1 1 Development of Hot In-place Transforming of Dense Graded Asphalt Mixture to Porous Asphalt H. Hosokawa, Green ARM Co., Ltd., Tokyo, Japan A. Gomi, Green ARM Co., Ltd. T. Okuno, Hitachi Construction Machinery Co. Ltd. F. Goto, Sumitomo Construction Machinery Co. Ltd. S. Tanaka, NIPPO MECX Co. Ltd. A. Kasahara, Hokkaido Institute of Technology
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Development of Hot In-place Transforming of Dense … ICAP...1 Development of Hot In-place Transforming of Dense Graded Asphalt Mixture to Porous Asphalt H. Hosokawa, Green ARM Co.,
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11
Development of Hot In-place Transforming of Dense
Graded Asphalt Mixture to Porous Asphalt
H. Hosokawa, Green ARM Co., Ltd., Tokyo, Japan
A. Gomi, Green ARM Co., Ltd.
T. Okuno, Hitachi Construction Machinery Co. Ltd.
F. Goto, Sumitomo Construction Machinery Co. Ltd.
S. Tanaka, NIPPO MECX Co. Ltd.
A. Kasahara, Hokkaido Institute of Technology
22
33
Train of Hot In-Place Transforming Machines
Making history for asphalt paved roads
44
PP PPPP DDPP
D D PPDD DDDD
PPDDAfter workBefore work
HIR
HIR
HIT
HIR vs. HIT
55
Through One Passfrom Dense to Porous
on Site
First Technology in the World Patent Granted, August, 2006
66
1.Heating and softening the asphalt pavement
Pre-Heater
77
3.Milling of existing asphalt mixture
4.Transfering new asphalt mixture
2.Heating and softening the asphalt pavement
Heater & Miller
88
Screener & Mixer5.Gathering recycled asphalt mixture from the pavement surface
6.Screening recycled asphalt mixture into in accordance with aggregate size
7.Supply of additives (Bitumen and/or Rejuvenator)8.Mixing of the recycled asphalt mixture for upper layer with new
asphalt mixture and additives (Bitumen and/or Rejuvenator)
99
Mixer & Tandem Paver9.Gathering recycled screened asphalt mixture for the lower layer
10.Supply of additives (Bitumen and/or Rejuvenator)
11.Mixing of recycled screened asphalt mixture for the lower layer with additives (Bitumen and/or Rejuvenator)
1010
13.Spreading of the recycled asphalt mixture for the upper layer
12.Spreading of the recycled asphalt mixture for the lower layer
1111Road before and after HIT ( Sept. ’05 OKINAWA )
Product of HIT
1212
Surface Layer Change
1313
Mechanics:
Heating & Milling
Screening
Tandem Paving
Materials:
Warm mixing
Key Technologies
1414
Heating Capacity
1515
Gradation after Milling
26.5mm19.0mm
13.2mm4.75mm
2.36mm0.6mm
0.3mm0.15mm
0.075mm19.04.752.360.60.30.150.075
13.2
0
10
20
30
40
50
60
70
80
90
100Gradation after milling
Gradation of existing dense graded asphalt concrete
Specification limits of gradation
1616
Screening
26.5mm19.0mm
13.2mm4.75mm
2.36mm0.6mm
0.3mm0.15mm
0.075mm
1717
Screening
26.5mm19.0mm
13.2mm4.75mm
2.36mm0.6mm
0.3mm0.15mm
0.075mm
1818
Screening CapacityScreening Capacity
0
10
20
30
40
50
60
70
80
90
100
Sieve size (mm)
Perc
ent
pass
ing
(%)
Existing Asphalt Concrete(Dence Graded Asphalt)
Screened Particle forPorous Asphalt
26.5mm19.0mm
13.2mm4.75mm
2.36mm0.6mm
0.3mm0.15mm
0.075mm
1919
Tandem paving and CompactingTandem paving and Compacting
26.5mm19.0mm
13.2mm4.75mm
2.36mm0.6mm
0.3mm0.15mm
0.075mm
2020
Compacted CoreCompacted Core
28mm
30mm
Porous Asphalt
Mastic Gap Asphalt
Dense Graded Asphalt Concrete
2121
Degree of CompactionDegree of Compaction
Compaction Temperature: 127.0C
100.6%100.6%96.6%96.6%
Mastic Gap AsphaltMastic Gap Asphalt(Lower Layer)(Lower Layer)