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*This is the summary of report of
ARPG(Asphalt Rubber Producers Group) in U.S.A. Refer to USA RPA
(Rubber Pavement
Association) for original script.
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- Access
First
Finding : combination of Asphalt called drainage (rubber added) called
Drainsphalt in Brussels of Belgium in 1981. according to the various research up
to now,
it has been verified that noise is reduced by 65% to 85%
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- Research of decrease in noise
ㆍDrainasphalt(Open Graded Hot Mix)
ㆍLocation and year : Motorway
South of Ghent(Brussels, Belgium) in 1981
ㆍResearcher : Chairman of Asphalt
Pavement Committee in Bonn of Germany,
Mr. E. Nakkel
ㆍResult : noise
reduction 8-10dB or 75% |
- Drainasphalt(Open Graded Hot Mix)
ㆍLocation and year : pavement around Chenue River in Paris
France in 1984
ㆍMichel Amilhat, Societe des Autoroute Nord et de l'est de La
France
ㆍResult : noise reduction by 3-5dB(no Trucks). 2-3dB(5% Trucks),
50-70% overlay of rubber asphalt introduction
is actively recommended in
the road of Paris as a result of noise reduction. |
- Installation of soundproofing wall
ㆍHorst Pochhacker, explained Drainsphalt constructed in Bonn,
Germany in 1980 at the conference : only 10% of
the cost of installation of
sound proof wall is required in case of using rubber asphalt covering.
ㆍE :
Nakkel reported that the effect of noise reduction is increased as the thickness
of Drainasphalt is increased. In other words, noise is lower in case of 4cm
pavement
rather than that of 2cm and also noise is reduced by minimum
3dB,50% |
- Pavement with rubber asphalt 2.3inch(6cm)
ㆍLocation and year : test road (Belgium) in 1988
ㆍResearcher : Heerkens
and Von Meier
ㆍOutcome : 3.5dB noise reduction in comparison with
conventional hot-mixed asphalt pavement in case of 72mph(120km) and 9dB in
comparison with cement pavement (noise reduction 60- 80%)
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- Draining Mix
ㆍLocation and year : Europe in 1989
ㆍResearcher : rubber
aspahlt Bituman was used at pavement construction according to Van de Veld,
report.
ㆍOutcome : noise reduction of 3dB-10dB in case of velocity of
35mph(60km)- 60mph(100km) by 50-90% |
- Gap Gradded AR Hot Mix(1inch)
ㆍLocation and year : Phenix in Arizona state in 1990
ㆍResearcher : Western Technologies
ㆍOutcome : noise reduction by 6.7dB,
78%. Specifically 80.4dB in comparison with cement pavement and 73.7dB in
comparison with drain (rubber added) asphalt pavement.
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- Open Graded AR Hot Mix Overlay on Cement Concrete
Pavement
ㆍLocation and year : national
motorway No.19 in the southern part of USA in 1989 Tuscan
ㆍresearcher :
WesternTechnologies
ㆍoutcome : noise reduction by 6.7dB, 78%. Specifically
80.4dB in comparison with cement pavement and 73.7dB in comparison with drain
(rubber added) asphalt pavement. |
- Rubber asphalt Conference (Austria in 1988)
ㆍLocation and year : Austria A-9 highway,
Pyhrnam Autobahn, Inntal Mortorway in 1988
ㆍResearcher : Helmut Prager,
Austrian engineer
ㆍOutcome : 4-5cm produces better noise reduction compared
to 3cm. noise if reduced by more than 3dB, 50% when it is covered to old
stone road.
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- Drainasphalt Overlay(1985, 1987), AR 6.6%
used
ㆍLocation and year : Autobahn in 1988
ㆍResearcher : E.Reinish
ㆍOutcome : noise reduction of 6dB,75% |
