Shear strength behavior and parameters of microbial gellan gum-treated soils: from sand to clay

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Microbial biopolymers have recently been introduced as a new material for soil treatment and improvement. Biopolymers provide significant strengthening to soil, even in small quantities (i.e., at 1/10th or less of the required amount of conventional binders, such as cement). In particular, thermo-gelating biopolymers, including agar gum, gellan gum, and xanthan gum, are known to strengthen soils noticeably, even under water-saturated conditions. However, an explicitly detailed examination of the microscopic interactions and strengthening characteristics between gellan gum and soil particles has not yet been performed. In this study, a series of laboratory experiments were performed to evaluate the effect of soil–gellan gum interactions on the strengthening behavior of gellan gum-treated soil mixtures (from sand to clay). The experimental results showed that the strengths of sand–clay mixtures were effectively increased by gellan gum treatment over those of pure sand or clay. The strengthening behavior is attributed to the conglomeration of fine particles as well as to the interconnection of fine and coarse particles, by gellan gum. Gellan gum treatment significantly improved not only inter-particle cohesion but also the friction angle of clay-containing soils.
Publisher
SPRINGER HEIDELBERG
Issue Date
2019-04
Language
English
Article Type
Article
Citation

ACTA GEOTECHNICA, v.14, no.2, pp.361 - 375

ISSN
1861-1125
DOI
10.1007/s11440-018-0641-x
URI
http://hdl.handle.net/10203/261820
Appears in Collection
CE-Journal Papers(저널논문)
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