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Earth as construction material in the circular economy context: practitioner perspectives on barriers to overcome.

Authors
  • Morel, Jean-Claude1
  • Charef, Rabia2
  • Hamard, Erwan3
  • Fabbri, Antonin1
  • Beckett, Chris4
  • Bui, Quoc-Bao5
  • 1 Laboratoire de Tribologie et Dynamiques des Systèmes, ENTPE, Vaulx en Velin, France. , (France)
  • 2 Faculty of Engineering and Computing, Coventry University, Coventry, UK.
  • 3 Laboratoire Granulats et Procédés d'Elaboration des Matériaux, Université Gustave Eiffel, Bouguenais, France. , (France)
  • 4 Institute of Infrastructure and Environment, School of Engineering, The University of Edinburgh, Edinburgh, UK.
  • 5 Sustainable Developments in Civil Engineering Research Group, Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam.
Type
Published Article
Journal
Philosophical Transactions of The Royal Society B Biological Sciences
Publisher
The Royal Society
Publication Date
Sep 27, 2021
Volume
376
Issue
1834
Pages
20200182–20200182
Identifiers
DOI: 10.1098/rstb.2020.0182
PMID: 34365821
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The need for a vast quantity of new buildings to address the increase in population and living standards is opposed to the need for tackling global warming and the decline in biodiversity. To overcome this twofold challenge, there is a need to move towards a more circular economy by widely using a combination of alternative low-carbon construction materials, alternative technologies and practices. Soils or earth were widely used by builders before World War II, as a primary resource to manufacture materials and structures of vernacular architecture. Centuries of empirical practices have led to a variety of techniques to implement earth, known as rammed earth, cob and adobe masonry among others. Earth refers to local soil with a variable composition but at least containing a small percentage of clay that would simply solidify by drying without any baking. This paper discusses why and how earth naturally embeds high-tech properties for sustainable construction. Then the potential of earth to contribute to addressing the global challenge of modern architecture and the need to re-think building practices is also explored. The current obstacles against the development of earthen architecture are examined through a survey of current earth building practitioners in Western Europe. A literature review revealed that, surprisingly, only technical barriers are being addressed by the scientific community; two-thirds of the actual barriers identified by the interviewees are not within the technical field and are almost entirely neglected in the scientific literature, which may explain why earthen architecture is still a niche market despite embodying all the attributes of the best construction material to tackle the current climate and economic crisis. This article is part of the theme issue 'The role of soils in delivering Nature's Contributions to People'.

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