Multifonctional behaviour of geo and bio-based building panels – PACS

Environmental issues in building sector are huge, particularly in the context of reducing greenhouse gas emissions. This concerns not only the construction phase, but also operation phase and end of life of buildings. Within this framework and following new RE2020 regulations, this project aims to investigate the multi-physical behaviour of raw earth building insulated with bio-based materials. PACS+ project will focus on different scientific issues: the in situ measurement (large scale) of thermal and hygric fields with non-destructive methods; a detailed understanding of hygric effects within porous materials with the help of modelling; the description of the coupled hygro-thermo-mechanical behaviour specifically at the interface between raw earth and bio-based materials; the evaluation of insulation effect on global performance from both energy and structural point of view. The originality of the current proposition is considering together the association of 2 materials –earth and bio-based insulating- and the relative effects between both. It is chosen to deal with the whole multi-physical effects that take place in such building panels. Another original point is to focus on real scale; the development of original non-destructive tools, at this scale, seems to be promising in the perspective of in situ diagnostic. That’s why, tools will be used on materials and panels at both scales for characterization, with a particular attention to the scale effects. On one hand, on a composite sample, the coupled hygro-thermo-mechanical behaviour will be characterized, interpreted and reproduced by suited models. On the other hand, on large scale panels, the influence of insulation on energy and structural performances will be evaluated both in transient phase and in steady state.