Evaluation of Hemp-Claycrete Properties

Abstract

This thesis aims to investigate the mechanical and thermal performances on a new low carbon footprint material named hemp-claycrete. Composites using hemp, clay and various additives are produced and the significance of hemp to binder ratio of the composites using two different sets of additives is studied. Densities decrease logarithmically with increasing hemp to binder ratio ranging from 0.3 to 1.37 g/cm3. Mechanical performances highly depend on the hemp to binder ratio. The flexural strength ranges up to 0.11 MPa and the compressive strength ranges from virtually 0 to 1.31 MPa, meeting requirements of the intended use. The thermal conductivity also strongly depends on the hemp to binder ratio and the resulting porosity. It is linearly decreasing with raising amount of hemp and ranging from 0.07 to 0.29 W/mK. The greatest impact on the environment is on account of the binder, more specifically its additives, and a reduction of the binder evidently ensures a benefit in sustainability. Fire resistance declines with rising hemp to binder ratio as the binder favours prolonged stability and firmness. More studies are needed to explore further performances such as strain, ductility and durability.