Case studies of Advanced Construction and Demolition waste(CDW)
Recycling initiatives and technologies In JAPANAffiliation
Location
Position:
Name/SurnameTokyo Urban Planning and Development Corporation
Central Breakwater Inside landfill,3 Aoumi, Koto-ku TokyoManager Administration Section ,Construction Waste Soil Recycling
CenterAKIRA AMATSU

e-mailamatu01@toshizukuri.or.jp

Title

Tokyo Metropolitan Construction Waste Soil (Excavated soil)
Recycling Center Operation Management Project

Theme
classification

Technology
development stage〇〇

Prevention
Re-useRecycleReduce Co2Legacy
Business to overseas
Etc.
Practical use
Scheduled to be put into practical use by 2020
Scheduled to be put into practical use after 2020

Specific content- This center operates three functions of the information management
center, stockyard, and soil improvement plant in an integrated mannerin order to effectively promote the reuse of excavated soil generated
from public works in Tokyo.
Stockyard: Stock capacity: 90,000 m3,
Stock area: 2 ha
Soil Improvement Plant: Maximum 150 t/h x 2units
Annual soil production volume ofApproximately 300,000 m3

Appeal point- This center is the world's first site to integrally operate and manage
the functions of a stockyard, soil improvement plant, and information
management center of excavated soil.

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Earth-friendly Facility

Tokyo Urban Planning and Development Corporation

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Stand-by area

* Reception gate

* Site area: about 8ha

Ground Plan

Stockyard B

Stock
Stockyard
yard BB

Stockyard B
yard BStock
Car parkbuilding (2)Administration
center

Stock yard C

Parking
Lot

Administration Center

Chuo-bohatei-uchigawa-umetatechinai,
Chisaki, 3-chome, Aomi, Koto-ku, Tokyo[Purpose]
Reducing the quantity of disposable waste
soil generated by public works in Tokyo, while
reducing the quantity of mountain sand to becollected, thus, contributing to the creation ofa sound recycling society through therecycling of construction-generated soil[Service Details]
1. Accepting construction-generated waste soil andproviding regular soil
2. Raising the quality of construction-generated
waste soil and providing improved soil
3. Research on soil quality[Address]

Outline of the Tokyo Metropolitan
Construction Waste Soil Recycling Center

Stock yard A

This Center has three functions: as an information center,as a stock yard, and as a soil improvement plant. To
effectively recycle the soil generated at public works
Sites in Tokyo, these functions are integrally utilized.
This Center is under the Bureau of Urban Development of the Tokyo Metropolitan Government and isoperated/managed by the Tokyo New Town Development Corporation.

(4) Securing the entities/places that would
accept the soil
(5) Promoting the appropriate soilimprovement(1) Soil quantity(2) Control of soil quantity(3) Promoting recycling
As a way of concretely implementing the above
principles, the Tokyo Government established theTokyo Metropolitan Construction Waste Soil
Recycling Center in May 1992.

The Tokyo Metropolitan Government implements
measures on soil generated by construction
according to five (5) basic principles:Tokyo Metropolitan Government’s
Policy for Construction-generated Soil

Recycling of Soil Generated by Construction

Yard D for
soil
improvement

Car parkbuilding (1)Electrical
Room

Exit gate

Building for
Crushing,Cracking, &Mixing

Yard
D
Sorting of received soil by using a trommel<Processing capacity: about 400m3/day(for soil received by the Center)><Processing capacity: 150t/h (2 units), Annual output:300,000m3>

Yard
E Stand-by area

Yard D for
soil
improvement

ProductseparationbuildingYard D forsoilimprovement

Building for
Crushing,Cracking, &Mixing

Soil improvement

Improved soil yard E

Car wash<Temporary stock capacity: 90,000m3, Area: 2h>Soil Improvement Plant

Here, they adjust the sizes of grains of clay of waste soil which cannot berecycled as it is, then mix soil with unslaked lime to improve its quality to thesame level as that of mountain sand.

It serves as a storage facility wherein regular soil is temporarily placed, atemporary soil storage facility before treatment at the plant (Soil for Treatment
Yard), a drying facility for treating soil (Stock Yard A and B), and a storage for
improved soil (Improved Soil Yard).

Based on information from the Tokyo Government, it operates the stock yard
and the soil improvement plant, controls soil quantity, as well as coordinates theintegral functions of the Recycling Center, such as central monitoring devices,soil laboratory, etc. It also serves as a reception for ticketing and similar jobs.

Stock Yard A and B

Soil
Improvement
Plant

Stock Yard

Administration
Center-69-(50mmorLarge clod crusher

screenProduct separation vibrating screen

Unslaked lime bin

Cracking/crushing machineclod separation vibrating(35mm or bigger)

Cracking/crushing/Mixer
mixing machineMid-sized(100mm or bigger)

Further ion-exchange
reaction causes the soilgrains to become
stronger.

The lime remaining
after the ion-exchange
and pozzolanic
reactions solidifies byreacting with carbon
dioxide gas, andincreases its strength.

④

Carbonation reaction③

Pozzolanic reaction(Solidification)

Soil grains thatabsorbed calcium ions
get integrated.

Ion-exchange reaction(Aggregation)

Hydration reaction

Unslaked lime reacts w ith
w ater, and the w ater insoil becomes solid.
Thr ough the heatgener ated by thisprocess, the w ater
vaporizes. The
proportion of the w ater inthe soil is then r educ ed.

