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Table 7 Cost analysis of DBM with RAP aggregates

From: Mechanical evaluation of recycled aggregate mixes and its application in reclaimed asphalt pavement (RAP) stretch

Analysis for recycling of Bituminous pavement by Milling (DBM) (below 80 mm)

S. no.

Description of items

Unit

Qty

Rate

Amount

 

MORT&H specification

    
 

Recycling—of Bituminous Pavement with Central recycling Plant

    
 

Recycling pavement by cold milling of existing bituminous layers, planning the surface after cold milling, reclaiming excavated material to the extent of 30% to the required quantity, hauling and stockpiling the reclaimed material near the central recycling plant after carrying out necessary checks and evaluation, adding fresh material including mixing

    
 

Unit = cum

    
 

Taking output-120 cum (276 Tonne)

    

(A)

Labour

    
 

Mate

Day

0.48

585.00

280.80

 

Mazdoor skilled

Day

2.00

585.00

1170.00

 

Mazdoor

Day

10.00

585.00

5850.00

 

(A) Total

   

7300.80

(B)

Machinery

    

1

Mechanical broom @ 1250 sqm hour

Hour

1.28

310.50

397.44

2

Air compressor 250cfm

Hour

1.28

337.50

432.00

3

Bitumen pressure distributor @1750sqm per hour

Hour

0.91

934.20

850.12

4

Hot mix plant 100-120TPH producing an average of 75 tonne per hour

Hour

3.00

15,075.45

45,226.35

5

Electric generator set 250 KVA

Hour

3.00

1350.00

4050.00

6

Front end loader 1.00 cum bucket capacity

Hour

3.00

702.00

2106.00

7

Tipper 5.5 cum capacity

Hour

18.00

270/2

2430

8

Smooth wheeled roller 8–10 tonne

Hour

3.00 × 0.65*

400.95

781.85

9

Vibratory roller 8 tonne

Hour

3.00 × 0.65*

1341.90

2616.71

10

Smooth wheeled tandem roller 6–8 tonne

Hour

3.00 × 0.65*

400.95

781.85

 

(B) Total

   

59672.32

(C)

Material

    

I

Bitumen

    
 

A bitumen content is 4.5% by weight of mix. For reclaimed material, fresh bitumen will be required to the extent of 60% of normal requirement

    
 

In a mix of 276 tonne, 82.8 tonne is reclaimed and balance 193.2 tonne is fresh mix

    
 

Bitumen VG-30 required for reclaimed mix of 82.8 tonne @ 60 per cent = 82.8 × 0.60 × 0.045 = 2.24

Tonne

2.24

53,983.00

120,921.92

 

Bitumen VG-30 required for fresh mix of 193.2 tonnes = 193.2 × 0.045 = 8.69

Tonne

8.69

53,983.00

469,112.27

II

Aggregates

    
 

Percentage of mix requiring fresh aggregates—70%

    
 

Weight of fresh mix = 276 × 0.70 = 19.2 tonne

    
 

Weight of fresh aggregate in the mix = 193.2 × 0.96 = 185.47 tonne

    
 

Taking average density of 1.6 tonne/cum, total volume of Aggregate = 115.92 cum

    
 

Size-wise requirement of fresh aggregates

    
 

37.5–25 mm @ 23%

cum

26.66

856.13

22,824.43

 

25–10 mm @ 15%

cum

17.39

856.13

14,888.10

 

10–5 mm @ 20%

cum

23.18

856.13

19,845.09

 

Below 5 mm @ 42%

cum

48.69

776.13

37,789.77

 

 (C) Total

   

685381.58

 

 (A+B+C)

   

752354.70

(D)

5% over charges @ % on (a + b + c)

   

37,617.74

 

 (D) Total

   

789972.44

(E)

10% contractor’s profit@ % on (a + b + d) on Rs

104,590.86

  

10459.09

 

Cost for 120 cum of DBM = (a + b + c + d + e) = Grand Total

  

G. Total

800432

 

Rate per sqm = (a + b + c + d + e)/120

   

6670.26

 

 Say Rs.

 

6670.30

/- P.cum

 

(F)

Cost of reclaimed DBM per km

23,34,605

Per km

 Â