Binder Formulation and Properties of Hemp Concrete

The building sector is one of the largest consumers of energy and emitters of greenhouse gases (GHG). The problems linked to climate change push us to design buildings that are more respectful of the environment, whether during the design stage, the life span, or the end of life of the works. The question then arises as to the use of insulating materials of petrochemical and mineral origin, non-renewable. To fight against environmental problems, it is thus necessary to develop new materials that are more eco-responsible and have less impact on the environment. In this sense, hemp concrete is of great interest in the scientific literature. The objective of this research is to determine the feasibility of designing hemp concrete by limiting the addition of hydraulic binder, not available in Canada which promotes GHG emissions (because of transportation) and adding materials available in North America. By combining it with other structural materials, such as OSB, it could replace gypsum board, which is widely used in Canada but often buried instead of recycled. This work will focus on the thermal and hydric properties of hemp concrete developed with metakaolin, to substitute hydraulic lime.