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