SANS 10120-2 MF-1981 Code of practice for use with standardized specifications for civil engineering construction and contract documents Part 2 Project specification Section MF Bas.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

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 W- l98 1 Base PART 2 : PROJECT SPECIFICK1ION, PORTION 2 SECTION MF CONTENTS Clause Page Number . ESSENTIAL PROJECT SPECIFICAT

4、ION CLAUSES I ESSENTIAL DATA I ADDITIONAL CLAUSES I General . I . Normal Projects I Physical properties of natural gravels I compaction I Gravel shoulders 2 Junctions with existing work 2 Tolerance on completed surface 2 Moisture content and density 2 Acceptance control by statistical analysis 2 . D

5、esignated borrow pit with excessive overburden 2 . Prestige Projects 2 Subeconomic Projects 2 SABS 0120 : Part 2 Section MF-1981 Base SABS 1200 MF : BASE NOTE a) Number the PSMF c lauses in Port :ion in the sequence in which the ion 2 of the project specificat clauses to which they relate appear in

6、SABS l200 MF. b) The clause number(s) given at the beginning or after the heading of a clause is/are, unless other- wise stated. the number(s) of the relevant clause(s) of SABS 1200 MF. ESSENTIAL PROJECT SPECIFICATION CLAUSISS Set out suitable clauses in Portion 2 of the project specification to pro

7、vide essential information. as f ol lows : a) (Subclase 5.4) State the type of base required (i.e. gravel or graded crushed stone (with or without fines) unless the type is at the option of the contractor. b) Where SABS 1200 ME does not form part OF the contract document, take action as set out in S

8、ubclause 1.2.2 of Section MF of Part 3 of the code. ESSENTIAL DATA The availability of certain essential data may affect the prices tendered. Except where such data have been given in the schedule or in the tender drawings, set out suitable clauses covering items such as the following in Portion 2 o

9、f the project specification: a) State the thickness required, and, when relevant, the number of layers. b) (Subclause 5.6) Schedule the base as waterbound macadam or describe it as such on the drawings, if required. c) Where a degree of compaction or a compaction standard different from that given i

10、n Subclause 5.4.4.2 of SABS 1200 MF is required, state the degree of compaction or compaction standard. d) (Subclause 3.3.5) Where the filler for waterbound macadam is a cohesionless sand it may be necessary to add cement, slaked lime, or other suitable fine material to the final layer of filler to

11、provide a well bound firm surEace for the waterbound macadam base. so that the coarse aggregate will not be displaced under construction traffic when priming or surfacing is being done. e) (Subclause 3.5) Where the use oE sea water is likely to be the most economical and its use is acceptable, say s

12、o in a suitable clause. ADDITIONAL CLAUSES GENERAL. Where it is necessary to amplify or otherwise to vary the terms of SABS 1200 MF to render them suitable for use in projects to be carried out in particular locations or under particular circrmstances. incltde in Portion 2 of the project specificati

13、on clauses dealing with matters other than those covered by Clauses 1 and 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 Section 0 of Part 3 of the code). Physica

14、l Properties of Natural Gravels (Subclause 3.3.1). Where necessary (e.g. to avoid the expense of importation) the grading limits and other physical properties required may be varied by means of a suitable PS clause. Compaction (Subclause 5.4.4) Compaction measured as a percentage of solid density. T

15、he compaction of a graded crushed stone base is usually specified as a percentage of solid density. Where such a base is specified or the compaction is required to be specified in terms of a percentage OF solid density, insert a project specification clause such as the Following: PSMF 1. COMPACTION

16、PSMF 1.1 Compaction as a percentage OF solid deusity (Subclause 5.4.4.2). In lieu of compactlon to at least 98 % and 97 % of modified AASHPO maximum density for natural and stabilized materials respectively, the base shall he compacted to at least 88 X* and 86 X* of solid density for natural and sta

17、bilized materials respectively. * Actual value to be selected by the engineer. PSMF 1.2 Rout tne testing of densLty- (Subclause 7.3). Notwithstanding the provisions of Subclause 7.3.2 of SABS 1200 MF, should the minimum average and minimum densities of a lot, expressed as a percentage of solid densi

18、ty, equal or exceed the applicable values given in Table 1, the lot shall he deemed to comply with the density requirements of the specification. TABLE 1 - DENSITY OF BASE 88 (unstabilized) I 4 I 88.5 I 84.9 5 88.7 84.7 2 Number oE (X of solid density) tests per lot - May 1981 Approved by the COUNCI

19、L OF Tllli: SOUTII AFRICAN BUREAU OF STANDARDS 3 Minimum average density, X 86 (S tahi l Lzed) -1; 4 Minimum density for any single test, I -p 88.8 86.5 86.7 86.8 84.6 82.9 82.8 82.7 SABS 0120 : Part 2 Sec tion MF-198 1 Base 3.2.2.2 3.2.3 3.2.3.1 3.2.3.2 3.2.4 3.2.4.1 3.2.4.2 3.2.5 3.2.6 3.2.7 3.2.8

20、 3.3 3.4 Special requirements tor compaction. Note that compaction to 100 % modified AAStfTO maximrtm density is required by the Port Elizabeth City Council and is in fact obtainable in the area. Gravel Shoulders (Subclause 5.4.2) Where shoulders are to be constructed and are of the same material as

21、 that of the base, imsert a suitable clause requiring that they he constructed at the same time as the base. Where the shoulders are of a different material from that of the base, insert a suitable clause requiring that they be constructed before the base, drawing attention to the need to so program

22、 the operation that drainage problems do not arise, and placing the responsibility on the contractor to meet the cost of rectification if drainage problems do arise. Junctions with Existing Work (Subclause 5.7) Where the contract covers the widening of an existing road, the contractor can be expecte

23、d to evaluate the cost of dealing with the junction between old and new work in terms of Subclause 5.7 of SAW 1200 MF and to include such cost in his rate for the base. Where a large number of intersections with existing roads are involved and where it is not clear at the tender stage whether the ju

24、nctions will be required at the wide or at the narrow ends of aellmouths. schedule a separate item for such junctions, measured by length, and set out a suitable clause specifying the circumstances under which payment will, be made for the item. Tolerance on Completed Surface (Subclause 6.1.2). In t

25、he case of all Pretoria and Johanlesburg roads -p- that are provided with kerbs and channels, set out a suitable clause that refers: the tolerance specified for the base to a level 30 mm (the thickness of premix required) below the level of the channel. Moisture Content and Density (Subclause 6.3).

26、Specify the degree of accuracy required or the permissible deviations that will be accepted if Degree of Accuracy TI is not acceptable. Acceptance Control by Statistical Analysis (Subclause 7.1). (See Subclause 6.1 of SABS 1200 M and - Subclause 2.3 of Section M of Part 3 of the code.) Where accepta

27、nce in accordance with a statistical control plan is required set out the details in a suitable clause. Designated Borrow Pit with Excessive Overburden (Subclause 8.3.10). Where the quantity of overburden is excessive or difficult for the contractor to forecast reliably, consider the economic advant

28、ages of scheduling the handling of overburden separately. In such circumstances, set out the requirements in a suitable clawse and schedule an item for dealing with overburden. PRESTIGE PROJECTS. Not applicable. SUBECONOMIC PROJECTS. The requirements of SABS 1200 MF are suitable for those roads of subeconomic projects that are to be bitumen surfaced but may set standards that are too high for other roads covered by such projects.