OGSIC, Glass recycling plant

Glass Recycling Plant

Since October, 2013, we are producing lightweight aggregate "Foamed Glass" using waste glass as raw material. Our company accepts glass bottles from private treatment companies and local governments as well. We are accepting about 10 tons a month from Okawa city of local government.

What is "Foamed Glass"

Physical properties

Several examples of civil engineering construction

Example of Japanese garden using together "Hirokawa-Aoishi"

What is "Foamed Glass"

From natural minerals to glass ---- Reduction from glass to nature
Inorganic materials with many characteristics

Inorganic mineral	Glass is the same as soil composition
Porous	There are numerous large and small bubbles
Earth friendly	99% waste glass is the raw material
lightweight	Can control the specific gravity

The raw material of glass is quartz, sodium carbonate, limestone and other natural minerals. It was used for various purposes such as a large glass bottle, a small multicolored bottle, a window glass of a building, and so on. And someday it will be used ...

We changed the shape of the used glass to a new shape called lightweight aggregate. Various effects have been confirmed in various fields, and it is attracting attention as an eco material without load on the environment. "Foamed Glass" will be useful in the future, and in harmony with the natural world, it will fulfill its role well. At the glass recycling plant, we are producing "Foamed Glass" such as" Formed-G^®", "Super-Sol^®" and "Porous-Alpha^®".

Physical Properties of the "Foamed Glass (Super-Sol^®)"

Chemical conposition

Content (wt%)

SiO₂	Silicon dioxide

73.5

CaO	Calcium oxide

12.1

Na₂O	Sodium oxide

10.5

Al₂O₃

Aluminum oxide

1.57

K₂O	Potassium oxide

0.98

MgO	Magnesium oxide

0.42

Design constant

Dry density iton/m³ j	Design constant			Rolling pressure number of 30 cm thicker

Dry density iton/m³ j	Wet density iton/m³ j	Angle of internal friction (°)	Permissible support force ikN/m² j	10 ton wetland bulldozer (times / layer)	1 ton class vibration roller (times / layer)
0.25	0.40	25	39	0	0
0.30	0.45	30	98	2	4
0.35	0.55		37	4	8
0.40	0.60		176	8	-

Single body		Compacted

Dry density (ton/m³)	From 0.4 to 0.5	Density (ton/m³)	From 0.3 to 0.4
Particle size distribution range (mm)	From 2 to 75	Triaxial compression strength (Angle of internal friction)	More than 30°
Water content ratio (wt%)	0	Permeability coefficient of water (cm/s)	From 3 x 10⁰ to 1 x 10^-2
Uniaxial compressive strength (kgf/cm²)	From 30 to 40
Hazardous substance	No water elution

Characteristics by type

Type

Dry
specific
gravity

Water
absorption
(wt%)

Characteristic

Uses

0.3 - 0.6

More than 30

High water retention capacity

Continuous bubble type ultralight material

Greening	:	Lightweight soil
Landscaping	:	Soil conditioner
Agriculture	:	Soil conditioner
Gardening	:	Bottom rock and modification material

0.4 - 0.5

Less than 30

Closed-cell ultra lightweight material

Civil engineering	:	Lightweight embankment material Protective material to be put in the back of retaining wall Lightweight mixed soil
Agriculture	:	Underdrain material

0.5 - 1.0

Less than 10

Closed-cell lightweight material

Gardening

Materials for cultivation

1.0 - 1.6

Less than 5

Closed-cell lightweight material
which is slightly heavier than water

Water quality	:	Filter material
For aquarium	:	Filter material
Civil engineering	:	Lightweight embankment material on the waterfront

Several examples of civil engineering construction

(Source: Glass Foam Business Cooperative)

Management road construction
(Nikko-city, Tochigi, JAPAN)
Construction Order Organization:
Kanto Regional Development Bureau

Sectional figure

Under construction

Construction finished

	It was adopted as the back filling material of road construction for dam management.
	Since there was an existing retaining wall under the construction site, they used a Super-Sol to reduce the pressure of the soil.
	Because of steep slope, embankment with good drainage was sought.

Quay improvement work
(Nago-City, Okinawa, JAPAN)
Construction Order Organization:
Okinawa Prefecture

Sectional figure

Under construction

Construction finished

	In revetment construction, super-sol L4 with a specific gravity of 1.1 which is lighter than gravel or crushed stone but sinks in water, they was adopted.
	Initially lightweight soil sinking into water was designed. However, the super-sol which was compacted easily and whose material was difficult to change was adopted.

Construction work of residential complex
(Sakura-City, Tochigi, JAPAN)
Construction Order Organization:
Private enterprises

Sectional figure

Under construction

Construction finished

	There was an existing buried pipe beneath the planned road. B
	Compared with the construction of replacement of the buried pipe, the construction method of protecting the buried pipe with a lightweight material has the merit of cost.
	As a result of comparative study with other lightweight materials (specific gravity of 1.0 or more), a supersol having the smallest replacement depth was adopted.

Example of Japanese garden using "Hirokawa-Aoishi (light-green stone)" and "Foamed Glass (Foamed-G^®)"

Laying thickness of "Foamed-G^®": Approximately 10cm

Ohtsubo GSI Co., Ltd.