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Stabilisation of Soft Clay, Quick Clay and Peat by Industrial By-Products and Biochars

Authors :
Solve Hov
Priscilla Paniagua
Christian Sætre
Mike Long
Gerard Cornelissen
Stefan Ritter
Source :
Applied Sciences, Vol 13, Iss 16, p 9048 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The stabilisation of soft soils using the traditional binders cement and quicklime are known to emit large amounts of carbon dioxide. To reduce this carbon footprint, substitutes such as industrial by-products have been thoroughly tested as viable alternatives for soil stabilisation. However, recent research has also shown that biochar from biomass pyrolysis can in some instances have a positive stabilisation effect and even result in a carbon-negative footprint. This paper presents a laboratory study to investigate the stabilisation effect of five industrial by-products and four types of biochar on three natural Norwegian soils: two clays with low and high water contents and one peat with a very high water content. The soils and binders were characterised by their mineralogical and chemical compositions. The biochars had varying stabilisation effects on the clays when combined with cement, with some negative stabilisation effects, whilst the effect was very beneficial in the peat, with a strength increase of up to 80%. The industrial by-products showed opposite results, with beneficial effects in the clays and a strength increase of up to 150%, but negative stabilisation effects in the peat. Correlating the mineralogical and chemical compositions to stabilisation effects was found to be challenging.

Details

Language :
English
ISSN :
20763417
Volume :
13
Issue :
16
Database :
Directory of Open Access Journals
Journal :
Applied Sciences
Publication Type :
Academic Journal
Accession number :
edsdoj.4e94bb134fc44fe0b1db71c60ff62fe1
Document Type :
article
Full Text :
https://doi.org/10.3390/app13169048