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)
Porous AsphaltPorous Asphalt(Upper Layer)(Upper Layer)
Degree of CompactionDegree of Compaction
2222
Warm Mixing of Porous AsphaltWarm Mixing of Porous Asphalt
Degree of Compaction: Degree of Compaction: 96.6%96.6%
Compaction Temperature: 127.0C
Hot Mixing
1,7201,720Viscousity Viscousity (180C)(180C)mPamPa.S.S
5,4105,410Viscousity Viscousity (150C)(150C)mPamPa.S.S
1.0051.005Density (15C)Density (15C)g/cmg/cm33
342342Flash PointFlash PointCC
90.590.5Softening PointSoftening PointCC
5959Penetoration Penetoration (25C)(25C)1/10mm1/10mm
PropertyProperty
2323
Naha Airport
Train of Machines
2424
Tokyo
Okinawa
Naha Airport
2525
Test Test TransformingTransformingTMTM work date & Plan viewwork date & Plan viewExecution areaExecution area：：2,470m2,470m22
〔〔 2 Lines (1Line ; 3.5m) , Execution length is 686m (1Line ; 343m2 Lines (1Line ; 3.5m) , Execution length is 686m (1Line ; 343m) ) 〕〕
No.30
No.0
North bound
South bound
NN
2626
Transforming OperationTransforming Operation
2727
2828
2929
3030
Temperature MeasurementTemperature Measurement
a b
c
d e f g
a. 194.3C d. 149.3Cb. 229.0C
e. 93.5C
c. 162.2C
g. 125.0Cf. 127.0C
3131
Percent passing (After transforming)Percent passing (After transforming)
0
10
20
30
40
50
60
70
80
90
100
Sieve size (mm)
Perc
ent
pass
ing
(%)
Porous asphaltconcrete
Mastic gap asphalt
Specification limitsof porous asphalt
0.075mm0.15mm
0.30mm0.60mm 2.36mm
4.75mm13.2mm
19.0mm
3232
InIn--situ Permeability Testsitu Permeability Test
Premeability(ml/15sec)
StandardValue
No.10 1,310No.20 1,402No.30 1,354No.10 1,354No.20 1,429No.30 1,399
1,375Ave.
Measurement Point
More than 1,000
South bound
North bound
3333
Water permeability testWater permeability test
3434
ContributionContribution
Reducing Gas Emission
Saving Energy
3535
Gas EmissionGas Emission[ Comparison of HIT and Mill & Fill (2m/min) ][ Comparison of HIT and Mill & Fill (2m/min) ]
87.79
3.29
18.956.56
179.47
9.58
58.81
11.15
0
20
40
60
80
100
120
140
160
180
200
CO HC Nox Sox
HIT
Mill & Fill
1161113929
0
2000
4000
6000
8000
10000
12000
14000
CO2
Tota
l Gas
Em
issi
on (
%)
Reduction rate51.1%
Reduction rate65.7%
Reduction rate67.8%
Reduction rate41.2%
Reduction rate16.6%
3636
Gas EmissionGas Emission[ Comparison of HIT and Mill & Fill (3m/min) ][ Comparison of HIT and Mill & Fill (3m/min) ]
82.98
2.8213.97
6.05
179.47
9.58
58.81
11.15
0
20
40
60
80
100
120
140
160
180
200
CO HC Nox Sox
HIT
Mill & Fill
9353
13929
0
2000
4000
6000
8000
10000
12000
14000
CO2
Tota
l Gas
Em
issi
on (
%)
Reduction rate32.9%
Reduction rate53.8%
Reduction rate70.6%
Reduction rate76.2%
Reduction rate45.7%
3737
Total Energy ConsumptionTotal Energy Consumption
35
18
23
0 5 10 15 20 25 30 35 40
CoventionalMethod
ImmedieteTarget
Okinawa
(m-cal/m)
Reduction
34%
Reduction
47%
3838
EconomicsEconomics
HIT method Mill and FillLabor 224 270Material 2,688 3,802Operator 384 371On site heating 480 0Tuck coat 0 70Waste disposal 0 652Sub total 3,776 5,165Machine rental cost 1,270 535
Total 5,046 5,700
Unit: ¥1,000
3939Avenir