②①Waste soil from construction sites, mixed with unslaked lime using a cracking/crushing/mixing
machine, causes the following four chemical reactions, which then changes into dry soil that isstrong against pressure and difficult to crumble, thus being recycled as improved soil.

● Chemical Reaction and Effects of Mixing with Unslaked Lime

Improved soil yard

(13mm or smaller)(13mm or bigger)

Auxiliary
Auxiliarybigger)
Crusher
cracking/crushing/mixing machine(35mm orsmaller)(100mm or smaller)

Large clod separation
vibrating screen

Fixed quantity supplier(Receiving hopper for soil improvement)
Soil to be treated(Dumping grate)● Soil Improvement System Using Unslaked Lime

● Quality Standards of Improved Soil

Large clod
crusher 2

Large clod
crusher 1

Receivinghopper 1

Mid-sized clod separation
vibrating screen 1

Cracking/CrushingMachine 1

Product vibration
screen 1

Product vibration
screen 2

Improved soil 2

A certificate is issued upon request.

● Quality Certificate of Improved Soil

▾ Supervisory Control Room (for monitoring the soil improvement process) ▾▾ Soil Quality Testing Laboratory ▾1. Grain diameter: 13mm or less
2. CBR: 3% or more, 20% or less
(Each value of the quality control data tested 30 days before the shipment shall be 3%or more, and the mean value shall be 20% or less.)

The quality of the improved soil satisfies the standards of Type 2 Improved Soil stipulatedby the Construction Guidelines on Road Occupancy in Tokyo Metropolitan.1. Service Days & Related Information(1) Sending out of improved soil / receiving of waste soil
DaytimeNighttimeDays open

Monday - Saturday

Days closed

Sundays, holidays (including substitute holidays), August 12 - 16,
December 28 - January 4, and other days specially designated)

Service hours

8:30 - 17:00

22:00 - 5:00

(2) Processing of applications and issuance of tickets to use the facility
Days and TimeDays closed

Monday - Friday, 9:00 - 17:00
Saturdays, Sundays, holidays (including substitute holidays), August 12 - 16,
December 28 - January 4, and other days specially designated)

2. Construction Applicability and Criteria for Acceptance(1) Construction Applicability
Tokyo Government-related public works, located within the radius of 30km from the Recycling Center(In principle, the construction shall require bringing in the waste soil and taking out either ordinary soil
or Type 2 improved soil.)(2) Acceptance Criteria
1. Soil that does not contain toxic
substances (According to the criteria,
the “Certificate of Soil Test on Toxic
Substances” or the “Soil Test Report”
shall be required when submitting theapplication.)
2. Waste containing waste wood,asphalt, concrete blocks, metal, debris,etc. shall not be accepted.
3. Acceptable types of soil and classifications shall be according to the table on the left.
4. The soil shall not be of high water content and shall not discharge odor.
5. Soil from the construction sites of the areas designated by the Soil Contamination
Countermeasures Act and the Act on Special Measures for the Prevention of Dioxin, etc. must not beaccepted. (Please refer to the website of the Bureau of Environment, Tokyo MetropolitanGovernment.)
Acceptable Soil TypeSoil Classification
Type 1 Construction Waste SoilFine sand, sandy soil,
Type 2 Construction Waste Soilsilt and cohesive soil
Type 3 Construction Waste Soil
Type 3 Construction Waste Soil
Kanto loam
Type 4 Construction Waste Soil

* For details of the acceptance criteria, please refer to the Guidelines on the Use of the Center.

In the Recycling Center, we endeavored toprevent overloading by issuing the Manualon the Prevention of Overloading, as well as
to promote accident prevention and a safe
transport.

Weighing at the entrance gate

The quantity of soil to be carried in and out ismeasured and recorded by truck scales uponarrival and departure.

Exit gate-70-Construction Waste Soil Recycling System
Entities that directpublic works

Construction waste
soil recycling facilities

Exchange of information
Bureau headquarters ofTokyo Metropolitan
Government

Various offices ofTokyo Metropolitan
Government

Tokyo Metropolitan
Construction Waste Soil

Recycling Center

Bureau of Urban Development, Tokyo
Metropolitan Government

Decision-making of
public works that avail of theservices of the Recycling Center

23 Wards in Tokyo
Processing of service-users

Cities, Towns, andVillages in Tokyo

Waste soil
information system
Application/coordinationon the use of servicesThird sectors

Contractor of construction

Order to construct (Use of the Recycling Center)

View of the entire yard for soil improvement-71-Map featuring the area around Tokyo Metropolitan Construction Waste Soil Recycling Center

Arakawa
River

Tokyo Metropolitan Construction
Waste Soil Recycling CenterTokyo Metropolitan Construction
Waste Soil Recycling CenterTokyo
Port andHarbor
Area(present)

TokyoPortandHarbor
Area(plan)

Tokyo Bay

Source: Tokyo Metropolitan Government

Tokyo Urban Planning and Development Corporation
4-7-1 Koyasu-machi, Hachioji City, Tokyo 192-0904 Tel: 042-686-1613
URL:http://www.toshizukuri.or.jp/Tokyo Metropolitan Construction Waste Soil Recycling Center
Chuo-bohatei-uchigawa-umetatechinai, Chisaki, 3-chome, Aomi, Koto-ku, Tokyo 135-0065
Tel: 03-3520-0982 Fax: 03-3520-0827

This brochure is made of 100% recycled paper.
Prepared on August 2017-72-