Skip to main content

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 


Labels:

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

Post a Comment

Popular posts from this blog

Granular Sub-base Base (GSB) quantity / Compaction Factor value and / Loose thickness of GSB Layer

In this article we shall discuss three important points about granular sub base  (GSB) 1- How can we calculate the required GSB  quantity?  2 -  What is value of compaction factor for GSB? 3- How much loose thickness of GSB should be taken to get proper compacted layer thickness ?  1- How can we calculate the required GSB quantity? Let us consider Length of GSB bed (L) = 500 Met. Breadth of GSB bed (B) = 7 Met. Thickness of GSB Layer (T)  = 150 mm =0.150 Met. Max. Dry Density (MDD) =2.221 Gram/ Cubic Centimeter = 2221Kg/ Cubic metre Note  -  The value of MDD is calculated by conducting proctor density test as per IS 2720 (part -28) : 1983 (Reaffirmed - May 2015). Then Volume of GSB  Layer = ( Length of GSB Bed X Width of GSB Bed X Thickness of GSB Layer) Volume of GSB  Layer = L X B X T  Volume of GSB  Layer   = 500 X 7 X 0.150  Volume of GSB Layer    = 525 Cubic Metre We Know That Mass = Volume X Density in this case - Mass = Volume X MDD Putting
16 comments
Read more

WMM(Wet Mix Macadam) quantity / Compaction Factor value for WMM / Loose thickness of WMM Layer

Wet Mix Macadam (WMM) quantity / Compaction Factor value for WMM / Loose thickness of WMM Layer  In this article we shall discuss three important points about wet Mix Macadam (WMM) 1- How can we calculate the required WMM  quantity?  2 -  What is value of compaction factor for WMM? 3- How much loose thickness should be taken to get proper compacted layer thickness ?  1- How can we calculate the required WMM quantity? Let us consider Length of WMM Bed(L) = 1 Km = 1000 Met. Breadth of WMM Bed(B)= 7 Met. Thickness of WMM Layer (T)  = 150 mm =0.150 Met. Max. Dry Density (MDD) =2.230 Gram/ Cubic Centimeter = 2230KG/ Cubic metre Note -  The value of MDD is calculated by conducting proctor density test as per IS 2720 (part -28) : 1983 (Reaffirmed - May 2015). Then Volume of WMM Layer = ( Length of WMM Bed X Width of WMM Bed X Thickness of WMM Layer) Volume of WMM Layer = L X B X T  Volume of WMM Layer   = 1000 X 7 X 0.150  Volume of WMM Layer    = 1050 C
6 comments
Read more

Granular Sub base (GSB) specifications, GSB Grading, layer thickness, Water absorption, Physical requirements (like liquid limit, Plasticity index ,AIV), construction procedure or Rolling , measurement and treatment of GSB as per MORTH 5th revision and Indian standard in Civil engineering

Granular sub-base (GSB) SUB BASE (GSB)– The full form of GSB is granular sub base.it is being laid in road work because it plays two major roles 1- it works as  drainage layer 2- it provides a good sub base to laid base layer on it. How to calculate the quantity, compaction factor value and loose thickness of GSB? To know more information kindly visit on below link 🔗  Granular sub-base(GSB) Quantity,compaction factor and loose thickness Material –     The material to be used for the work shall be natural sand, crushed   gravel, crushed stone, crushed slag, or combination thereof depending upon the grading required use of material like brick metal, kankar and crushed concrete shall be permitted in the lower sub base. The material shall be free from organic or other deleterious constituents. Grading III and IV shall be used in lower sub base. Grading V and VI shall be used as sub-base-cum-drainage layer. Where the sub-base is laid in two layers as upper sub-base an
6 comments
Read more

Wet Mix Macadam (WMM) technical specifications as per MORTH and Indian standard in Civil engineering

WET MIX MACADAM (WMM) sub – base /base:- Wet mix macadam (WMM) act as a base course just below the bituminous layer (bitumen base course or surface course).  The thickness of a single compacted Wet mix macadam(WMM)  layer shall not be less than 75mm.when vibrating or other approved types of compacting equipment are used, the compacted depth of a single layer of the sub-base course may be up to 200mm. How to calculate the loose thickness of WMM, compaction factor and quantity of WMM ? Kindly visit on below link 🔗 WMM- loose thickness,quantity and compaction factor Physical requirements   Material finer than 425 micron shall have plasticity index (PI) not exceeding 6. To determine this combined portion, the flaky stone from a representative sample should first be separated out. Flakiness index is weight of flaky stone metal divided by weight of stone sample. Only the elongated particles are separated out from the remaining (non-flaky) stone metal. E
5 comments
Read more

DBM (Dense Bituminous Macadam) specificatins,layer thickness, physical requirements, aggregate size, grades and its measurements

 DENSE BITUMINOUS MACADAM(DBM) DBM acts as a bituminous  base course and thickness of a single compacted  layer shall be 50 mm to 100 mm.  In this article we shall discuss about Technical specifications of DBM (Dense Bituminous Macadam), layer thickness, physical requirements, aggregate size, grades and its measurements A-Scope : The work shall consist of construction in a single layer of DBM on a previously prepared base or sub-base. The thickness of a single layer shall be 50 mm to 100 mm. B - Material : The choice of binder material shall be stipulated in the contract or by the engineer, where viscosity grades of bitumen are specified, they are referred to by a designation in accordance with IS: 73. Where modified bitumen is specified, it shall conform to the requirements of IRC:SP:53 and IS:15462. Selection criteria for viscosity grade bitumen based on highest and lowest daily mean temperatures at a particular site are ]given in table no -1. 1-Coarse Agg
4 comments
Read more

