Abstract
Buildings account for a large share of the primary energy and materials use in Europe. Therefore, the EU has set several energy and materials targets for the built environment and other sectors. Novel low-carbon materials can play a major role in the transition towards meeting those targets. Moreover, agriculture produces by- or waste products that could be used as constituent of innovative agro-materials for construction. Recently, beet pulp based-material is being investigated on the material scale and promising results are pointed out regarding its interesting mechanical, hygrothermal and acoustical properties for building insulation use. In this context, the paper aims to study experimentally two types of beet-pulp starch composites: whole bricks and hollowed bricks. The manufacturing of the two types of bricks is detailed. A comparative study is then achieved regarding the drying kinetics, mechanical properties as well as internal structure composition.
Highlights
Over the last century, the extraction of building materials and fossil fuels has been multiplied by 34 and 12, respectively (CREE 2015)
The results showed that the freeze-dried bricks show the lowest shrinkage percentage and a more homogeneous surfaces on all brick sides as compared to other drying methods which resulted in more irregular brick shapes on which micro-cracks could be seen
This work deals with the experimental characterization of a new bio-sourced building insulation material based on starch and beet pulp
Summary
The extraction of building materials and fossil fuels has been multiplied by 34 and 12, respectively (CREE 2015). Concrete is the second most consumed material in the world after water. The sand, one of concrete constituent, is the second extracted mineral raw material with a shortage announced as the same level as fossil fuels with numerous environmental and socio-economic impacts. On the other hand, according to the last report of the World Meteorological Organization WMO The WMO report on greenhouse gas concentrations shows that 2015 – 2019 has seen a continued increase in carbon dioxide (CO2). Levels and other key greenhouse gases in the atmosphere to new records, with CO 2 growth rates nearly 20 % higher than the previous five years ((WMO) 2019). The worries about climate change consequences and the awareness of the mineral resources shortage have pushed several countries to put in place policies encouraging the deployment of a biosourced economy based on the extraction and exploitation of the biomass
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