# 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 BM and BC road?

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.

## What is DBM and BC in road construction?

There are two main types of dense graded mix used.

Dense Bitumen Macadam (DBM) Bituminous Concrete(BC)

## What is the meaning of BM in road construction?

2.2 Bituminous macadam (BM) shall consist of mineral aggregate and appropriate binder, mixed in a hot mix plant and laid with a mechanized paver. It is an open graded mixture suitable for base course. It is laid in a single course or in a multiple layers on a previously prepared base.

## How is bitumen calculated in BC?

Formula for Calculation of Bitumen Quantity in Road:
1. Find out the dimension (Width and thickness)
2. Calculate Volume of Asphalt = (Long * Width * Thickness) m^3.
3. Find out the density of Asphalt (2330 or 2400 Kg/m^3)
4. Calculate the quantity of Asphalt= ( Density* Volume)/1000.

## How much bitumen is 1km road?

For the average can accept 2330 kg/m^3.

## What is VG in bitumen?

Viscosity Grade Bitumen (Asphalt) is a Bitumen grade mostly used as a Paving Grade and it's suitable for road construction and for the asphalt pavements producing with premier attributes. VG Bitumen is usually used in the production of hot mix asphalt.

## What is DBM laying?

Dense Bituminous Macadam (DBM) Preparation and Laying Methodology. Description. The DBM materials shall be laid by a self-propelled sensor paver finisher equipped with a hopper, delivery augers and capable of spreading, tamping and finishing the mix to specified grade, lines and cross-section.

WBM road means water bound macadam road. The wearing surface of WBM road consist of clean and crushed aggregates which are mechanically interlocked by rolling operation. The material is bound with filler material (which are also called as screenings) and water, laid on prepared base course.

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 .

## How is GSB calculated?

Gsb = Bulk dry specific gravity of the total aggregate P1,P2,Pn = Percentages by weight of aggregates, 1,2,n; G1,G2,Gn = Bulk specific gravities of aggregates 1,2,n. The bulk specific gravity of mineral filler is difficult to determine accurately at the present time.

## What is WBM and WMM?

WBM(Water Bound Macadam) conventional method and WMM(Wet Mix Macadam) modern technology- are base course layers for Pavement/Road design. In case of WBM stone aggregates and binders are overlaid on one another at the time of construction.

## What is the PQC?

Pavement Quality Concrete (PQC) is normally employed for providing a strong surface of rigid pavements. PQC is also used for construction of runways in airports in order to distribute the heavy impact load from wheel to sub- grade layers [1].

## What is DLC construction?

The current practices of the construction of cement concrete road for highways in India require a layer of dry lean concrete (DLC) as a base course over which pavement quality concrete slabs rest. It is one of the common and popular cement treated sub-base/base for concrete pavements.

## What is the thickness of WMM?

Wet Mixed Macadam (WMM) Base thickness of single compacted should not be less than 75 mm. WMM shall be laid in layers of 75mm or 100mm as per thickness.

## What is the thickness of DBM?

DBM (Dense Bituminous Macadam) is a part of flexible pavement and the work shall consist of construction of single or multiple layers on wmm or sub base. The thickness of single layer shall be 50mm to 100mm as per MORTH specification.

## What is the meaning of 60 70 bitumen?

A grade of 60/70 bitumen means the penetration value is in the range 60 to 70 at standard test conditions which usually used as a Paving Grade. Bitumen 60/70 is applicable for the production of asphalt pavements with superior properties and for construction and maintenance of roads.

## What is VG 40 grade bitumen?

VG-40 is used in highly stressed areas such as intersections, near toll booths and truck parking lots instead of 30/40 penetration grade. Because of higher viscosity, stiffer Bitumen mixes can be produced to amend resistance to shoving and other problems related to higher temperature and heavy traffic loads.

## What does 30 mean in VG 30 bitumen?

According to the viscosity bitumen classification, 30 in VG 30 bitumen means the range of viscosity [(100 +- 20) * 30] in terms of Poise. It is possible to calculate the minimum and maximum of the VG30.

## How do I calculate asphalt?

How to Calculate Asphalt Tonnage
1. Use a tape measure to determine distances. ...
2. Convert the length, width and height measurements to feet by dividing by 12, since each foot contains 12 inches. ...
3. Multiply the length times the width times the depth to obtain the volume in cubic feet of the space to be paved.

## Why is prime coat applied?

The prime coat is basically designed to harden or toughen the base surface, to provide adhesion between the base and the asphaltic courses, to coat and bond loose aggregate particles, and to waterproof the surface of the base.

## How is road thickness calculated?

The authors suggest the following computation method for obtaining pavement thickness using Gray's formula: (1) carefully study the traffic mix likely to occur at a project site; (2) calculate the total load and radius of the contact area on the basis of the proportions of vehicle types; (3) add an extra impact factor ...

## What is DLC and PQC?

PQC stands for Pavement Quality Concrete made with larger size aggregates following IRC specifications and laid over a Dry Lean Concrete(DLC), concrete subbase course. PQC construction is explicitly used for highway concrete pavements and runway pavements to take heavy loads.

## What is M40 concrete mix ratio?

A Grade M40 concrete with a mix proportion of 1:1:2:0.35 (cement: sand: granite: water-to-cement ratio) was used for all concrete mixes.
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