Quiet Pavements presentation

8/9/2019 Quiet Pavements presentation

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UNIVERSITY OF RIJEKA

FACULTY OF CIVIL ENGINEERING

FLEXIBLE PAVEMENT STRUCTURES

QUIET PAVEMENTS

Student : Miran Fe!"# $%%&$%'''%

Ri(e)a# Januar* +$%,-


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Noise is everywhere. It afects our lives at home, at work and generally everywhere.Wherever people live there is noise.

Noise, by denition, is any unwanted or excessive sound. In the world today, noisehas become one o the most ubiuitous orms o environmental pollution.

In tra!c, noise is a growing problem, especially within urban areas. Noise emission otra!c vehicles is dominated with the noise produces by tires. "hat kind o noise isin#uenced by the characteristics o the road surace, like acoustic absorption and

surace texture. "he common noise reduction measures include noise barriers thatprevent sound propagation rom the roadways to the urban areas. "hose measuresare very expensive and inefective in many urban areas.

$onstruction o uieter pavements is considered to be a promising engineeringtechniue or sustainable and environmental riendly roads.

ABSTRACT


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SOUN. LEVELS IN TRAFFIC


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"echniues used to measure the ove mainly used or determining or predicting overallroad side noise level rall tra!c noise in the eld are based upon two basic methods%

pass & by measurement method and close proximity method

'enerally used variations o mentioned pass ( by methods are%)*+ & )tatistical *ass & +y method$*+ & $ontrolled *ass & +y method.

TRAFFIC NOISE MEASUREMENTS

)*+/ method relies on normal tra!c stream on a particular road/ microphones are placed usually at .- m /uropean standard0 rom the centre line

perpendicular to the direction o travel and at 1.2 m height/ taken measurements or three classes o vehicles% passenger cars, dual(axle heavy

vehicles with more than our wheels and multiple(axle heavy vehicles/ mainly used or determining or predicting overall road side noise level

$*+/ similar to the )*+ method

/ measurement setup whereby a microphone or microphones are placed at specieddistance and height with respect to centre line

$*3/ used o comparing tires, vehicles and road suraces/ microphones mounted in close proximity to the tire, tire & pavement interace or

vehicle engine


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4+)I & 4n & +oard )ound Intensity method/ variation o $*3 method/ intensity o sound power created due to tire ( pavement interaction/ microphones are mounted next to a tire and thereore it is also called $lose *roximity

)ound Intensity $*)I0


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5uieter asphalt pavements can be constructed with all common mixtures such as6ense 'raded 7sphalt 6'70, )tone 8astic 7sphalt )870, 4pen 'raded 7sphalt 4'70

and *orous 7sphalt *70 provided that the textures are small and negative.

0UIET PAVEMENT SOLUTIONS


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/ made o open(graded or uniormly & graded aggregates that provide a high air voidcontents 1-9 to 2-90 in the compacted mix with which we can reduce the noise or

: d+/ promising perormance in providing natural drainage and reduction in noise/ maintenance represents a problem with clogging o voids/ single or double ( layer porous mixes and thin suracing are used as noise ( reducing

pavement mixes

*orous or drainage asphalt mixture


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/ gap & graded asphalt mixture with intermediate si;e aggregate missing/ range o noise level is similar to dense graded asphalt pavements

)87 & )plit 8astics 7sphalt

4'7 & 4pen 'raded 7sphalt

/ designed or high skid resistance properties, is similar to porous pavement but withlower void contents which are achieved through use o higher ner aggregates

/ provides noise reduction potential because part o the sound energy is absorbedthrough the voids in the mixture


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/ hydrocarbon binder obtained through physical and chemical interaction o crumbrubber produced by recycling o used tires with bitumen and additives

$


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/ high structural durability and stability under very high tra!c/ burlap and articial tur drag textures have shown to be the uietest ollowed by the

diamond grounded suraces

/ longitudinally tined surace has shown to be uieter than transversely

5uiet concrete pavement

/ diamond grinding concept, known as whisper grinding produces low texturedsuraces and is shown to reduce the noise

/ shown to be the uietest and smoothest *$$ reducing the $*3 measured noise or ?d+ on newly grinded surace


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/ noise level varies widely even within the same pavement group

COMPARISON OF .IFFERENT PAVEMENTS


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/ developments o a consist tire & pavement noise data base in $aliornia and 7ri;ona,caused considerable interest in applying this same measurement approach topavements in /urope & in our countries in /urope ( 'ermany, the Netherlands,@rance, and +elgium

/ tests perormed in $aliornia and 7ri;ona showed ollowing observations%10 *avement type can reduce tire ( pavement noise up to A or 1= d+20 signicant range in tire ( pavement noise perormance is in each o the generic

groupings o pavement *$$, 6'7$, and 4'7$B


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/ 6/F@


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7s the tire & pavement interaction noise depends mainly on the surace

macrotexture, it provides the opportunity to play with the pavement surace mixesand surace textures to reduce the noise.

/xamples presented here also showed that techniues are available to reduce thenoise without sacricing the saety and durability.

Dowever, careul selection and construction is the key to achieve benecial noise

reduction by the pavement itsel.

CONCLUSION


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REFERENCES:

Articles in a magazine). ukuJiK, L. 6ragiMeviK, ".

Documents

Quiet Pavements presentation