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
Super Sol
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

Chemical conpositionContent (wt%)
SiO2 Silicon dioxide
CaO Calcium oxide
Na2O Sodium oxide
Al2O3Aluminum oxide
K2O Potassium oxide
MgO Magnesium oxide

Design constant

Dry density
Design constantRolling pressure number of 30 cm thicker
Wet density
Angle of internal friction
Permissible support force
10 ton wetland bulldozer
(times / layer)
1 ton class vibration roller
(times / layer)
0.250.4025 3900
0.300.45 309824
0.350.55 3748
0.400.60 1768-

Single bodyCompacted
Dry density (ton/m3) From 0.4 to 0.5Density (ton/m3)From 0.3 to 0.4
Particle size distribution range (mm)From 2 to 75Triaxial compression strength
(Angle of internal friction)
More than Φ30°
Water content ratio (wt%)0Permeability coefficient of water (cm/s)From 3 x 100 to 1 x 10-2
Uniaxial compressive strength (kgf/cm2)From 30 to 40
Hazardous substanceNo water elution

Characteristics by type

Characteristic Uses
L10.3 - 0.6More 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
L20.4 - 0.5Less 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
L30.5 - 1.0Less than 10
Closed-cell lightweight material
GardeningMaterials for cultivation
L41.0 - 1.6Less 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.。
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.