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COST ANALYSIS OFCONCRETE ROADS INMUMBAI
PRESENTED BY,ALOK KUMAR SINGHROLL NO:-08CE-(A)
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Roads are important part of any city. Unlessthey are in healthy condition, the citycannot function properly.
This paper highlights benefits of cement
concrete roads and presents a life-cyclecost analysis based on experience ofworking in Mumbai city.
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The original island of Mumbai was only 24
km long and 4 km wide from Dongri toMalabar Hill.
Due to low maintenance cost and other
advantages Municipal Corporation ofGreater Mumbai and Mumbai MetropolitanRegion Development Authority have plans
for concertizing the entire major roadnetwork in the Mumbai Metropolitan area.
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The total road length in Mumbai is about2000 KM, comprising of 1950 km of BMCmaintained roads and 50 km of statehighways.
The first concrete road in Mumbai was MarineDrive constructed in the year 1939.
These roads are of two kinds, namely1.Rigid pavements.
2.Flexible pavements. Here we determine the cost analysis for these two
types of roads.
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STABILISED
SOIL
6%
GSB
17%
WMM
15%TACK COAT
3%
ASPHALT
MACADAM
21%
DENSE
BITUMEN
MACADAM
21%
ASPHALT
CONCRETE
17%
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Stabilized soil 200 mm =Rs 100 per sqm
GSB 250 mm (2 layers )=Rs 300 per sqm
WMM 225 mm =Rs 260 per sqm
Tack coat (3 times)=Rs 62 per sqm
Asphalt macadam (75 mm)=Rs 375 per sqmDense bitumen macadam 50m=Rs 375per sqm
Asphalt concrete (40 mm)=Rs 313 per sqm
Total =Rs 1770 per sqm
The cost of above 3.75 m wide pavement willthus be about Rs. 66 Lacks per km
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GSB
9%WMM
8%DRY LEAN
CONCRETE
M-10
22%
CONCRETEOF M-40
GRADE
61%
Sales
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GSB 200 Mm thick (2 layers)=Rs 233 per sqm WMM 150 mm =Rs. 200 per sqm
Dry lean concreteM-10(150 mm)=Rs.590per sqm
Concrete of M 40 Grade 300=Rs.1587per sqm
Total=Rs. 2610 per sqm
The cost of above Pavement will thus be aboutRs.98 lakhs per km for 3.75 m wide.
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Cost estimate
Initial cost of flexible pavement=Rs. 66 lakhs/Km Initial cost of rigid pavement=Rs. 98 lakhs/km Initial cost of rigid pavement using 30 % fly ash for
replacing of cement=Rs. 91 lakhs/km Annual maintenance cost for flexible pavement
=Rs. 0.25 lakhs/km Renewal of wearing course of flexible pavementevery 5 years=Rs. 12.00 lakhs/km
Strengthening of road every 10 and 20 years =Rs.14.00 lakhs/ km
Renewal of wearing course of flexible pavementevery 5,10,15 and 20 years,= Rs. 12.00 lakhs/km Total = Rs. 26 lakhs
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Flexible pavementYEAR
CONSTRUCTIONCOST
MAINTENANCECOST
NPV(1/1.10)
0 66 - 66.00
1 - .25 .23
2 - .26 .21
3 - .27 .20
4 - .28 .19
5 - 15.32 .20
6 - .31 9.51
7 - .33 .17
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8 - .35 .169 - .37 .16
10 - 42.35 16.33
11 - .41 .1412 - .43 .14
13 - .45 .13
14 - .47 .12
15 - 24.95 5.97
16 - .52 .11
17 - .55 .11
18 - .58 .10
19 - .61 10
20 - 68.99 10.25
TOTALNPV COST
110.50
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YEARCONSTRUCTIONCOST
MAINTENANCECOST
NPV(1/1.10)
0 98.00 - 98.00
1 - .1 .09
2 - .11 .09
3 - .12 .09
4 - .13 .09
5 - .14 .09
6 - .15 .08
7 - .16 .08
8 - .17 .089 - .18 .07
10 - .19 .07
11 - .20 .07
RIGID PAVEMENT
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12 - .22 .0713 - .23 .06
14 - .24 .06
15 - .25 .06
16 - .26 .05
17 - .27 .05
18 - .28 .05
19 - .29 .05
20 - .30 .04
99.40
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Saves fuel Long life
Gain in traffic speed
Resistant to weather and oil spills Economical
Environmental friendly
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Initially cost of construction is veryhigh.
However ,with the price of bitumen
going up steadily, and the use of flyash in making concrete mixes forpavements the relative cost of these
two types of pavements could becomequiet comparable.
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Based on the above life cycle cost analysis,Net Present Value (NPV) of flexiblepavement will be about 1.17 % higher thanthe rigid pavement after 20 years.
Life of concrete pavement will be more than40 years, hence concrete pavement willfurther serve for another 20 years with
nominal maintenance.
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THANK YOU!