What is BC and BM?
Method Statement For Laying of Binder Coarse (BC), Dense Bituminous Macadam (DBM), Bituminous Macadam (BM) for the main carriageway and Semi Dense Bituminous Macadam (SDBM) for the service roads.
What is difference between BM and DBM?
Bituminous Macadam (BM) The void content is 20 to 25% higher than the dense graded bitumen (DBM). The DBM have a void content of 3 to 5%. The BM have high potential to attract water and moisture.
What is semi dense bituminous macadam?
Semi Dense Bituminous Macadam is a binder that is laid after the BM course to obtain smoother finish on road surfaces. This is used in small roads of width less than 9 Meters. This course is laid directly on the wet mix macadam in smaller roads with a thickness of 25-30 mm.
What is BM and BC in road construction?
1)Bituminous Macadam(BM) 50mm/75mm/100mm. 2)Bituminus Concrete (BC)
What is GSB layer?
Granular Sub-base (GSB) consists of laying and compacting well graded material on prepared sub-grade in accordance with the specifications.: GSB layer is intermediate layer in between Sub-grade and Wet mix macadam. GSB layer is laid in roads and higway works due to its properties .
What is DBM layer?
Engineering. Dense Bituminous Macadam (DBM) is a binder course used for roads with more number of heavy commercial vehicles and a close-graded premix material having a voids content of 5-10 per cent.
What is BC in road construction?
BITUMINOUS CONCRETE (BC) ❖ BC is a Dense Graded Bituminous. Mix used as Wearing Course for. Heavily Trafficked Roads.
What is BBM in road construction?
CONSTRUCTION OF BITUMEN BOUND MACADAM FOR STRENGTHENING OF ROAD PAVEMENT. This paper describes the properties of bitumen bound macadam (BBM) and compares its performance with that of water bound macadam (WBM) and BUSG, a specification used by the Indian Ministry of Surface Transport.
What is SDBC Road?
Semi-dense Bituminous Concrete (SDBC) Roads that require a durable all-weather surface measuring 25-40 mm in thickness over previously prepared CRRI-BitChem Cold BM structure, with closed graded aggregates.
What is the density of SDBC?
Maximum bulk density, gm/cc = 2.25 at bitumen content, % = 5.0. Bitumen content at flow value of 3.0mm = 4.35% Design bitumen content: 4.95%
What is DBM and BC?
DBM (Dense Bituminous Macadam) & BC (Bituminous Concrete) are the top most layers of an Bituminous Top Roads, whose thickness is determined my MSA & CBR. CBR- California Bearing Ratio is a method of determining the mechanical strength & Load bearing capacity of soil.