September 2017 No.78

IDIJapanese Infrastructure Newsletter

QUARTERLY
Infrastructure

Development

Institute—JAPANCONTENTS
Stabilizer Construction Method2

１．Background of Technology Development

2

２．Detailed Description of the Technology
３．Advantage of the Technology
４．Applicability
５．Installation Record (Example of construction)

2

Infrastructure Development Institute – Japan (IDI)
Suido-cho Bldg, 3-1, Suido-cho, Shinjuku-ku, Tokyo, 162-0811, JAPAN
Tel: +81-3-5227-4107 Fax: +81-3-5227-4109 E-Mail: idi17@idi.or.jp Website: http://www.idi.or.jp/english/00index.htm

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Stabilizer Construction Method

1. Background of Technology Development
Around 1960, Stabilizing method usingmaterial, (3) construct new base courses usingasphalt emulsion for gravel road and soilroads by reclaiming the existing asphalt

stabilization using cement were widely applied

mixture and base course material.

existing

granularmaterial,(4)reconstructin Japan. Furthermore around 1980’s in –placebase course recycling method using stabilizer
had started and the stabilizing equipment(stabilizer:Photo1) had improved to use both ofasphalt and cement or lime.
At this moment, the stabilizer construction
method can be used to (1) stabilize and improve
weak sub-grade surface, (2) stabilize granular

Photo1 Road stabilizer PM-550

2. Detailed Description of the Technology
There are several types of stabilizations as following:
Subgradestabilization

In-placestabilization

In-place recycling ofbase course

Stabilization of new granularmaterial

Granular basestabilization

Figure1Stabilization of existing gravel
layer

Types of stabilizations

The features of this method are as following:layer, mixing them with added binding agents

1) In-place upgrading: improve soil roads,

at the same time, and place them back to thegravel roads to enhance their durability rightroad immediatelyon-site.

4) Cost saving by recycling material and2) Resource saving: by re-using existing

shortening construction time.

base-course material, asphalt mixture.

Mainly3) Fast construction in one running of the plantused( Figure2-4)

3typeofstabilizer

methodisby crushing base course materials and asphalt

Figure2 Improvement of subgrade

Figure3 Improvement of base course

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Figure4 In-place base course recycling
Specification of Road stabilizer PM550 is shown in Table1.
Table1 Specification of PM550

The detail of mixing rotor are shown in photo2,3.

Photo2 Rotor system(shift mechanism)

Photo3 Conical bits(inside rotor system)

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Typical machine fleet of in-place base course recycling is shown in Figure 5
In-place stabilization of recycling base course－Additive：Cement, Emulsified Asphalt
Spreadingof Cement

Supply of Emulsified
Asphalt

Pulverizing
and Mixing

Road Stabilizer

Asphalt tankVibrating Roller

In-place stabilization of recycling base course

Road Roller

Morter Grader

Tier Roller

Pavement of Surface course

Pavement of Hot Mix Asphalt

Seal coat（ Asphalt +Sand）

Dump TruckDistributor

Compaction

ShapingCompaction

Asphalt finisher

Road Roller

Tier Roller

Figure5 Typical Machine Fleet of In-place Base course Recycling

3. Advantage of the Technology
In many countries the traffic (cargo transport)materials of embankment or subgrade. → Saving

volume has been increasing more rapidly than the2) Increasing the bearing capacity of subgrade

road extension. There is concern that the traffic(CBR value of subgrade), decreasing the thickness

volume will increase and damage will be increasedof pavement structure. → Lower Cost

time and materials

accordingly. So the biggest problem is using budget

3) Make water-tight subgrade. → Durable

effectively for maintenance and new construction.

(2) Features of Base course stabilization

The consideration of long-life pavement (it is1)

Recycleofexistingbasecourse

called perpetual pavement in U.S.A) is necessary atmaterials/asphalt surface course →Environment

the process of pavement design and construction

Friendlyfor the effective infrastructure development.
Long-life pavement means the under-layer ofpavements (subgrade, subbase and base course) is
maintenance-free structure and only surface course(orbindercourse)

will

berepaired.

Roadstabilization method is useful technology to make2) Up-grading of existing roads in the case oftraffic increasing. →Durable structure3) Shortening construction period → Quickrehabilitation
4) Low-cost construction in comparison with full
replacement. →Lower cost

the pavement durable.
(1) Features of soil stabilization
1) Soil stabilization is the construction method toraise

strength(bearingcapacity)

forweak

4. Applicability
This technology is available for the stabilization ofsoil, granular materials and base course andasphalt pavements. Additive for stabilization are

September 2017 No.77
4cement (or lime) and /or asphalt emulsion. Theand prevent trouble at the construction site andreason of using asphalt emulsion is as follows.

easy to solve the problems. Asphalt emulsion is low

1) Safety reason

viscosity liquid, so the mixing of aggregate andAsphalt emulsion is cold materials, not hotasphalt is easy.

asphalt so if the worker contact the asphalt, there

3) Emulsion can be stored considerably long term.

are no possibility of getting burned.

If construction work stop, emulsion can be used on2) Less Troubles

next dayIn the case of using asphalt emulsion, simple
nozzle is available. Simple nozzle is less stuffed

5. Installation Record (Example of construction)(1) Soil road stabilization (Vietnam : cement)

Photo4 Before stabilization

Photo5 After stabilization(2) Gravel road stabilization (Nicaragua : cement)

Photo6 Before (gravel road)

Photo7 stabilization

Photo8 Completion (Block pavement)(3) In-place base course recycling (Vietnam: cement and asphalt emulsion)

Photo9 Before (Damaged road)

Photo10 stabilization

Photo11 Completion (Asphalt pavement)September 2017 No.77
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Technology developer: SAKAI HEAVY INDUSTRIES, LTD.
Contact : Hitoshi Fujita
E-mail hitoshi.fujita@sakainet.co.jp
URL http://www.sakainet.co.jp/TEL +81-3-3431-9971
FAX +81-3-3436-6212

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About IDI and IDI-quarterly
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association operating under the guidance of Ministry of Land, Infrastructure,
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