Dense Bituminous Macadam Laying Procedure/Complete process of DBM and BC Laying/DBM Laying Process
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- Опубліковано 17 чер 2021
- MORTH Section 500
Clause 505. Dense Bituminous Macadam
The Specification describe the design and Construction procedure for Dense Bituminous Macadam (DBM), as a surface course material. laid on approved Primed surface of Base or sub-base. the thickness of DBM in single layer shall be 50 mm to 100 mm
Material - Coarse Aggregate shall consist of crushed rock, crushed gravel or other Hard material retained on 2.36 mm sieve. The aggregate shall satisfy the requirements specified in MORTH section 500 table 500-8
Filler shall consist of finely divided mineral matter such as rock dust, hydrated lime or cement. the filler shall be graded within the limits indicated in table 500-9
Table 500-8 physical requirement for Coarse Aggregate for Dense Bituminous Macadam
AIV - Max 27% as per IS2386 Part iv
EI & FI - Max 35% as per IS 2386 part I
Durability soundness either,
Sodium sulphate 12% IS 2386 part v
Magnesium Sulfate 18%
Water absorption - Max. 2% IS 2386 part III
Coating and striping of Bitumen aggregate mix Min. retained coating 95% IS 6241
Water sensitivity Retained tensile strength
Min. 80% AASHTO 283
Table 500-9
Grading requirements for Mineral Filler
Table 500-10
Composition of Dense graded Bituminous macadam
Nominal Aggregate Size
Grading 1 37.5
IS sieve (mm) passing %
45 100
37.5. 95-100
26.5. 63-93
13.2. 55-75
4.75. 38-54
2.36. 28-42
.300. 7-21
.075. 2-8
Bitumen content % by mass of total mix.
Min. 4%
MiX design as per Asphalt Institute Manual MS-2
job mix formula DBM shall be prepare as per specification
Laying and Rolling
Laying temperature 150•c
Rolling tempreture min. 100•c
Mixing at HMP
Bitumen Temperature 160•c-170•c
Aggregate Temperature 160•c - 175•c
Mixed Material Temperature 160-170•c
Laying temperature min. 150•c
Rolling Tempreture. Min. 100•c
Bitumen used for mix is Viscus grade VG 40 as per IS: 73
RS 1 is used as tack coat material as per IS 8887
rate of spray of tack coat on primed surface before DBM laying is per table 500-5 is 0. 25 kg to 0. 30kg per square meter with the help of specified sprayer distributor with suitable nozzle
Speed of Roller shall be 5km per hour during rolling of mix at site
Rolling should be from edge to center or Lower to higher side.
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Very good explanation sir...
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❤❤❤❤
👍
Very nice explanation.
Interrupted voice due to sounded machines.
Good Sharma ji keep it up 👌
good job keep it up
good explanation
good job
great effort
Great job
very well explained
Nice
Thank you sir
nice
Hello ❤
Dbm laying mein jab lay karte h toh jo longitudinal joint bante h unko kaise overcome kare ya rectify kare ya kya process h ki joint na dikhe
Logitudnal joint ko carefully banana chahiye.ise banate samay vertical cut Kare phir minimum 50mm overlap laying Kare.Rolling kar sabse pahle longitudinal joint ko Compact kar le. workman ship ke liye achhe skilled laying labour hona chahiye. Straight edge ka upyog kar gap ko check kar le. is Tarah aapka longitudinal joint sahi banega
Hello bhaiya kahi Pever oprater me jagh hai toh batana
Sure
Please share the morth literature...which states that loose thickenss should be 30 percent more than targeted compacted thickness
about loose thickness of DBM it's all depend on trial and error method. MORTH say that Before start DBM laying you first prepare trail patch where you confirm compaction
Sir, under PMGSY Department on ongoing site where we have done wmm and applied Emulsion ss1 but when we do tackcoat and start for 20 mm thick OGPC carpet then the layer of mud sticks to tyre of vehicle, and the only dust remains on surface after that, we dont have provision of dbm and bc we only have to do wmm then prime coat then tackcoat then 20 mm carpet how to do plz reply
After the application of Prime coat SS1 the Primed surface shall be closed for 24 hour and after 24 hour tack coat RS1 you can use before laying of OGPC.
Some are road is very damaged for that can i use BM and for other pre-mix carpet with use of emulsion as tack coat. Further can we apply pre-mix carpet over BM ??
After BM you can use seal coat for better result
BM is best material for potholes filling and BM laying we can use Seal coat
@@nomadprs some portion of roads are in good condition but need resurfacing so can i use 2.5 cm pre-mix carpet item for that...
Bhi vdo app sahi lakin vdo ka quality nhi aara ha,,
Koshis karunga achha video Banaunga
Dear Respected sir please used Bluetooth or Earphone for proper valume
Excellent keep it up
OK sir noted
sir rate of prime coat, tack coat, seal coat bataye
Prime coat @ 0.7 to 1kg/Sqm
Tack coat @ 0.25kg to 0.3kg/sqm
Seal coat me Bitumin 6 to 7%
Dust kitne percent h?? Pls rply
depends on gradation of aggregate
in our project dust percentage is 45 to 50 percent
For DBM??
Yes for DBM dust is 45 to 50%
Aap 100 mm thickness ek hi baar me kar rahe hain
as per morth section 500, 100 mm thickness of DBM laying is permissible
Loose thickness kitna lena
For Compacted 100mm Loose thickness 128 to 130mm
@@nomadprs For compacted Bituminous concrete 30 mm k liye kitna loose thickness hoga.
Aur Bituminous Macadam compacted 50 mm k liye kitna loose thickness hoga
Pls reply
BM grading2 and BC grading2 k liye loose thickness
@@ayazarmaania100 mm
good job keep it up
good job
good job
good job