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The low mechanical strength of bio-aggregate-based concretes is mainly due to the high water absorption of hemp shives and the poor aggregate - mineral binder adhesion. A new way of approach to improve this interface is the use of a viscosity-modifying admixture (VMA). Four different mixes were made for: shuttered wall, external rendering, floor insulation and roof insulation. The setting up strategy enabled the elaboration of hemp concrete with improved mechanical properties due to an addition of 1% VMA in the binder. This VMA did not increase the thermal conductivity of the composite. The results also highlighted an increased efficiency of the viscosity with mixes containing a high hemp shiv / binder ratio.
Hemp concrete, Mechanical properties, Thermal conductivity, Vicosity-modifying admixture, Water absortion
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