Full form of various terms used in civil engineering /highway engineering or road work

Full Form of various  terms used in civil engineering  (Highway and expressway)  List of various  acronyms or abbreviations used in civil engineering  TBM- Temporary Bench mark (टे᠎म्‌प्‌ररि बेंच मार्क) BM- Bench Mark ( बेंच मार्क ) / Bituminous Macadam ( बिटुमिनस मैकडम) MSL- Mean Sea Level (मीन सी लेवल) BS- Back sight( बैक साइट) FS - Fore sight  (फोर साइट) HI - Height of Instrument ( हाइट आंफ इन्‌स्‍ट्रमन्‍ट्‌) TS-  Total Station (टोटल स्टेशन) GPS- Global Positioning System (ग्लोबल पोजिशनिंग सिस्टम) DGPS - Differential Global Positioning System ( डिफरेंसिअल ग्लोबल पोजिशनिंग सिस्टम) ROW- Right of Way (राइट ऑफ वे) MTV- material Transport vehicle (मटेरियल ट्रांसपोर्ट वहीकल) NGL- Natural Ground Level (नेचुरल ग्राउन्‍ड्‌ लेवल ) OGL- Original Ground level (अˈरिजन्‌ल्‌ ग्राउन्‍ड्‌ लेवल ) C&G- Clearing and Grubbing ( क्लियरिंग और ग्रबिंग) EMB- Embankment SG- Subgrade (सबग्रेड) GSB- Granular sub-base WMM- Wet Mix Macadam ( वेट मिक्स मैकडैम) WBM- Water Bound Ma
3 comments
Read more

Difference between nominal mix and design mix of concrete

Difference between nominal mix and design mix of concrete - Concrete is most extensively used mix to achieve desired properties of structure. There are two methods to prepare the concrete mix. 1-Nominal mix 2- Design mix Nominal mix - Nominal mix specifies the fix proportion of the cement , sand and aggregates. Ingredients of concrete are mixed on the basis of volume. It is a site level mixing of ingredients to prepare concrete mix. Such type of concrete mix is generally used in small quantity or where load is not high. There are many grade of nominal mix concrete like M-5, M-7.5, M-10, M-15 and M-20. In above grades of concrete mix  the letter 'M' refers to Mix where as the value like 5,7.5,10,15 etc indicates the compressive characteristic strength of concrete after 28 days in specified conditios. Unit of this compressive characteristic strength of concrete is  Newton /mm 2. The ratio of various grade of concrete is being given below - M-5 
3 comments
Read more

Bituminous Concrete (BC) specifications viz. Layer thickness, Mix and material requirements, grading , laying trials, Rolling , Construction procedure, transport and joint specifications, surface finish and quality control,measurement and rate etc..as per MORTH and Indian Standard

Bituminous concrete(BC)- Bituminous concrete( BC) is used for wearing  course and profile corrective courses.BC is generally laid in single layer on a previously prepared bituminous bound  surface. The thickness of single layer of BC shall be 30mm,40mm and 50mm. 1 -MATERIAL A- Bitumen - The bitumen shall be viscosity graded paving bitumin complying with IS 73 or specified in contract aggrement. The type and grade of bitumen to be used would depend upon the climatic condition and the traffic. Selection criteria of viscosity graded (VG) paving bitumens based on climatic conditions B- Coarse Aggregate It consist of crushed rock,crushed gravel or other hard material retained on 2.36 mm sieve. It shall be clean ,hard,durable and of cubical shape,free from dust,and  soft organic and other deleterious substances. The aggregates  shall satisfy the physical requirements of table  no. -2 (Table no. 500-16 ,as per MORTH 5th revision) where crushed gravel is proposed 
3 comments
Read more

Civil engineering interview questions in Roadway/Highway /Expressway department

  Welcome friends, We shall learn about the various questions which are frequently ask by an  interviewer In the field of infrastructure.  So let's get start....... EMBANKMENT/SUBGRADE/BORROW AREA •Liquid Limit  <50% •Plastic Limit  < 25% •Proctor Density(Min. Value) For Embankment =1.52 to 1.60 gram/cubic centimeter For Subgrade= 1.75 gram/ cubic centimeter Sub-grade top • Field Dry Density (FDD) For Embankment= min. 95% For Sub grade = min. 97% •Number of test For Embankment = 1set/3000 sq.meter(1set=10pits) For subgrade= 1set/2000 sq.meter (1 set=10 pits) GRANULAR SUB- BASE •Maximum thickness of single compacted layer = 200 mm • Minimum thickness of single compacted layer( only when GSB is laying in two layers) = 150 mm •Max. Allowable size of aggregate =75mm •Number of grading of GSB = 6 •Liquid limit  should not be  more than 25% ( test procedure as per IS 2720 (part 5)). •Plasticity index should  not be more than 6%
4 comments
Read more