expanded glass gravel


Climate change is leading to changes in precipitation patterns, with more frequent and intense rain showers as one of the possible impacts. This can cause problems, particularly in urban areas, as sealed surfaces such as streets and buildings impede natural water drainage. To deal with these challenges, many municipalities, federal states and water associations are implementing measures for sustainable stormwater management.

We support this task of creating a waterproof living environment through individual water storage systems and with the installation of GEOMATERIALS RED expanded glass gravel.

A unique water-storing construction that not only retains rainwater, but also forms the stable base for a foundation. In this way, a parking lot, a street, a residential area or an event area can retain its function. The new individual system also offers innovative support in problem areas, such as regions sensitive to settlement.

  • our network and how everything started

    By sharing product knowledge and experience, the network around the innovative water storage system emerged from an enthusiastic collaboration between expert manufacturers, planners and project consultants. Our team consists of various competencies in the field of hydraulic engineering, manufacturing technology, dimensioning and planning implementation. Together we are able to develop a tailor-made solution anywhere in Germany.

  • our system and the application areas

    The water storage system works anywhere in public spaces where there must be a foundation under the flooring. However, every surface is different. That's why we deliver a tailor-made system that is specifically tailored to the respective environment by carefully recording the requirements together with our customers on the basis of a feasibility study.

  • our approach

    In addition to the required water storage capacity, we first look at the given structural properties of the foundation, how the system works and the management and maintenance options. The aim here is to minimize maintenance costs in the long term and to ensure stable functionality.

    Our priority is to develop a design that is suitable for local infiltration as well as delayed drainage or a combination of these options. It is important that the system fits the management and maintenance options of the regional conditions. Together with our clients, we develop tailor-made water storage systems.

  • our goal

    We are trying to create a foundation for infrastructure to enable more efficient use of rainwater. This may include expanding drainage systems and integrating stormwater management into plans.

    The implementation of such measures is not only important for protection against floods, but also contributes to adaptation to the challenges of climate change. Climate- and water-proof design of the living space is crucial in order to strengthen the resilience of communities to the effects of the changing climate in the long term.

Areas of application

GEOMATERIALS RED expanded glass gravel
application area: stabilization of traffic routes

GEOMATERIALS RED expanded glass gravel is a lightweight construction material that can absorb high dynamic loads, significantly reducing settlement. It is the base for every foundation, especially in regions with areas with low load-bearing capacity.

GEOMATERIALS RED expanded glass gravel
application area: water storage systems

GEOMATERIALS RED expanded glass gravel is a unique lightweight bulk material that has water-retaining and water-regulating properties and is therefore ideally suited as a system component in the construction of water storage systems. 

Example application area for water storage system

The municipality of Schiedam (NL) planned to use a new lightweight filling material GEOMATERIALS RED expanded glass gravel in the Ambachtenbuurt district.

This was a slight elevation under the road and sidewalk. The big advantage of GEOMATERIALS RED expanded glass gravel was that less rapid settlement is expected in the area, so that a later renovation process can be reduced, which should lead to lower maintenance costs. In addition to the fact that this material has a low specific gravity, there is a void of approximately 30 to 35% in the structure. The GEOMATERIALS RED expanded glass gravel also has the property of being able to absorb approx. 50% water by mass.

Based on these properties, it should be possible to add a climate adaptive function to this structure in the form of temporary rainwater buffering. Since water buffering in combination with GEOMATERIALS RED expanded glass gravel has not yet been used on a large scale, a test was carried out on January 16, 2020 to determine the filling and emptying behavior of this water buffer layer. To carry out this test, the municipality of Schiedam built a test track on Waterstokerstraat at number 15.

Based on the research carried out, the following conclusions were drawn.

The material GEOMATERIALS RED expanded glass gravel has sufficient absorption capacity to quickly store rainwater.

Production of GEOMATERIALS RED expanded glass gravel

raw material - used glass

GEOMATERIALS RED expanded glass gravel is made from 100% recycled glass. This means that valuable raw materials are reused and the energy initially required for the glass manufacturing process is saved.

the manufacturing process

In an innovatively developed expanding process, a newly structured expanded glass gravel is created in state-of-the-art continuous furnaces at a modified sintering temperature. The manufacturing process makes it possible to use GEOMATERIALS RED expanded glass gravel its technical parameters must be adapted so that it meets the high demands of traffic loads and water storage systems.

the result

During production, oxygen is created during combustion with the addition of certain additives.
This expands the material into a rod-shaped cell pattern and forms a scaffold-like cell structure with cavities in the individual grains.

Possibilities for delivery

Delivery of bulk material with a walking floor truck

This form of delivery is suitable for construction sites, which can be easily reached. A walking floor truck cannot tilt, but rather shuffles the material with its moving floor from back to front.

Typical dimensions: LxWxH = 18 x 4 x 2,8 m
Loading capacity: 85 - 95 m³ depending on type of truck
Non steerable axles!

Delivery of bulk material with a container truck

This form of delivery is suitable for narrow access roads. The bulk material is divided into the towing vehicle and a
trailer. Therefore the material can be brought step by step. Please mind: through the minimized quantity and the additional expense, we charge an extra container surcharge.

Typical dimensions towing vehicle: LxWxH = 9 x 4 x 2,8 m
Loading capacity: 76 - 80 m³ depending on type of truck

Reference Projects

  • Straßensanierung
    Alphen aan den RIJN

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