alok kumar singh cost analysis

8/2/2019 Alok Kumar Singh Cost Analysis

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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!

alok kumar singh cost analysis

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