ICNF 2021 - 5th International Conference on Natural Fibers
Recent advances on the multiscale uses of vegetal biomass in the building material construction industry
Institut Pascal, Université Cermont Auvergne/CNRS/Clermont-Ferrand, France
Professor Sofiane Amziane, RILEM Fellow is currently coordinator of the Innovative Materials theme at the Institut Pascal - UMR 6602 at University Clermont Auvergne (Clermont Ferrand, France). He is the current head of the CNRS National Group of Research (Biobased Building Materials), which brings together 160 researchers in France. He has been the supervisor (or co-supervisor) of 22 PhD students He has coordinated several national (ECOGRAFI, AGROBETON 1 and 2), international RILEM (TC BBM 2011/2016 and HDB 2016-2021) and industrial projects. He is the Chair of the ICBBM Conferences series.
He is Editor of Academic Journal of Cicil Engineering, Associate Edito of European Journal of Environnemental and Civil Engineering He has been Visiting/Invited Professor to number of universities in Europe and several countries of Africa, Asia, North and South America.
He has over 85 peer reviewed articles in journals and 150 conference proceedings indexed in the Scopus data base, a Scopus H-index of 33, and over 3100 citations on the google scholar platform.
Sustainable development is a multi scale global issue in the sense that it integrates the contexts of both global warming and the progressive depletion of resources. These two elements constitute points of no return for our civilization. The building sector has a key role in greenhouse gas emissions: more than 30% of final energy consumption and 20% of global emissions are related to the real estate sector, and these figures will continue to increase if no measures are put in place.
Currently, on a global scale, the construction sector consumes more mineral matter than other industrial sectors, including energy production. In addition, the massive use of cement for building construction is responsible for 5% of global CO2 emissions.
The integration of bio-based building materials is one of the best alternatives to limit these negative impacts. In addition to the use of wood for building frames or walls, which provides the basis for many construction solutions which are often based on ancestral and universal know-how, the introduction of vegetal at the scale of ashes, aggregate or into construction products can lead to the development of innovative construction solutions with unusual properties of use.
At the scale of ashes, approximately 140 billion metric tons of biomass is produced every year in the world from agriculture. The ashes resulting from burning these agricultural co-products such as rice husk, bagasse, miscanthus, bambou and others can be used as Supplementary Cementitious Materials (SCM).
At the scale of aggregate, many mixes of concrete were designed in order to provide a high performance insulation solution using high volume (until 80% of the total) of various sources of bio-aggregates, such as wood, hemp, coconut, sisal, palm, bamboo, or bagasse, etc.
At the scale of fibbers, many examples shows that the introduction of natural fibbers are already used in cementitious materials to improve the flexural strength and post-cracking behavior. The most commonly used in cementitious composites are flax fibbers, diss fibbers and hemp fibbers. Several works aimed at characterizing the behaviour of these reinforced concretes.
The Keynote proposes to show an overview of the uses of the vegetal at the different scales. A large part of the results are issued from the outputs of the Technical Committee of RILEM on biobased building materials.