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Chapter-'S
Bases and Surface Course (Bituminous)
Preamble:
1. Various alternatives for machines and materials have been provided. The one that suits a particular situation and design may be adopted.
2. The Clauses of MoRT&H Specifieatlons, which have been mentioned tor each item, may be referred tor detailed specifications and construclion procedure. The rate analyses mention. only brief description.
3. The machinery and equipment included in various analysis are as per various specifieatlons of MoRT&H and are mandatory. As perthe present trend,contraetors areprocuring machinery and equipment of higher capacily. Provision has accordingly been made.
4. The outputs· taken for the construclion equipment are
tor
the compacted quantities of the relevant items and not for loose quantities.5. In case of prime coat and tack coat, minimum quantities of binder indicated in specifications have been taken. Adjustment, plus or minus, can be made tor the variation between this quanlily and the actual quanlily approved by the EngineeraflertheprelirTiinarytrials.
6. The items of bituminous works required under maintenance have been added in the Chapter on Maintenance.
7. Tack coat and prime coat, wherever provided, are required to be measured and paid separately.
8. Cleaning of surface is a part of the prime coat and tack coat. As such cleaning of surface has not been provided tor bituminous courses as the same is already catered inprimeJtack coat. However, tor those cases where such coats are not required to be done, cleaning of surface shall be included.
9. It is presumed that tack coat, where required, will be provided immediately preceding the bituminous layer.
10. Rolling of bituminous courses is required to be done as per Clause 501.6. Provision in the analyses has accordingly been made. It has been observed during actual praclice at work sites, that the availabilily of road roller is generally inadequate. As compaclion is the key to good construction, this point is being specifically highlighted to ensure that road rollers are deployed at site as per provision in the rate analyses.
11. Spreading of bituminous materials shall be done by mechanical means except in areas where a mechanical paver cannot have access.
12. The source of all materials to be used on the project must be tested and expressly approved by the Engineer.
121
Road Works: 5-Bases and Surface Course (Bituminous)
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13. Quantities of materials taken in the analyses are for the purpose of cost estimate only. The'.a4
quantity shall be as per job mix formula. . . "'.
14. Choice of grade of bitumen shall be made as per the gUidelines given in Appendix-4 of MoRT&r.
Specifications.
15. The specification and requirements for modified binder with various type of modifiers have been laic
4 4
down in Clause 521 of MoRT&H Specifications and IRC: SP:53-2002 which shall be followed.
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16. The guidelines given vide Annexure - A to Clause 501 of MoRT&H Specifications in regan! to protection .
of environment shall be followed for a particular situation.. •
17. The quantities taken as output of the it\lm in the rate analysis are the compacted quantities and the • quantities of aggregates taken under the head 'material'are the un-eompacted quantities for the • procurement purposes.
•
18. The approximate proportions by weigtlt of different aggregates and bitumen Corby Volume in unavoidable • cases) necessary to produce the intended mix satisfying the job requirements and meeting the designated Specifications are for estimating purpose only .. The actual quantities should be worked out.
on the basis of job mix formula adopted for the job. after working out the same in the laboratory for
particular aggregates and bitumen approved by the Engineer. •
122
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Sr.
No.
5.1.
Chapter- 5
Bases and Surface Course (Bituminous)
Reference to MoRT&H Specifications
502
Description
Prime coat
Providing and applying primer' coat with bitumen emulsion on prepared sUrfa,ce of granular base including clearing of road surface and spraying primeratlhe' rate of 0.60 kg!
sqm using mechanical means.
Unit"'sqm
Taking output'" 3500 sqm
a) Labour
Male
Mazdoor
b) Machinery
Mechanical broom @1250 sqrn per hour Air compressor 250 cfm
Bitumen pressure distributor @1750 sqm perhour
water lanker 6 KL capacity @1 trip per hour
c) Material
Bitumen emulsion @0.6 kg per sqm Cost of water
d) Overhead charges @ % on (a+b+c) e) Contractor's profit @ % on (a+b+c+d) Cost for 3500 sqm '" a+b+c+d+e
Rate per sqm
=
(a+b+c+d+e)/3500123
Unit
day day
Quantity Rate Rs.
-0.08 2.00
hour 2.80
hour 2.80
hour 2.00
hour 1.00
.'
j
tonne 2.10 ,.
KJ.. 6.00 \,
I
,jReference to MoRT&H Specifications
Note:
503
1Ir'_---Rood Wodcs: S-Bases and Surface cowse (Bituminous)
Description Unit
Bitumen primer has been proVided @0.60kg per sqm as per Clause 502.8. Payment shall be made with adjustmen~' plus or minus, for the variation between this quantity and the actual quantity approved by the Engineer alter the preliminary trials refe~ to in Clause No.
502.4.3.
Tack Coat
Providing and applying lack coat With bitumen emulsion using emulsion pressure distributor at the rate of 0.20 kg per sqm on the prepared bituminous/granular surface cleaned with mechanica, broom.
