Pavement in Japan

Kazuyuki Kubo
Leader, Logo
Pavement Team
Public Works Research InstitutePaved Rate
Not Paved Rate
Paved Rate

Paved Rate

100908070605040

Not Paved Rate

30201001960 1965 1970 1975 1980 1985 1990 1995 2000 2004

Road Networks and Paved Roads(2004.4.1)
Asphalt 6,800km
Cement 500km

Motorway 7,300km

Asphalt 21,000km(for Light Traffic 400km)
Cement 1,100km

National Roads 22,100km(Managed by MLIT)

Asphalt 30,600km(for Light Traffic 4,700km)
Cement 1,000km
Not-paved 400km

National Roads 32,000km（Managed by Prefecture andMetropolitan Cities）

Prefectural Roads
129,000km
Municipal Roads
997,300km
Total
1,187,700km

Asphalt 122,200km(for Light Traffic 47,600km)
Cement 1,700km
Not-paved 5,100km

Asphalt

Asphalt forLight Traffic

Asphalt 698,000km(for Light Traffic 573,500km)
NotCement 50,800km
paved
Not-paved 248,500km

CementAsphalt 878,600km(for Light Traffic 626,200km)
Cement 55,100km
Not-paved 254,000km

Technical Standards

Manuals for pavement technologies had been published andrevised by Pavement Committee in Japan Road Association– Asphalt Pavement in 1950
– Cement Concrete Pavement in1955– Recycling in 1980
– Drainage Asphalt Pavement in 1995

In 2001, the Ministry of Land, Infrastructure, Transport andTourism established “Technical Standard for Pavement
Structure”, which is based on performance-based
specification.

Recycling Ratio of Construction By-Products

Recycling Ratio of Asphalt Concrete is Over 98%

All of Construction
By-Products

85%

58%

98%

Asphalt Concrete
Cement concrete
Waste Woodfrom Construction site
Construction Sludge
Mixed Construction
Wastes81%
For Construction Material 38%

14%
9%
11%

020

40%
41%

40

For Fuel

96%

65%

45%

83%

2000 fiscal year
1995 fiscal year
60

80

100%

Plant Recycling
Recycled aggregate(Used pavement)

Asphalt Mixture Recycle Plant

 Recycle pavement

by-products at a
stationary mixing
plant (recyclingmixing plant) Reuse them aspavement materials

Rejuvenator

Recycled HMA

Virgin aggregate
Virgin Asphalt

Plant Recycling
80,00070,00060,000Virgin Mixture
50,00040,00030,000Recycled Mixture

20,00010,000

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

1996

1995

1994

1993

1992

0

1991

Total Production of Asphalt Mixture (×1,000ton)– Law Concerning thePromotion ofProcurement of EcoFriendly Goods andServices by the Stateand Other Entities (Lawon Promoting GreenPurchasing), enacted inFY2000

90,0001990

Most popular in Japan Recently, the ratio ofrecycled asphalt
mixture is close to 70%.
 Recycled asphalt
mixture has alreadybeen promoted to use
according to thefollowing lawDrainage Asphalt Pavement
Surface course ; Porous Asphalt Mixture
Binder course ; Dense-graded Asphalt Mixture /Coarse-graded Asphalt Mixture
Typical Properties of Porous Asphalt Mixture
・Maximum Particle Size: 5～13mm
・Air Voids: 17～23%
・High Viscosity Modified Asphalt

4~5cm
5cm

Advantage of Drainage Asphalt Pavement
・The place where requires somecountermeasure for traffic noise→ Attention to the performance ofnoise reduction→ Performance specification by thenoise level

Noise・The place where the safe drive in rainy days isrequired→ Attention to the performance of water drainage
RainImprove Road Safety in Rainy Days
Less water on road surface– Improve skid resistance– Improve driver’s sight

More than 70% of Expressways are paved byDrainage Asphalt

Conventional Pavement
Drainage Asphalt Pavement

Thank you for your attention