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Exploring the effect of biopolymers in near-surface soils using xanthan gum–modified sand under shear

Chen, Chunhui ; Wu, Li ; Harbottle, Michael

Canadian geotechnical journal, 2020-08, Vol.57 (8), p.1109-1118 [Periódico revisado por pares]

1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: NRC Research Press

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Título:
Exploring the effect of biopolymers in near-surface soils using xanthan gum–modified sand under shear
Autor: Chen, Chunhui ; Wu, Li ; Harbottle, Michael
Assuntos: Analysis ; biopolymer ; Biopolymers ; biopolymère ; cisaillement direct ; Cycles ; direct shear ; Drying ; Effects ; Extracellular ; extracellular polymeric substances ; Grains ; Low concentrations ; Microorganisms ; Mucilage ; Mucilages ; Polysaccharides ; Protection ; sable ; Sand ; Sand & gravel ; Shear strength ; Soil ; Soil aggregates ; Soil moisture ; Soil structure ; Soil surfaces ; Soils ; substances polymères extracellulaires ; Vadose water ; Wetting ; Xanthan ; Xanthan gum
É parte de: Canadian geotechnical journal, 2020-08, Vol.57 (8), p.1109-1118
Descrição: Biopolymers produced in near-surface soils by living organisms, including microbial extracellular polymeric substances and plant mucilage, offer enhanced moisture retention and protection from dry environments, lubricate roots to allow penetration through soil, and link soil grains together physically to form soil aggregates. At the aggregate scale their effects and behaviour are known and significant, but their impact on geotechnical behaviour of shallow soil bodies at the mesoscale and beyond is largely unexplored, including their response to the moisture cycling typical in vadose zone soils. In this work we explore the effects of moisture conditions, including multiple dry–wet cycles, on the shear behaviour of sand amended with xanthan gum as a model biopolymer. Drying causes a significant improvement on shear strength, even at low concentrations of biopolymer, but this is largely lost upon wetting. The extent of shear strength improvement is dependent on the moisture path taken (i.e., the wetting–drying history) and deteriorates over a number of moisture cycles. We present a conceptual model that poses redistribution of the biopolymer around the sand grains as the cause of the observed behaviour and demonstrate that biopolymers can provide a significant although transient enhancement of shear strength of sand in near-surface conditions.
Editor: 1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: NRC Research Press
Idioma: Inglês

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Exploring the effect of biopolymers in near-surface soils using xanthan gum–modified sand under shear

Chen, Chunhui ; Wu, Li ; Harbottle, Michael

1840 Woodward Drive, Suite 1, Ottawa, ON K2C 0P7: NRC Research Press

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