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Dense Bituminous Macadam (DBM) or Bituminous Concrete (BC) layer Quantity / Compaction Factor value / Loose thickness calculation


Dense Bituminous  Macadam (DBM) or   Bituminous Concrete (BC)  quantity / Compaction Factor value for DBM or BC / Loose thickness of DBM or BC Layer 

In this article we shall discuss three important points about Dense Bituminous   Macadam (DBM) or Bituminous Concrete (BC)

1- How can we calculate the required DBM/BC quantity? 

2 -  What is value of compaction factor for DBM/BC?

3- How much loose thickness should be taken to get proper compacted layer thickness ? 



1- How can we calculate the required DBM/BC quantity?



Let us consider

Length of  DBM/BC layer (L) = 1 Km = 1000 Met.
Breadth of DBM/BC Layer (B)= 5 Met.
Thickness of DBM/BC Layer (T)  = 50 mm =0.050 Met.

Max. Dry Density (MDD) =2.441 Gram/ Cubic Centimeter = 2441KG/ Cubic metre

Note -  The value of MDD is calculated by conducting suitable test .

Then
Volume of DBM/BC Layer = ( Length of DBM/BC layer X Width of DBM/BC layer  X Thickness of DBM/BC Layer)

Volume of DBM/BC Layer = L X B X T Volume of DBM/BC Layer  = 1000 X 5 X 0.050
Volume of DBM/BC Layer    = 250 Cubic Metre

We Know That
Mass = Volume X Density
in this case -

Mass = Volume X MDD

Putting the value in the above Formula

Mass = 250 X 2441 Kg
Mass  = 6,10,250 Kg

To convert above quantity in Tonn
We Know That

1 Tonn = 1000 Kg
Then

Mass =(610250/ 1000) Tonn
Mass   = 610.250 Tonn


Hence required DBM/BC quantity is 610.25 Tonn. 




2 -  What is value of compaction factor for DBM/BC?

Density of Blended aggregate = 1.60 gram/cc  to 2.0 gram/cc
                  = 1600 - 2000 KG/ cubic metre

In this case
Let us consider

Density of Blended aggregate = 1.80 gram/cc = 1800 Kg / cubic metre

Value of Max. Dry Density (MDD) = 2.441 gram/cc = 2441 Kg/cubic metre

Compaction Factor = (Max.Dry Density/Density of Blended Aggregate )

        =2.441/ 1.80
        =1.3561= 1.36
Hence compaction factor = 1.36

3- How much loose thickness should be taken to get proper compacted layer thickness ? 

Compaction factor = 1.36
Thickness of DBM/BC Layer  = 50 mm

Hence

 Loose thickness of DBM/BC Layer = ( Compacted layer thickness X Compaction Factor )
 = 50 X 1.36
 =68 mm

Hence Loose Thickness of DBM/BC Layer is 68 mm. 

Thanks a lot 
Mukesh Kumar
 Gyan of engineering 


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Comments

  1. Mahesh S20 May 2020 at 10:19

    Thankyou .. Kudos for your blog. Keep going with your good work.

    ReplyDelete
  2. Er. Sajal Biswas6 January 2021 at 08:40

    Very informative. Appreciable practical knowledge.

    ReplyDelete
  3. Unknown14 February 2021 at 07:28

    Very good information sir. If you have you tube chanel please tell me address it.

    ReplyDelete
    Replies
    1. Unknown21 February 2021 at 08:19

      Very informative, sir I have a question while cross checking the quantity of survey with dumper trips, there are always arguments that loose quantity from plant needs to be same as compacted thickness. They say loose quantity before mixing only and after mixing only 10% air voids as per contractor arguments.

      Delete
  4. Unknown3 November 2021 at 09:26

    Actual quantity required is (610.250*1.36) = 829.94 tonne

    ReplyDelete
  5. Unknown6 March 2022 at 16:58

    So As per the above mentioned calculation we need to order 829.94 ton for 50 mm compacted thikness of 1km Rd having 5 mtr width ?
    Bcoz 610.250 is compacted volume not loose
    So , 610.250 * 1.36 = 829.94 ton

    ReplyDelete
    Replies
    1. Anonymous16 December 2023 at 17:53

      The Quantity we have to order w.r.t LBD and MDD, So for the above measurements the Quantity is 610.250MT(Compacted) and for the same quantity we have to execute by maintaining Loose Thickness 68mm to achieve 50mm Compacted Thickness.

      Delete
    2. Anonymous23 August 2024 at 19:14

      i have learnt something. thanks very much

      Delete
  6. Anonymous30 January 2023 at 15:13

    Thanks

    ReplyDelete
  7. Anonymous29 October 2023 at 09:22

    Thanks for the information

    ReplyDelete
  8. Anonymous16 November 2023 at 18:49

    Wrong calculation 610 tones dbm with 50mm compaction thicks

    Required dbm is actually 567 tones.u wasted 43 tones oh no
    No idea how to calculate

    ReplyDelete
  9. Rvtcad28 May 2024 at 16:28

    Rvtcad offers precise As-Built Drawing Services using Point Cloud technology. Our method ensures accurate representations of existing structures, aiding in renovations and design planning—Trust Rvtcad for reliable and detailed As-Built drawings that streamline your projects.

    ReplyDelete

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