by Martijn on 27/08/2015 | Cultivation

Lime-Hemp Groningen promising for earthquake resistant building

EcoBouwSalland, HempFlax and Sanger IBCT are studying how home insulation based on a mixture of hemp and lime hemp behaves during earthquakes. This research is supported by the NAM (Dutch Petroleum Company). Earlier tests had shown that the product has a low modulus of elasticity. This means that it gives way, instead of tearing.


Earthquake_full

Groningen, The Netherlands – EcoBouwSalland, HempFlax and Sanger IBCT are studying how home insulation based on a mixture of hemp and lime hemp behaves during earthquakes. This research is supported by the NAM (Dutch Petroleum Company). Earlier tests had shown that the product has a low modulus of elasticity. This means that it gives way, instead of tearing.

The flexibility of lime is well known in the construction industry. And certainly in Groningen, where limestone mortar plays an essential role in the architecture the traditional barns, built from stone and mortar. These walls grow with time without dilatation. If crack appears, it most often closes in on itself under the influence of rain and humidity.

Lime-hemp insulation is made ??up of lime, hemp and pure natural additives. EcoBouwSalland used cementless hydrated lime that needs less heat during the production process than hydraulic lime, making it a more environmentally friendly alternative. The lime is mixed with hemp shives, manufactured by HempFlax in Oude Pekela, The Netherlands. The additive was developed by Wolf Jordan and consists of minerals that give the lime greater compressive strength, fast enough to ensure a short construction period.

In-situ processing for tightly sealed building

The lime hemp is delivered in bulk or in blocks. EcoBouwSalland Director Rens Borger is in favor of bulk, because if you mix and process the material in-situ as mortar, you can build tightly sealed buildings. “And breathable. And since it is also great heat insulator, you get a very energy efficient building.” Lime hemp is used in a monolithic timber frame, it is not bearing material. The plaster is also suitable as a natural finish.

Grants for research

NAM, Epi Kenniscentrum, the municipality of Loppersum and the Economic Board of Groningen are giving subsidies to further examine the product. This is related to its sound structural properties, but also to the fact that it is locally produced, and that it is easily processed by low-skilled workers. Borgers: “Lime-hemp is easy to handle, but you have to know what you’re doing. We therefore train people well before we put them to work.”

Source: cobouw.nl

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