Manshu

GOVT.COLLEGE OF ENGINEERING,KARAD

Name :Mr.Himanshu Satoskar Roll No : 09154

A Seminar on

NOISE CONTROL ON HIGHWAYS

CONTENTS

IntroductionAim and its objectiveSound and NoiseNoise barrierTyre and Pavement NoiseTypes of pavementsConclusionReferences

SOUND AND NOISESound is small but fast changes

in air pressure that cycle higher and then lower than the air pressure that is all around us.

Noise is a sound that is objectionable to individual.

Decibel

Sound-level[Db]=20*log10([Pa]/0.0002Pa)

Figure 1. Comparison of sound pressure, sound levels, and common examples

TRAFFIC NOISEPropulsion noise At low speedTyre-Pavement noise Cross-over speedAerodynamic noise High speed

EFFECT OF VEHICLE TYPE AND SPEED

CONTROL OF TRAFFIC NOISE

Six possible methods to reduce traffic noise

Noise barriersReducing source noise intensityEncouraging use of hybrid &

electric highwaysImproving aerodynamics & tyre-

designLow noise paving material

NOISE BARRIERA noise barrier is an interior

structure designed to protect sensitive land uses from noise pollution.

Most effective method• Reduce loudness of noise by half• Reduce noise level for people

living next to highways• Do not increase noise levels on

opposite highways

NOISE BARRIERHistory DesignWorkingMaterial

Types of noise barriers

Grooved noise barrierDeveloped by Carsonite

International Light-weight hollow panels made

of tongue and groove planks of reinforced composite materials filled with crumbed tyre rubber

Disadvantages and limitationsAesthetic impacts for motorists &

neighbours, if scenic views are blocked

Cost of design, construction and maintenance

Necessity to design custom drainage that the barrier may interrupt

TYRE-PAVEMENT NOISE

Reasons behind tyre –pavement noise• Tread impact• Air pumping• Stick-slip• Stick-snap

Amplification of sound• Acoustical horn• Helmholtz resonance• Pipe resonance• Cavity resonance

Pavement PropertiesTexturePorosityStiffness

ASPHALT ALTERNATIVESPorous asphaltGap-graded stone-matrixDense-graded asphalt mixtureAsphalt rubber friction course

ASPHALT RUBBER FRICTION COURSEBenefits: Safety Significant reduction of traffic noise in urban area Improved surface water drainage, reducing safety hazards of

hydroplaning and visual impairing water spray Potentially major cost savings through elimination of sound

barriers Reduction of maintenance costs through improved crack

resistance Conserves natural resources (friction course can be reduced

in thickness, conserving aggregate and asphalt cement) Can save initial capital construction costs through cost-

effective alternative to road construction Improved road structural stability by preventing moisture

penetration into road foundation Elimination of waste tyres through productive recycling

a)Porous Asphaltb)Gap-graded stone matrixc)Dense-graded asphalt mixture

CONCRETE ALTERNATIVESDrag and Diamond ground

concreteLongitudnal TiningTransverse TiningExposed aggregatePorous concrete

a)Drag & Diamond ground concreteb)Longitudnal Tining & Transverse Tiningc)Exposed aggregate & Porous concrete

CONCLUSIONThough this technique of noise control is

not yet developed in India, it is going to be one of the important aspects of highway engineering in near future, as the cities are expanding the boundaries of the cities are now very close to highways. In recent years conscious efforts have been made to reduce the highway noise. The techniques of quieter asphalt and concrete pavements should be implemented. The noise control will help us to achieve the goal of safe, quiet, durable highways.

REFERENCESUlf Sandberg and Jerzy Ejsmon, Tyre/Road Noise Reference book(2005)Traffic Noise Model Technical Manual(FHWA-PD-96-010)Robert Bernhard,An Introduction to Tire/Pavement Noise(SQDH 2005-1)William M. Hartmann,Signal,Sound and SensationLeo Beranek and Istvan Ver, Noise and Vibration Control Engineering

Web-sections•www.fhwa.dot.gov/environment/noise•www.fhwa.dot.gov/pavement•www.quietroads.com•www.dot.ca.gov/hq/env/noise•www.ncat.us•www.cptechcenter.org

Special Thanks to-

•Prof.Dr.S.K.Hirde•Prof.Dr.Y.M.Ghugal