Building with dredge and a sustainable binder

For: Hoogheemraadschap Schieland en Krimpenerwaard, MIT Haalbaarheid, Duurzame Ondernemer Booster

With whom: With you? Do you move with us

Status: begonnen in oktober 2020

In the province of South Holland, every year 4 to 5 megatonnes of building materials are needed. There are currently few options for sustainable paving available. The water passing dredge tile that Waterweg makes is a product in which a waste flow and sustainable binder are combined into a scalable product for the construction sector. In this feasibility study, we want to answer questions about the economic, technical, and ecological feasibility of the use of geopolymers in this tile.


Waterweg wants to investigate the use of geopolymers in water passing paving of made from dredged sediments. A geopolymer is an activated alkaline aluminum silicate, a durable replacement for cement as a binder. A geopolymer can be produced from various residual flows by chemical processing of the material. In addition to a significant reduction in emissions due to the use of dredging, the stone will be completely reusable.

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Product design

For: Stimuleringsfonds voor de creatieve industrie

With whom: sparringpartners Catelijne van Middelkoop & Tessa Geuze

Status: begonnen in oktober 2020

In the coming months, our designer Wies van Lieshout will devote herself to the design of products made from dredge thanks to the support of the Stimuleringsfonds. Besides, focusing on technical development, we can take steps in the design of our product. We believe in the power of design and that there is a lot to be gained in the dredging and construction industry with regard to design. With the contribution of the Stimuleringsfonds, we can make the circular economy, more beautiful!

Certification of the leveling tile

For: Province of South Holland

With whom: With you? Do you move with us

Status: started in october 2020

We are currently working on the upscaling of our production process. We want to move beyond lab tests towards making a greater impact by working together with different partners. Nonetheless, it is important that our product is fully certified to be able to sell our tiles on a large scale. The province Zuid-Holland and affiliated ministries can be a partner in the certification of the product, but may also be the launching customer of dredged paving.

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Upscaling of the production process

For: CityLab010

With whom: Municipality of Rotterdam and Nefrex

Status: Completion at the end of 2020

In this project for the municipality of Rotterdam, we process 15,000 kilos of dredged sediments into pavement for the city of Rotterdam. This is the first major production in collaboration with a factory and contractor. We learn about the upscaling of the production process and all relevant chain partners. In addition, we will actively engage in discussions with local residents to involve them in a climate-adaptive and circular living environment. You can read more about this project here. 


The first water passing pavement

For: the Water Authority of Delfland & Unie van Waterschappen

With whom: The Green Village and VP Delta

Status: Completed

The first tiled path made of dredged material has been opened on Waterstraat in Delft in October 2019. We made this product with our own hands with sludge from Delfland. We placed the stones at The Green Village in Delft where we were able to do different tests. The tests are still being monitored at the moment. You can read more here.


A feasibility study

For: the Water Authority of Delfland

Status: Completed

The first study we did after winning the BlueCity Circular Challenge was a feasibility study. Here, with the support of the Waterschap Delfland, we investigated the technical and economic feasibility of water passing paving of dredging tiles.


BlueCity Circular Challenge

For: BlueCity

With whom: Wies van Lieshout, Simon Schilt, Tessa Luijben & Eva Aarts

Status: Completed

Waterweg started after winning a design competition. We had to go from a waste stream to a revenue model in six weeks. In the BlueCity CircularChallenge, we were assigned the waste flow of dredged sediment from the Waterschap Delfland. We developed our first prototype of this waste stream: the water passing dredge tile. There the idea of Waterschap was born.