About us

Let’s stabilize the earth

GeoCrete® was developed by TIMAB Magnesium, part of the Roullier Group based in France. Since 1959, Groupe Roullier’s teams have been meeting the needs of the industry sector. Our constant drive to innovate finds the perfect balance between historical knowledge and technological and scientific developments.

With GeoCrete®, unnecessary excavation and transport are avoided and infrastructures can be constructed sustainably with less use of primary raw materials, lower CO2 emissions and more efficient use of concrete and asphalt.

Applications include roads, paved surfaces, foundations, dyke revetments and erosion protection. Based on our expertise, we want to contribute to new applications, the construction of safe roads, increased security against flooding and more sustainable structures.

These are the applications for which we developed GeoCrete®. An innovative stabilisation technique that is faster, cheaper and better for the environment compared to traditional foundations and paved surfaces. It helps create a stable foundation with a better force distribution that is less sensitive to vibrations and moisture balance. This increases sustainability and leads to lower costs when constructing and maintaining structures.

The soft soil or existing clay is transformed into a structural material with high-quality material properties. For example, a higher compressive strength and elasticity than the very low traditional stabilisations with lime and a lower strength than concrete, so that a reusable structure can be created using less energy.

The transformation of existing materials means the use of fewer primary raw construction materials and a more stable subsoil with a good force distribution. This significantly increases the sustainability of structures.


Patented cement additive for stabilisation

GeoCrete® is a patented cement additive that is used to treat soil. This mineral product is produced by TIMAB Magnesium. GeoCrete® neutralises acids in the soil and facilitates cement hydration processes. The structural changes and the formation of new minerals during cement hydration significantly improve the compressive strength, static and dynamic elasticity modulus, bending tensile strength and frost-resistance of the soil. In this way, specific soils, such as clay, soft soil or soil that is contaminated with metals, can be transformed into a stable surface.


Paved surfaces, roads and road widenings can be constructed more intelligently with GeoCrete®. Because with GeoCrete®, the process of structural stabilisation costs much less time. In fact, it is four to five times faster than the traditional method. A one-kilometre road with a single lane can easily be stabilised in just one day. Inside and outside the Netherlands, this innovative method is used successfully for paved surfaces that bear heavy loads. Read more about roads with GeoCrete®.


GeoCrete® offers various solutions to combat failure mechanisms in dikes. A large number of dyke projects have been implemented in which GeoCrete® has proven its worth. Among other things, the structure is not affected by corrosive seawater and years of experience have been gained with structures.

As a foundation under roads and in the flooding protection programme, structural stabilisation with GeoCrete® is a smart solution for multiple applications. Read more about dikes with GeoCrete®.


With GeoCrete®, very sustainable foundations can be created using the available soil. The cement additive increases the tensile strength and elasticity of a cement-based stabilisation. The surface of the foundation has a high bearing strength and a better distribution of forces towards the subsoil.

It reduces the need for transport, C02 emissions and the use of primary raw construction materials.

Read more about foundations with GeoCrete®. Contact us for help with your project!


At locations that are contaminated due to past or present industrial activities, such as the mining industry, GeoCrete® can be used to immobilise heavy metals. By neutralising or bonding compounds, further pollution of the soil or groundwater can be halted and further leaching can be prevented. This process requires specialist research.


“Our goal as market leader with the sale of minerals for customer-specific solutions is to contribute to a more sustainable world.  An example of this is the application of GeoCrete to build infrastructures with the existing land more cheaply and sustainably. Also the dissolution of pollution by metals is part of this.

Together with the Industry of binders, we want to set the standard with structural stabilization for stable reusable foundations for more durable constructions with lower costs. Unpaved roads permanently harden and make the soil available.


In the late 1990s, Van Mannekus developed the product GeoCrete®. Van Mannekus & Co is a joint venture between Grecian Magnesite and TIMAB Magnesium. Van Mannekus processes and distributes magnesium oxide, magnesium hydroxide and other magnesium compounds for many different applications in industry in general, and in the chemical industry, the environment and the agriculture sector in particular.

We started to develop this product when our team decided to use its knowledge to improve the range of products in the construction business. Based on more than a century of experience in the mineral market, our team has created a unique mix of minerals that can be used as a cement additive for the stabilisation process for specific soil types. The mix soon produced great results and the GeoCrete® concept was born.

Over the past 15 years, the GeoCrete® concept has been applied in various projects around the world. This has been determined from the preliminary investigation of the soil to determine the most optimal collection.

As of 1 July 2018 GeoCrete® is a brand of TIMAB Magnesium where our services are improved. Market Development Managers are close to our customers. Together with the binder industry we are working on new products, such as for high-quality stabilization.

Various stabilization companies and engineering firms are our partners.

We invite governments and clients to use TIMAB Magnesium to make the existing soil applicable to reduce costs in the construction and maintenance of roads and constructions.

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