BITUMINOUS ROAD PPT

BITUMINOUS(asphalt) ROADSUMMER INTERNSHIP PROJECT REPORT

2015

Submitted to : Submitted by - Department of CIVIL ENGINEERING NAME –SHUBHAM PALIWAL ROLL No. 121000078 SECTION –B2

CONTENTS1. Introduction to bitumen.2. Introduction to bituminous road.3. Definitions .4. Bituminous road layer.5. References .

Bitumen is a black or dark colored solid or viscous cementitious substance having an adhesive properties.

It consists chiefly high molecular weight hydrocarbons derived from distillation of petroleum or natural asphalt.

It is a semi-solid hydrocarbon product produced by removing the lighter fractions (such as liquid petroleum gas, petrol and diesel) from heavy crude oil during the refining process.

INTODUCTION TO BITUMEN

Bitumen is often confused with tar. Although bitumen and coal tar

are similarly black and sticky, they are distinctly different

substances in origin, chemical composition and in their properties.

ORIGIN- Asphalt material have been utilized since 3500 B.C .In

building and road construction. Their main uses have been as

adhesives and water proof agent .

INTODUCTION TO BITUMEN

Bituminous road is a road constructed by using

bitumen. It is also called flexible pavement because it changes its shape according to nature of load and sub base.

A road or pavement is a structure consisting of superimposed layers of processed materials above the natural soil sub-grade, whose primary function is to distribute the applied vehicle loads to the subgrade.

The pavement structure should be able to provide a surface of acceptable riding quality, adequate skid resistance, favorable light reflecting characteristics, and low noise pollution.

INTRODUCTION TO BITUMINOUS ROAD

Bitumen (asphalt) source

.

CONSTITUENTS OF BITUMEN MIX

BITUMINOUS ROAD LAYER

BITUMINOUS ROAD LAYER

This type of pavement has four layers namely, sub grade (bottom most), sub base, base and wearing surface (top most).

Thickness of layer decreases normally from bottom to top.1.(SUB GRADE LAYER)

The SUBGRADE is the layer of naturally occurring material or the fill material the road is built upon.

Where the SUBGRADE is weak, i.e. a low CBR, it will be necessary to have a CAPPING LAYER over the subgrade to increase the strength before the actual road pavement thickness is designed.

BITUMINOUS ROAD LAYER

This capping layer is usually a granular type material designed to provide a working platform on which sub-base construction can proceed with minimum interruption from wet weather.

capping is also used to minimize the effect of a weak subgrade on pavement strength.

2.SUB BASE LAYER This particular layer in ROAD PAVEMENT construction, is quite

often used to refer, some what misleadingly, to the material GRANULAR SUB-BASE.

BITUMINOUS ROAD LAYER

I. The primary functions of sub base layer are Improve

drainage , Minimise Frost action damage. ,Provide a working platform for construction.

II. The material used in this layer - Granular sub base ,Cement bound material.

3.ROAD BASE (BASE) The ROADBASE is the main load-bearing / load spreading layer

in the road structure and is usually 100mm. or more thick depending on the loading of the traffic for which the road is

designed.

ROAD LAYER

Generally BASE layer is made of crushed slag, crushed stones

and other stabilized materials -Aggregates and Hot Mix Asphalt are usually used in this layer.

BINDER COURSE- This is the layer of material below the SURFACE COURSE and above the ROADBASE.

BASE COURSE (binder course) is most commonly a bituminous material, and can be either HOT ROLLED ASPHALT or DENSE BITUMEN MACADAM (asphalt concrete).

ROAD LAYER

The WEARING COURSE (surface course) is the top layer of the ROAD PAVEMENT and is designed – To be impervious to the ingress(entering) of water. To be durable, and have a high resistance to skidding. To be chosen so as not to deform under the weight of traffic

appropriate to the road.

ROAD LAYER

Seal Coat: It is a thin surface treatment used to water-proof the surface and to provide skid resistance.

Tack Coat: It is a very light application of asphalt, usually asphalt emulsion diluted with water. It provides proper bonding between two layers of binder course and must be thin, uniformly cover the entire surface, and set very fast.

Prime Coat: It is an application of low viscous cutback bitumen to an absorbent surface like granular bases on which binder layer is placed. Unlike tack coat, prime coat penetrates into the layer below, plugs the voids, and forms a water tight surface.

OPRATIONS

Introduction to pavement design by Prof. Tom V. Mathew 2009-

02-27. Highway engineering by S.K.Khanna and Justo. Construction equipment and planning by Mohesh Verma. http://www.pavingexpert.com/subgrade.htm . AASHTO Guide for the Design of Pavement Structures. Images -www.google.co.in.

REFERENCES

Thank you!