilizer placed on a road (see Subclause 5.5.3 of SABS 1200 ME) consider including a PS clause such as the

32、 following: PSME 2.2 Actual stabilizer content (Subclauses 5.5.3, 7.3.2 and 8.3.8) a) Notwithstandtng the requirements of Subclause 7.3.2 of SARS 1200 ME. the Engineer may order chemical analyfys to be made of the mixed but uncompacted layer by one of the appropriate methods given jn TMti 1 . h) Whe

33、re the results of at least 18 out of 20 chemical analyses on a selected section indicate a stabilizer content of 60 X or more of the specified content. the Contractor will be paid for the mass of stabihirer computed from the percentage ordered, and for the cost of the tests, and where the results in

34、dicate a stabilizer content of less than 60 X of the specified content. the Con- tractor shall take whatever steps are ordered by the Engineer and the Contractor shall meet the cost of the tests and of such further tests as are ordered. Stahilizatlon by means of bituminous emulsion. Where stahiliaat

35、ion by means of bituminous emulsion is required, include a suitable clause to cover such stebilization. Subbase Not Included in Design (See Subclause 1.2.2 of SARS 1200 MF of part 3 of the code). Take action as set out Pn (a) or (b) below: a) Include SARS l200 ME in the contract and set out a PSME s

36、lbclause drawing attention to this feature of the design and stating hat the provisions of Subclauses 2.3, 3.4, 3.5. 5.2.3, 5.3, 5.4.2, 5.4.3, 5.4.4.1, 5.5, 6.1.2, 6.1.4, 6.1.5, 6.1.6, 7.3, 8.1, 8.3.6, 8.3.7, 8.3.8, and 8.3.9, as relevant, of SABS 1200 ME shall apply to the base; b) Exclude SAW 1200

37、 ME from the contract and set out a series of PSME subclauses that contain such of the requirements of the subclauses of SARS 1200 ME listed in (a) above as are relevant to the base. 1) Standard methods of testinn road consLructlon materials, puhlished by the NlTRR. SARS 0120 : Part 2 Section ME-198

38、1 Subbase 3.2.7 Testing (Subclause 7.2.2, and see 3.2.4 above) 3.2.7.1 Where degrees of compactlon other than those specified in SABS 1200 HE are required.include in the project specification a table such as the following example, to cover the values required: P7 unstabilired I 3 and 4 I 97 I 93.8 S

39、pecified density (X of modified AASHTO maximum density) 97 stabilized of tests per lot 3.2.7.2 If required, specify the statistical acceptance control plan to be used for the evaluation of test results and acceptance of the work. 5 6 3 and 4 5 6 NOTE: Such a control plan should not be used on small

40、urban and industrial road contracts. Minimum average density. Z 97.8 97.9 97.1 97.3 97.5 3.3 PRESTIGE PROJECTS. Include in the project specification clauses dealing with those portions of the works that require special workmanship, tolerances, testing, or other action such as in the following exampl

41、e: Xinimum density for any single Lest. % Plant-Mixed Caver-Laid Subbase. Where a plant-mixed paver-laid subbase. such as for concrete pave- ments, is required. consider including in the contract document Section 3800 of the Standard Specifi- cations for Road and Bridge Works issued by the National

42、Transport Commission. Directorate of Land Transport, Pretoria. as a particular specification, supported by suitable project specification clauses to cover the cross references in the said section to other sections that are not included in the contract document. 3.4 SUBECONOMIC PROJECTS. Use SABS 120

43、0 MA) when appropriate. and state the subclauses of SABS 1200 MA*) that will not be applicable to the project (see Subclause 3.3 of Section MA). 3.5 LABOUR-BASED PROJECTS. Until SABS 1200 K3) has been published, use SABS 1200 MA) when appropriate, and state the subclauses of SABS 1200 M2) that will nut be applicable to the project (see Subclause 3.4 of Section W). -W- 2) Roads (small works). 3) Subgrade (labour-based projects).