Unit =sqm
Taking output=3500 sqm a) Labour
Mate day
Mazdoor day
b) MaChinery
Mechanical broom @ 1250 sqm per hour hour
Air compressor 250 cfm hour
Emulsion pressure distributor hour
@1750sqmperhour
c) Material
Bitumen emulsion @ 0.2 kg per sql"(! tonne
d) Overhead charges @ % on (a+b+c)
e) Contractor's profit @ %on (a+b+c+d) Cost for 3500 sqm =a+b+c+d+e
Rate per sqm •• (a+b+c+d+e)/3500
124
{' (' ('
Rood W(lIks: 5-Bases and Surface Course (Bituminous)
-Refercence to Description Unit Quantity Rate
MoRT&H Rs.
Specifications
Note: 1. Bitumen emulsion has been provided
@ 0.20 kg per sqm as per Clause 503.8.
Payment shall be made with adjustment, pius or minus, for the variation between this quantity and actual quantity approved by the Engineer after preliminary trials referred to in Clause 503.4.3.
2. An output of 3500 sqm has been considered in case of prime coat and tack coat which can be covered by bituminous -courses on the same day.
504 -SltuminousMacadam
Providing and l<1yingbituminous ma<:adamwith 100-120 TPH hot mix plant producing an average output of 75 tonnes per hour using crushed aggregates of specified grading
premixed with bituminous binder, transported 10site, laid over a previously prepared surface with paver finisher to the required grade; level and aJignmenl.and rolled as per Clauses 501.6 and501.710 achieve the desired compaction Unit
=
cumTaking output
=
205cum(450tonne)a) Labour
Mate day 0.84
Madoorworkingwith HMP, mechanical dqy 16.00 broom, paver, roller, asphalt culler and
assistance for selling out lines, levels and layout of construction
Skilled mazdoor for checking line and day 5.00 levels
125
Road Worb: 5-1lases and Surface Course (Bituminous) .~
I
Sr.
No.
Reference to MoRT&H Specifications
Description
Unit Quantity •.
b) Machinery
i
Batch mix HMP 100-120 TPH @75tonne hour 6.00 ;
..
per hour actual output
A
Mechanicalbroom hydraulic@ 1250 sqm hour 2..20 per hour
Air compressor 250 cfm
4
hour 2.20
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Paver finisher hydrostalic with sensor hour 6.00
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control @ 75 cum per hour Generator25O KVA
hour 6.00
'.
Front end loader 1 Cum bucket capacity hour 6.00
':,4
Tipper.10 tonne capacity t.km 450 x l
Add 10 per cent of cost of carriage to
:~
cover cost of loading and unloading
'-41
Smooth wheeled roller 8-1 0 tonnes for hour 6.00 x 0.65·
41
inilialbreak down rolling
t
Vibratory roller 8 tonnes for intermediate hour 6.00' x 0.6$·
rolling
t
Fipish rolling with 6-8 tonnes smooth hour 6.00 x 0.65· 411 wheeled tandem roller
~t
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c) Material
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I) Bitumen @ 3.3 per cent of mix tonne 14.85
Weight of mix =205 x 2.2 =450 tonne
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ii) Aggregate
,
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Total weight of mix=450 tonnes
,
Weight of bitumen =14.85 tonnes•
Weight of aggregate =450 -14.85
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=435.15 tonne.s
Taking density of aggregate =1.5 ton/cum
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Volume of aggregate =290.1 cum
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"Grading I (40 mm nominal size)
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37.5-25mm 15 percent cum 43.51
25-1010-5 mmmm 25 percent45 percent cumcum 130.5572.53
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5 mm and below 15 per cent : cum 43.51
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sr.
No.
Reference to MoRT&H Specifications
"Note:
Road Works: S-B •••• and SurfaceCOUJSO(Biblminous)
Description
(19 mm nominal size) 40percent 40 percent 20 percent Grading II
25-10mm 10·5mm
5 mm and below
'Any one of the altemative may be adopted as per approved design
d) Overhead charges@ %on (a+b+c) e) Contractor's profit@ % on (a+b+c+d) Cost for 205 cum =a+b+c+d+e
Rate per cum
=
(a+b+c+d+ll')/20S'1. Although the roller are required only .for 3 .hours as per norms of output, but the same have to be available at site for six hours as the hot mix plant and paver will take six hours for mixing and paving the output cif 450 tonnes considered in this analysis.
Tocaterfor·the idle period of this rollers, their usage rates have been multiplied by a factor of 0.65.
2. Quantity of bitumen has been taken for analysis purpose. The actual quantity wm depend upon job mix formula.
3. Labour for traffic control, watch and ward and other miscellaneous duties at site including sundries have been included in administrative overheads of the Contractor.
4. In case 8M Is laid over freshly laid tack coat, provision of mechanical broom and 2 mazdoors for the same shall be deieted as the same has been included in the cost of tack coal
127