Globally, there's a scarcity of sand. - Found: Hazelnut Shells Used for Construction Purposes
A groundbreaking concept has the potential to transform the construction sector and preserve the environment. Gabriele Götz, a 57-year-old building biologist and managing director of a brickworks with five employees, says, "We've been producing clay bricks for the seventh generation. I aimed to develop an eco-friendly building material with limited resources in mind."
Initial investigations with a coffee grinder
Following numerous trials, Götz discovered a promising alternative online: "I learned that fine particles of hazelnut shells could also replace sand." This revelation prompted her to initiate the first tests using a coffee grinder. Currently, she utilizes a chopper to crush the shells. "We no longer need sand with hazelnut shells," explains Götz. These hazelnut shells are employed not only in plaster but also in newly developed clay building boards, and they serve as fillers for cavity dry fill. Additionally, they're incorporated into clay screed. A 25 kg bag costs 15 euros.
To create the perfect hazelnut plaster, combine clay, water, and finely ground hazelnut shells with a stirring rod until the plaster reaches the desired consistency, enabling easy application with a trowel.
An abundant, recyclable raw material with impressive strength
The benefits of hazelnut shells: they're an abundant, recyclable resource boasting high compressive strength. Götz procures hazelnut shells from Frankengenuss, a company based in Cadolzburg that specializes in hazelnuts. She remarks, "We haven't felt the building crisis's impact. We've been using the renewable raw material hazelnut shells at various construction sites for over a year. We plan to expand and meet the growing demand. I'm also conducting further research, with coffee grounds synthesizing the next filler plaster in line."
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Source: symclub.org