Demo case : screed (‘sand cement’) built up by 100% recycled aggregates, Eco-binder (without cement) and natural fibers
In February 2021, Bioterra NV (member of Group De Cloedt), together with a few partners mentioned below, performed a demo in Maasmechelen (Belgium) in which a private house of 120m² was equipped with a screed based on 100% recycled aggregates (0 / 4mm), a carefully formulated eco-binder and vegetal fiber.
The recycled aggregates are recovered and reassembled by Bioterra through its recycling center in Genk (B).
The basis for these sustainable aggregates is diverse, but mostly composed of processed contaminated soils and mineral waste.
The eco-binder is made up of several components and has a 60% reduction in CO2 compared to traditional Portland cement. To prevent shrinkage, we have opted for a 100% vegetal fiber, which makes the applied mixture unique and extremely sustainable.
In order to test the demo as hard as possible in practice, we have chosen a professional with his standard equipment to make, pump and apply the mixture as he would with traditional screed (based on primary raw materials and cement).
The feedback from the professional was that he felt no difference with his usually applied mixture, which as user experience determines the actual applicability. This fact, coupled with the application via a pump truck, clears the way for a larger-scale application of this sustainable and high-quality recipe!
All measurements in terms of compressive and flexural strength show that the use of recycled content certainly does not result in lower quality, on the contrary!
The applied mixture has a slightly higher density than primary material, but this in turn would favor the heat transfer, so that the use of this durable screed could also be more energy-efficient.
To be continued!
For more info, visit www.bioterra.be