Abstract
The aim of this study was to optimize the thermal performances of a bio-composite based on cereal straw and mineral binders. The purpose is to reduce its thermal conductivity by decreasing the amount of mineral binder while maintaining sufficient mechanical properties to ensure self-bearing. Three additives, namely hemoglobin, casein and gelatin, from a renewable and biodegradable biomass source were used. Thermal and mechanical characterization of the composites was carried out. The influence of the additives on the carbonation-hydration mechanisms, microstructure changes and macroscopic properties was investigated. The microstructure and the mineralogy of the binders without and with additives was investiagted through microstructural analysis (SEM, DRX and TGA). The optimized composites have an interesting thermal conductivity with acceptable mechanical properties for use in building insulation.
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